wtm-20210930
000077686712/312021Q3false182371348202418237124820243.232.73.235.000007768672021-01-012021-09-30xbrli:shares00007768672021-11-05iso4217:USD0000776867wtm:HgGlobalBamMember2021-09-300000776867wtm:HgGlobalBamMember2020-12-310000776867wtm:ArkInsuranceHoldingsLimitedMember2021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMember2020-12-310000776867wtm:NSMInsuranceGroupMember2021-09-300000776867wtm:NSMInsuranceGroupMember2020-12-310000776867wtm:KuduInvestmentManagementLLCMember2021-09-300000776867wtm:KuduInvestmentManagementLLCMember2020-12-310000776867wtm:OtherEntityMember2021-09-300000776867wtm:OtherEntityMember2020-12-3100007768672021-09-3000007768672020-12-31iso4217:USDxbrli:shares0000776867wtm:HgGlobalBamMember2021-07-012021-09-300000776867wtm:HgGlobalBamMember2020-07-012020-09-300000776867wtm:HgGlobalBamMember2021-01-012021-09-300000776867wtm:HgGlobalBamMember2020-01-012020-09-300000776867wtm:ArkInsuranceHoldingsLimitedMember2021-07-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMember2020-07-012020-09-300000776867wtm:ArkInsuranceHoldingsLimitedMember2021-01-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMember2020-01-012020-09-300000776867wtm:NSMInsuranceGroupMember2021-07-012021-09-300000776867wtm:NSMInsuranceGroupMember2020-07-012020-09-300000776867wtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867wtm:NSMInsuranceGroupMember2020-01-012020-09-300000776867wtm:KuduInvestmentManagementLLCMember2021-07-012021-09-300000776867wtm:KuduInvestmentManagementLLCMember2020-07-012020-09-300000776867wtm:KuduInvestmentManagementLLCMember2021-01-012021-09-300000776867wtm:KuduInvestmentManagementLLCMember2020-01-012020-09-300000776867wtm:OtherEntityMember2021-07-012021-09-300000776867wtm:OtherEntityMember2020-07-012020-09-300000776867wtm:OtherEntityMember2021-01-012021-09-300000776867wtm:OtherEntityMember2020-01-012020-09-300000776867wtm:MediaAlphaMemberwtm:OtherEntityMember2021-07-012021-09-300000776867wtm:MediaAlphaMemberwtm:OtherEntityMember2020-07-012020-09-300000776867wtm:MediaAlphaMemberwtm:OtherEntityMember2021-01-012021-09-300000776867wtm:MediaAlphaMemberwtm:OtherEntityMember2020-01-012020-09-3000007768672021-07-012021-09-3000007768672020-07-012020-09-3000007768672020-01-012020-09-300000776867us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2021-06-300000776867us-gaap:RetainedEarningsMember2021-06-300000776867us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-06-300000776867us-gaap:ParentMember2021-06-300000776867us-gaap:NoncontrollingInterestMember2021-06-300000776867wtm:TotalEquityIncludesNoncontrollingInterestMember2021-06-300000776867us-gaap:RetainedEarningsMember2021-07-012021-09-300000776867us-gaap:ParentMember2021-07-012021-09-300000776867us-gaap:NoncontrollingInterestMember2021-07-012021-09-300000776867wtm:TotalEquityIncludesNoncontrollingInterestMember2021-07-012021-09-300000776867us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-07-012021-09-300000776867us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2021-07-012021-09-300000776867wtm:BamMemberus-gaap:NoncontrollingInterestMember2021-07-012021-09-300000776867wtm:BamMemberwtm:TotalEquityIncludesNoncontrollingInterestMember2021-07-012021-09-300000776867us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2021-09-300000776867us-gaap:RetainedEarningsMember2021-09-300000776867us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-09-300000776867us-gaap:ParentMember2021-09-300000776867us-gaap:NoncontrollingInterestMember2021-09-300000776867wtm:TotalEquityIncludesNoncontrollingInterestMember2021-09-300000776867us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2020-06-300000776867us-gaap:RetainedEarningsMember2020-06-300000776867us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-06-300000776867us-gaap:ParentMember2020-06-300000776867us-gaap:NoncontrollingInterestMember2020-06-300000776867wtm:TotalEquityIncludesNoncontrollingInterestMember2020-06-300000776867us-gaap:RetainedEarningsMember2020-07-012020-09-300000776867us-gaap:ParentMember2020-07-012020-09-300000776867us-gaap:NoncontrollingInterestMember2020-07-012020-09-300000776867wtm:TotalEquityIncludesNoncontrollingInterestMember2020-07-012020-09-300000776867us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-07-012020-09-300000776867us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2020-07-012020-09-300000776867wtm:BamMemberus-gaap:NoncontrollingInterestMember2020-07-012020-09-300000776867wtm:BamMemberwtm:TotalEquityIncludesNoncontrollingInterestMember2020-07-012020-09-300000776867us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2020-09-300000776867us-gaap:RetainedEarningsMember2020-09-300000776867us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-09-300000776867us-gaap:ParentMember2020-09-300000776867us-gaap:NoncontrollingInterestMember2020-09-300000776867wtm:TotalEquityIncludesNoncontrollingInterestMember2020-09-300000776867us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2020-12-310000776867us-gaap:RetainedEarningsMember2020-12-310000776867us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000776867us-gaap:ParentMember2020-12-310000776867us-gaap:NoncontrollingInterestMember2020-12-310000776867wtm:TotalEquityIncludesNoncontrollingInterestMember2020-12-310000776867us-gaap:RetainedEarningsMember2021-01-012021-09-300000776867us-gaap:ParentMember2021-01-012021-09-300000776867us-gaap:NoncontrollingInterestMember2021-01-012021-09-300000776867wtm:TotalEquityIncludesNoncontrollingInterestMember2021-01-012021-09-300000776867us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-01-012021-09-300000776867us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2021-01-012021-09-300000776867wtm:BamMemberus-gaap:NoncontrollingInterestMember2021-01-012021-09-300000776867wtm:BamMemberwtm:TotalEquityIncludesNoncontrollingInterestMember2021-01-012021-09-300000776867us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2019-12-310000776867us-gaap:RetainedEarningsMember2019-12-310000776867us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310000776867us-gaap:ParentMember2019-12-310000776867us-gaap:NoncontrollingInterestMember2019-12-310000776867wtm:TotalEquityIncludesNoncontrollingInterestMember2019-12-310000776867us-gaap:RetainedEarningsMember2020-01-012020-09-300000776867us-gaap:ParentMember2020-01-012020-09-300000776867us-gaap:NoncontrollingInterestMember2020-01-012020-09-300000776867wtm:TotalEquityIncludesNoncontrollingInterestMember2020-01-012020-09-300000776867us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-09-300000776867us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2020-01-012020-09-300000776867wtm:BamMemberus-gaap:NoncontrollingInterestMember2020-01-012020-09-300000776867wtm:BamMemberwtm:TotalEquityIncludesNoncontrollingInterestMember2020-01-012020-09-300000776867wtm:MediaAlphaMember2021-01-012021-09-300000776867wtm:MediaAlphaMember2020-01-012020-09-3000007768672019-12-3100007768672020-09-30xbrli:pure0000776867wtm:HgGlobalMember2021-09-300000776867wtm:HgGlobalMember2012-07-310000776867wtm:SeriesABAMSurplusNoteMemberwtm:HgGlobalMember2012-07-310000776867wtm:SeriesBBAMSurplusNoteMemberwtm:HgGlobalMember2012-07-310000776867us-gaap:PreferredStockMemberwtm:HgGlobalMember2021-09-300000776867us-gaap:PreferredStockMemberwtm:HgGlobalMember2020-12-310000776867wtm:HgGlobalMemberus-gaap:CommonStockMember2020-12-310000776867wtm:HgGlobalMemberus-gaap:CommonStockMember2021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:ArkInsuranceHoldingsLimitedMember2021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMember2021-01-012021-09-300000776867wtm:NSMInsuranceHoldCoLLCMember2021-09-300000776867wtm:NSMInsuranceHoldCoLLCMember2020-12-310000776867wtm:KuduInvestmentManagementLLCMember2021-09-300000776867wtm:KuduInvestmentManagementLLCMember2020-12-310000776867wtm:ArkInsuranceHoldingsLimitedMember2021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:ThirdPointReMember2021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:ThirdPointReMember2021-04-012021-06-300000776867wtm:MediaAlphaMemberus-gaap:IPOMember2020-10-302020-10-300000776867wtm:MediaAlphaMemberwtm:SecondaryOfferingMember2020-10-300000776867wtm:MediaAlphaMember2020-10-302020-10-300000776867wtm:MediaAlphaMember2020-12-310000776867wtm:MediaAlphaMemberwtm:SecondaryOfferingMember2021-03-232021-03-230000776867wtm:MediaAlphaMemberwtm:SecondaryOfferingMember2021-03-232021-03-230000776867wtm:MediaAlphaMemberwtm:SecondaryOfferingMember2021-03-230000776867wtm:MediaAlphaMember2021-09-300000776867wtm:MediaAlphaMember2021-01-012021-09-300000776867wtm:WhiteMountainsMember2021-01-012021-09-300000776867wtm:MediaAlphaMemberus-gaap:SubsequentEventMember2021-10-310000776867wtm:ArkInsuranceHoldingsLimitedMember2021-01-012021-01-010000776867wtm:ArkInsuranceHoldingsLimitedMember2020-10-012020-10-010000776867wtm:ArkInsuranceHoldingsLimitedMember2020-10-010000776867wtm:ArkInsuranceHoldingsLimitedMember2021-01-010000776867wtm:LloydMemberwtm:ArkInsuranceHoldingsLimitedMember2020-12-310000776867wtm:ArkInsuranceHoldingsLimitedMember2020-12-310000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:ArkInsuranceHoldingsLimitedMember2021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMember2021-01-012021-03-310000776867wtm:GroupArkInsuranceLimitedMemberwtm:UnsecuredSubordinatedDebtMemberwtm:ArkInsuranceHoldingsLimitedMember2021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMember2021-09-300000776867wtm:FreshInsuranceServicesGroupLimitedMember2018-05-180000776867wtm:FreshInsuranceServicesGroupLimitedMember2018-05-182018-05-180000776867wtm:FreshInsuranceServicesGroupLimitedMember2019-01-012019-09-30wtm:earnout_periodiso4217:GBP0000776867wtm:FreshInsuranceServicesGroupLimitedMemberus-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember2021-04-122021-04-120000776867wtm:FreshInsuranceServicesGroupLimitedMemberus-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember2021-01-012021-03-310000776867wtm:KBKInsuranceGroupInc.KBKPremiumServicesInc.Member2018-12-032018-12-030000776867wtm:NSMInsuranceHoldCoLLCMember2018-12-032018-12-030000776867wtm:KBKInsuranceGroupInc.KBKPremiumServicesInc.Member2019-03-310000776867wtm:KBKInsuranceGroupInc.KBKPremiumServicesInc.Member2019-03-312019-03-310000776867wtm:KBKInsuranceGroupInc.KBKPremiumServicesInc.Member2021-01-012021-03-310000776867wtm:KBKInsuranceGroupInc.KBKPremiumServicesInc.Member2020-01-012020-03-310000776867wtm:NSMInsuranceGroupMemberwtm:KBKInsuranceGroupInc.KBKPremiumServicesInc.Member2021-09-300000776867wtm:NSMInsuranceGroupMemberwtm:KingsbridgeGroupLimitedMember2020-04-070000776867wtm:NSMInsuranceGroupMemberwtm:KingsbridgeGroupLimitedMember2020-04-072020-04-070000776867wtm:NSMInsuranceGroupMemberwtm:KingsbridgeGroupLimitedMember2020-10-012020-12-310000776867wtm:NSMInsuranceGroupMemberwtm:KingsbridgeGroupLimitedMember2021-09-300000776867wtm:NSMInsuranceGroupMemberwtm:JCTaylorInsuranceMember2021-08-060000776867wtm:JCTaylorInsuranceMember2021-08-062021-08-060000776867wtm:JCTaylorInsuranceMember2021-08-060000776867wtm:DavidShieldMember2018-01-240000776867wtm:PassportCardMember2018-01-240000776867wtm:DavidShieldPassportCardMember2018-01-242018-01-240000776867wtm:DavidShieldPassportCardMember2020-05-072020-05-070000776867wtm:DavidShieldPassportCardMember2020-05-060000776867wtm:DavidShieldPassportCardMember2020-05-070000776867wtm:DavidShieldPassportCardMember2021-09-300000776867us-gaap:FixedMaturitiesMember2021-07-012021-09-300000776867us-gaap:FixedMaturitiesMember2020-07-012020-09-300000776867us-gaap:FixedMaturitiesMember2021-01-012021-09-300000776867us-gaap:FixedMaturitiesMember2020-01-012020-09-300000776867us-gaap:ShortTermInvestmentsMember2021-07-012021-09-300000776867us-gaap:ShortTermInvestmentsMember2020-07-012020-09-300000776867us-gaap:ShortTermInvestmentsMember2021-01-012021-09-300000776867us-gaap:ShortTermInvestmentsMember2020-01-012020-09-300000776867us-gaap:CommonStockMember2021-07-012021-09-300000776867us-gaap:CommonStockMember2020-07-012020-09-300000776867us-gaap:CommonStockMember2021-01-012021-09-300000776867us-gaap:CommonStockMember2020-01-012020-09-300000776867wtm:MediaAlphaMember2021-07-012021-09-300000776867wtm:MediaAlphaMember2020-07-012020-09-300000776867wtm:MediaAlphaMember2021-01-012021-09-300000776867wtm:MediaAlphaMember2020-01-012020-09-300000776867us-gaap:OtherLongTermInvestmentsMember2021-07-012021-09-300000776867us-gaap:OtherLongTermInvestmentsMember2020-07-012020-09-300000776867us-gaap:OtherLongTermInvestmentsMember2021-01-012021-09-300000776867us-gaap:OtherLongTermInvestmentsMember2020-01-012020-09-300000776867wtm:TPCProvidersMember2021-07-012021-09-300000776867wtm:TPCProvidersMember2020-07-012020-09-300000776867wtm:TPCProvidersMember2021-01-012021-09-300000776867wtm:TPCProvidersMember2020-01-012020-09-300000776867wtm:TotalInvestmentsMember2021-07-012021-09-300000776867wtm:TotalInvestmentsMember2020-07-012020-09-300000776867wtm:TotalInvestmentsMember2021-01-012021-09-300000776867wtm:TotalInvestmentsMember2020-01-012020-09-300000776867wtm:InvestmentsHeldMember2021-07-012021-09-300000776867wtm:InvestmentsHeldMember2020-07-012020-09-300000776867wtm:InvestmentsHeldMember2021-01-012021-09-300000776867wtm:InvestmentsHeldMember2020-01-012020-09-300000776867us-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMember2021-07-012021-09-300000776867us-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMember2020-07-012020-09-300000776867us-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMember2021-01-012021-09-300000776867us-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMember2020-01-012020-09-300000776867us-gaap:FairValueInputsLevel3Member2021-07-012021-09-300000776867us-gaap:FairValueInputsLevel3Member2020-07-012020-09-300000776867us-gaap:FairValueInputsLevel3Member2021-01-012021-09-300000776867us-gaap:FairValueInputsLevel3Member2020-01-012020-09-300000776867us-gaap:USTreasuryAndGovernmentMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMember2021-09-300000776867us-gaap:MunicipalBondsMember2021-09-300000776867us-gaap:AssetBackedSecuritiesMember2021-09-300000776867us-gaap:CollateralizedLoanObligationsMember2021-09-300000776867us-gaap:FixedIncomeInvestmentsMember2021-09-300000776867us-gaap:USTreasuryAndGovernmentMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMember2020-12-310000776867us-gaap:MunicipalBondsMember2020-12-310000776867us-gaap:AssetBackedSecuritiesMember2020-12-310000776867us-gaap:FixedIncomeInvestmentsMember2020-12-310000776867wtm:FixedMaturitiesAndConvertibleFixedMaturitiesExcludingMortgageBackedSecuritesAssetBackedSecuritiesAndPreferredStockMember2021-09-300000776867us-gaap:CommonStockMember2021-09-300000776867wtm:MediaAlphaMember2021-09-300000776867wtm:OtherLongTermInvestmentsExcludingEquityMethodInvestmentsMember2021-09-300000776867wtm:OtherLongTermInvestmentsExcludingEquityMethodInvestmentsMember2021-01-012021-09-300000776867wtm:MediaAlphaMember2020-12-310000776867wtm:MediaAlphaMember2020-01-012020-12-310000776867wtm:OtherLongTermInvestmentsExcludingEquityMethodInvestmentsMember2020-12-310000776867wtm:OtherLongTermInvestmentsExcludingEquityMethodInvestmentsMember2020-01-012020-12-3100007768672020-01-012020-12-310000776867us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000776867us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-09-300000776867us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000776867us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:FinancialsMemberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:FinancialsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:FinancialsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:FinancialsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:ConsumerMemberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:ConsumerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:ConsumerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:ConsumerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberwtm:IndustrialMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwtm:IndustrialMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberwtm:IndustrialMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberwtm:IndustrialMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberwtm:TechnologyMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwtm:TechnologyMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberwtm:TechnologyMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberwtm:TechnologyMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:HealthCareMemberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:HealthCareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:HealthCareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:HealthCareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberwtm:UtilitiesMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwtm:UtilitiesMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberwtm:UtilitiesMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberwtm:UtilitiesMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:CommunicationsMemberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:CommunicationsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:CommunicationsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:CommunicationsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberwtm:EnergyMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwtm:EnergyMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberwtm:EnergyMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberwtm:EnergyMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:BasicMaterialsMemberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:BasicMaterialsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:BasicMaterialsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:BasicMaterialsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MunicipalBondsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:MunicipalBondsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MunicipalBondsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MunicipalBondsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AssetBackedSecuritiesMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel1Member2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CollateralizedLoanObligationsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:CollateralizedLoanObligationsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:CollateralizedLoanObligationsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:CollateralizedLoanObligationsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FixedMaturitiesMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FixedMaturitiesMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FixedMaturitiesMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FixedMaturitiesMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ShortTermInvestmentsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:ShortTermInvestmentsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ShortTermInvestmentsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ShortTermInvestmentsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquitySecuritiesMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel1Member2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-09-300000776867wtm:MediaAlphaMemberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000776867wtm:MediaAlphaMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-09-300000776867wtm:MediaAlphaMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000776867wtm:MediaAlphaMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherLongTermInvestmentsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherLongTermInvestmentsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherLongTermInvestmentsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberwtm:OtherLongTermInvestmentNAVMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwtm:OtherLongTermInvestmentNAVMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberwtm:OtherLongTermInvestmentNAVMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberwtm:OtherLongTermInvestmentNAVMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMember2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000776867us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000776867us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000776867us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000776867us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:FinancialsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:FinancialsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:FinancialsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:FinancialsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:ConsumerMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:ConsumerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:ConsumerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:ConsumerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberwtm:IndustrialMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwtm:IndustrialMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberwtm:IndustrialMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberwtm:IndustrialMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberwtm:TechnologyMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwtm:TechnologyMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberwtm:TechnologyMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberwtm:TechnologyMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:HealthCareMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:HealthCareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:HealthCareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:HealthCareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:CommunicationsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:CommunicationsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:CommunicationsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:CommunicationsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberwtm:EnergyMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwtm:EnergyMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberwtm:EnergyMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberwtm:EnergyMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:BasicMaterialsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:BasicMaterialsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:BasicMaterialsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:BasicMaterialsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberwtm:UtilitiesMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwtm:UtilitiesMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberwtm:UtilitiesMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberwtm:UtilitiesMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MunicipalBondsMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:MunicipalBondsMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MunicipalBondsMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MunicipalBondsMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AssetBackedSecuritiesMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel1Member2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FixedMaturitiesMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FixedMaturitiesMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FixedMaturitiesMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FixedMaturitiesMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ShortTermInvestmentsMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:ShortTermInvestmentsMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ShortTermInvestmentsMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ShortTermInvestmentsMember2020-12-310000776867wtm:MediaAlphaMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000776867wtm:MediaAlphaMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000776867wtm:MediaAlphaMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000776867wtm:MediaAlphaMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberwtm:OtherLongTermInvestmentsExcludingNAVMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwtm:OtherLongTermInvestmentsExcludingNAVMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberwtm:OtherLongTermInvestmentsExcludingNAVMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberwtm:OtherLongTermInvestmentsExcludingNAVMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberwtm:OtherLongTermInvestmentNAVMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwtm:OtherLongTermInvestmentNAVMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberwtm:OtherLongTermInvestmentNAVMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberwtm:OtherLongTermInvestmentNAVMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherLongTermInvestmentsMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherLongTermInvestmentsMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherLongTermInvestmentsMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMember2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000776867us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000776867us-gaap:CorporateDebtSecuritiesMembersrt:StandardPoorsAAARatingMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMembersrt:StandardPoorsAAARatingMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMembersrt:StandardPoorsAARatingMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMembersrt:StandardPoorsAARatingMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMembersrt:StandardPoorsARatingMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMembersrt:StandardPoorsARatingMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMembersrt:StandardPoorsBBBRatingMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMembersrt:StandardPoorsBBBRatingMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMembersrt:StandardPoorsBBRatingMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMembersrt:StandardPoorsBBRatingMember2020-12-310000776867us-gaap:CorporateDebtSecuritiesMemberwtm:StandardPoorsOtherMember2021-09-300000776867us-gaap:CorporateDebtSecuritiesMemberwtm:StandardPoorsOtherMember2020-12-310000776867us-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMemberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:FairValueInputsLevel3Memberus-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMemberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:FairValueInputsLevel3Memberus-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMemberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMemberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:FairValueInputsLevel2Memberus-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:FairValueInputsLevel3Memberus-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:FairValueInputsLevel2Memberus-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:FairValueInputsLevel3Memberus-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867us-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:CollateralizedCreditCardSecuritiesMember2021-09-300000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:CollateralizedCreditCardSecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-09-300000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:CollateralizedCreditCardSecuritiesMember2021-09-300000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:CollateralizedCreditCardSecuritiesMember2020-12-310000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:CollateralizedCreditCardSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:CollateralizedCreditCardSecuritiesMember2020-12-310000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:CollateralizedAutoLoansMember2021-09-300000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:CollateralizedAutoLoansMemberus-gaap:FairValueInputsLevel2Member2021-09-300000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:CollateralizedAutoLoansMember2021-09-300000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:CollateralizedAutoLoansMember2020-12-310000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:CollateralizedAutoLoansMemberus-gaap:FairValueInputsLevel2Member2020-12-310000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:CollateralizedAutoLoansMember2020-12-310000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2021-09-300000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel2Member2021-09-300000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel3Member2021-09-300000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2020-12-310000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel2Member2020-12-310000776867us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000776867us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-09-300000776867us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-09-300000776867us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310000776867us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000776867us-gaap:FairValueInputsLevel2Memberus-gaap:CollateralizedLoanObligationsMember2021-09-300000776867us-gaap:FairValueInputsLevel3Memberus-gaap:CollateralizedLoanObligationsMember2021-09-300000776867us-gaap:CollateralizedLoanObligationsMember2020-12-310000776867us-gaap:FairValueInputsLevel2Memberus-gaap:CollateralizedLoanObligationsMember2020-12-310000776867us-gaap:FairValueInputsLevel3Memberus-gaap:CollateralizedLoanObligationsMember2020-12-310000776867wtm:MortgageAndAssetBackedSecuritiesAndCollateralizedLoanObligationsMember2021-09-300000776867us-gaap:FairValueInputsLevel2Memberwtm:MortgageAndAssetBackedSecuritiesAndCollateralizedLoanObligationsMember2021-09-300000776867us-gaap:FairValueInputsLevel3Memberwtm:MortgageAndAssetBackedSecuritiesAndCollateralizedLoanObligationsMember2021-09-300000776867wtm:MortgageAndAssetBackedSecuritiesAndCollateralizedLoanObligationsMember2020-12-310000776867us-gaap:FairValueInputsLevel2Memberwtm:MortgageAndAssetBackedSecuritiesAndCollateralizedLoanObligationsMember2020-12-310000776867us-gaap:FairValueInputsLevel3Memberwtm:MortgageAndAssetBackedSecuritiesAndCollateralizedLoanObligationsMember2020-12-310000776867us-gaap:CollateralizedMortgageObligationsMemberus-gaap:MortgageBackedSecuritiesMember2021-09-300000776867wtm:KuduInvestmentManagementLLCMember2021-09-300000776867wtm:KuduInvestmentManagementLLCMember2020-12-310000776867wtm:DavidShieldPassportCardMember2021-09-300000776867wtm:DavidShieldPassportCardMember2020-12-310000776867wtm:ElementumHoldingsL.P.Member2021-09-300000776867wtm:ElementumHoldingsL.P.Member2020-12-310000776867wtm:OtherUnconsolidatedPrivateEquityInvestmentsMember2021-09-300000776867wtm:OtherUnconsolidatedPrivateEquityInvestmentsMember2020-12-310000776867wtm:TotalUnconsolidatedEntitiesMember2021-09-300000776867wtm:TotalUnconsolidatedEntitiesMember2020-12-310000776867wtm:HedgeFundsAndPrivateEquityFundsMember2021-09-300000776867wtm:HedgeFundsAndPrivateEquityFundsMember2020-12-310000776867wtm:BankLoanFundMember2021-09-300000776867wtm:BankLoanFundMember2020-12-310000776867wtm:ForeignRegulatoryDepositsMember2021-09-300000776867wtm:ForeignRegulatoryDepositsMember2020-12-310000776867wtm:InsuranceLinkedSecuritiesFundsMember2021-09-300000776867wtm:InsuranceLinkedSecuritiesFundsMember2020-12-310000776867wtm:PrivateDebtInstrumentMember2021-09-300000776867wtm:PrivateDebtInstrumentMember2020-12-310000776867wtm:OtherFundsMember2021-09-300000776867wtm:OtherFundsMember2020-12-31wtm:fund0000776867us-gaap:PrivateEquityFundsMember2021-09-300000776867us-gaap:HedgeFundsMember2021-09-300000776867wtm:AerospaceDefenseGovernmentMemberus-gaap:PrivateEquityFundsMember2021-09-300000776867wtm:AerospaceDefenseGovernmentMemberus-gaap:PrivateEquityFundsMember2020-12-310000776867wtm:FinancialServicesMemberus-gaap:PrivateEquityFundsMember2021-09-300000776867wtm:FinancialServicesMemberus-gaap:PrivateEquityFundsMember2020-12-310000776867us-gaap:RealEstateMemberus-gaap:PrivateEquityFundsMember2021-09-300000776867us-gaap:RealEstateMemberus-gaap:PrivateEquityFundsMember2020-12-310000776867wtm:PrivateEquityFundsManufacturingAndIndustrialMemberus-gaap:PrivateEquityFundsMember2021-09-300000776867wtm:PrivateEquityFundsManufacturingAndIndustrialMemberus-gaap:PrivateEquityFundsMember2020-12-310000776867us-gaap:PrivateEquityFundsMember2021-09-300000776867us-gaap:PrivateEquityFundsMember2020-12-310000776867us-gaap:HedgeFundsMemberwtm:HedgeFundLongShortEquityBanksandFinancialMember2021-09-300000776867us-gaap:HedgeFundsMemberwtm:HedgeFundLongShortEquityBanksandFinancialMember2020-12-310000776867us-gaap:HedgeFundsMember2021-09-300000776867us-gaap:HedgeFundsMember2020-12-310000776867wtm:FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriod1To3YearsMemberus-gaap:PrivateEquityFundsMember2021-09-300000776867wtm:FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriod3To5YearsMemberus-gaap:PrivateEquityFundsMember2021-09-300000776867wtm:FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriod5To10YearsMemberus-gaap:PrivateEquityFundsMember2021-09-300000776867us-gaap:PrivateEquityFundsMemberwtm:FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriodOver10YearsMember2021-09-300000776867wtm:LloydsBankMember2021-09-300000776867wtm:BankLoanFundMember2021-09-300000776867wtm:InsuranceLinkedSecuritiesFundsMember2021-09-300000776867srt:MinimumMember2021-01-012021-09-300000776867srt:MaximumMember2021-01-012021-09-300000776867us-gaap:FairValueInputsLevel1Member2020-12-310000776867us-gaap:FairValueInputsLevel2Member2020-12-310000776867us-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMember2020-12-310000776867us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberwtm:HedgeFundsAndPrivateEquityFundsMember2020-12-310000776867us-gaap:FairValueInputsLevel1Member2021-01-012021-09-300000776867us-gaap:FairValueInputsLevel2Member2021-01-012021-09-300000776867us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberwtm:HedgeFundsAndPrivateEquityFundsMember2021-01-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberus-gaap:FairValueInputsLevel1Member2021-01-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberus-gaap:FairValueInputsLevel2Member2021-01-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMember2021-01-012021-09-300000776867us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberwtm:ArkInsuranceHoldingsLimitedMemberwtm:HedgeFundsAndPrivateEquityFundsMember2021-01-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMember2021-01-012021-09-300000776867us-gaap:FairValueInputsLevel1Member2021-09-300000776867us-gaap:FairValueInputsLevel2Member2021-09-300000776867us-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMember2021-09-300000776867us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberwtm:HedgeFundsAndPrivateEquityFundsMember2021-09-300000776867us-gaap:ShortTermInvestmentsMember2021-09-300000776867us-gaap:ShortTermInvestmentsMember2020-12-310000776867wtm:ThirdPartyCapitalProvidersMember2021-01-012021-09-300000776867us-gaap:FairValueInputsLevel1Member2019-12-310000776867us-gaap:FairValueInputsLevel2Member2019-12-310000776867us-gaap:FairValueInputsLevel3Memberus-gaap:CommonStockMember2019-12-310000776867us-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMember2019-12-310000776867us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberwtm:HedgeFundsAndPrivateEquityFundsMember2019-12-310000776867us-gaap:FairValueInputsLevel1Member2020-01-012020-09-300000776867us-gaap:FairValueInputsLevel2Member2020-01-012020-09-300000776867us-gaap:FairValueInputsLevel3Memberus-gaap:CommonStockMember2020-01-012020-09-300000776867us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberwtm:HedgeFundsAndPrivateEquityFundsMember2020-01-012020-09-300000776867us-gaap:FairValueInputsLevel1Member2020-09-300000776867us-gaap:FairValueInputsLevel2Member2020-09-300000776867us-gaap:FairValueInputsLevel3Memberus-gaap:CommonStockMember2020-09-300000776867us-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMember2020-09-300000776867us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberwtm:HedgeFundsAndPrivateEquityFundsMember2020-09-300000776867us-gaap:ShortTermInvestmentsMember2020-09-300000776867us-gaap:ShortTermInvestmentsMember2019-12-310000776867wtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMember2021-09-300000776867wtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMember2020-12-310000776867wtm:DiscountedCashFlowValuationTechniqueMemberwtm:KuduInvestmentsMemberwtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Member2021-09-300000776867wtm:DiscountedCashFlowValuationTechniqueMemberwtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberwtm:DavidShieldPassportCardMember2021-09-300000776867us-gaap:MeasurementInputDiscountRateMemberwtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberwtm:DavidShieldPassportCardMember2021-01-012021-09-300000776867wtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberwtm:DavidShieldPassportCardMemberus-gaap:MeasurementInputLongTermRevenueGrowthRateMember2021-09-300000776867wtm:DiscountedCashFlowValuationTechniqueMemberwtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberwtm:ElementumHoldingsL.P.Member2021-09-300000776867us-gaap:MeasurementInputDiscountRateMemberwtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberwtm:ElementumHoldingsL.P.Member2021-01-012021-09-300000776867wtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberwtm:ElementumHoldingsL.P.Memberus-gaap:MeasurementInputLongTermRevenueGrowthRateMember2021-09-300000776867wtm:DiscountedCashFlowValuationTechniqueMemberwtm:PrivateDebtInstrumentMemberwtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Member2021-09-300000776867wtm:DiscountedCashFlowValuationTechniqueMemberwtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMember2021-09-300000776867wtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMemberus-gaap:MeasurementInputLongTermRevenueGrowthRateMember2021-09-300000776867wtm:TIGAdvisorsLLCTKPartnersLLCThirdEyeCapitalManagementAndDouglassWinthropAdvisorsMemberwtm:KuduMember2021-01-012021-09-300000776867wtm:KuduInvestmentsMemberwtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberwtm:ProbabilityWeightedExpectedReturnMethodMember2021-09-300000776867wtm:DiscountedCashFlowValuationTechniqueMemberwtm:KuduInvestmentsMemberwtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Member2020-12-310000776867wtm:DiscountedCashFlowValuationTechniqueMemberwtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberwtm:DavidShieldPassportCardMember2020-12-310000776867us-gaap:MeasurementInputDiscountRateMemberwtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberwtm:DavidShieldPassportCardMember2020-01-012020-12-310000776867wtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberwtm:DavidShieldPassportCardMemberus-gaap:MeasurementInputLongTermRevenueGrowthRateMember2020-12-310000776867wtm:DiscountedCashFlowValuationTechniqueMemberwtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberwtm:ElementumHoldingsL.P.Member2020-12-310000776867us-gaap:MeasurementInputDiscountRateMemberwtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberwtm:ElementumHoldingsL.P.Member2020-01-012020-12-310000776867wtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberwtm:ElementumHoldingsL.P.Memberus-gaap:MeasurementInputLongTermRevenueGrowthRateMember2020-12-310000776867wtm:DiscountedCashFlowValuationTechniqueMemberwtm:PrivateDebtInstrumentMemberwtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Member2020-12-310000776867wtm:DiscountedCashFlowValuationTechniqueMemberwtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMember2020-12-310000776867wtm:StandardPoorsNrRatingMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherLongTermInvestmentsMemberus-gaap:MeasurementInputLongTermRevenueGrowthRateMember2020-12-310000776867wtm:KuduMember2020-01-012020-12-310000776867wtm:DavidShieldPassportCardMember2020-01-012020-12-310000776867us-gaap:MeasurementInputDiscountRateMemberwtm:KuduInvestmentsMemberwtm:StandardPoorsNrRatingMembersrt:MinimumMember2021-01-012021-09-300000776867us-gaap:MeasurementInputDiscountRateMemberwtm:KuduInvestmentsMembersrt:MaximumMemberwtm:StandardPoorsNrRatingMember2021-01-012021-09-300000776867wtm:KuduInvestmentsMemberwtm:StandardPoorsNrRatingMemberwtm:TerminalMultipleMembersrt:MinimumMember2021-09-300000776867wtm:KuduInvestmentsMembersrt:MaximumMemberwtm:StandardPoorsNrRatingMemberwtm:TerminalMultipleMember2021-09-300000776867us-gaap:MeasurementInputDiscountRateMemberwtm:PrivateDebtInstrumentMemberwtm:StandardPoorsNrRatingMembersrt:MinimumMember2021-01-012021-09-300000776867us-gaap:MeasurementInputDiscountRateMemberwtm:PrivateDebtInstrumentMembersrt:MaximumMemberwtm:StandardPoorsNrRatingMember2021-01-012021-09-300000776867us-gaap:MeasurementInputDiscountRateMemberwtm:StandardPoorsNrRatingMemberus-gaap:OtherLongTermInvestmentsMembersrt:MinimumMember2021-01-012021-09-300000776867us-gaap:MeasurementInputDiscountRateMembersrt:MaximumMemberwtm:StandardPoorsNrRatingMemberus-gaap:OtherLongTermInvestmentsMember2021-01-012021-09-300000776867us-gaap:MeasurementInputDiscountRateMemberwtm:KuduInvestmentsMemberwtm:StandardPoorsNrRatingMembersrt:MinimumMember2020-01-012020-12-310000776867us-gaap:MeasurementInputDiscountRateMemberwtm:KuduInvestmentsMembersrt:MaximumMemberwtm:StandardPoorsNrRatingMember2020-01-012020-12-310000776867wtm:KuduInvestmentsMemberwtm:StandardPoorsNrRatingMemberwtm:TerminalMultipleMembersrt:MinimumMember2020-12-310000776867wtm:KuduInvestmentsMembersrt:MaximumMemberwtm:StandardPoorsNrRatingMemberwtm:TerminalMultipleMember2020-12-310000776867us-gaap:MeasurementInputDiscountRateMemberwtm:PrivateDebtInstrumentMemberwtm:StandardPoorsNrRatingMembersrt:MinimumMember2020-01-012020-12-310000776867us-gaap:MeasurementInputDiscountRateMemberwtm:PrivateDebtInstrumentMembersrt:MaximumMemberwtm:StandardPoorsNrRatingMember2020-01-012020-12-310000776867us-gaap:MeasurementInputDiscountRateMemberwtm:StandardPoorsNrRatingMemberus-gaap:OtherLongTermInvestmentsMembersrt:MinimumMember2020-01-012020-12-310000776867us-gaap:MeasurementInputDiscountRateMembersrt:MaximumMemberwtm:StandardPoorsNrRatingMemberus-gaap:OtherLongTermInvestmentsMember2020-01-012020-12-310000776867wtm:ArkInsuranceHoldingsLimitedMember2021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMember2020-12-310000776867wtm:ArkInsuranceHoldingsLimitedMember2020-01-012020-12-310000776867wtm:NSMInsuranceGroupMember2021-09-300000776867wtm:NSMInsuranceGroupMember2020-12-310000776867wtm:NSMInsuranceGroupMember2020-01-012020-12-310000776867wtm:KuduInvestmentManagementLLCMember2021-09-300000776867wtm:KuduInvestmentManagementLLCMember2020-12-310000776867wtm:KuduInvestmentManagementLLCMember2020-01-012020-12-310000776867wtm:OtherMember2021-09-300000776867wtm:OtherMember2021-01-012021-09-300000776867wtm:OtherMember2020-12-310000776867wtm:OtherMember2020-01-012020-12-310000776867wtm:ArkInsuranceHoldingsLimitedMemberus-gaap:TradeNamesMember2021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberus-gaap:TradeNamesMember2021-01-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberus-gaap:TradeNamesMember2020-12-310000776867wtm:ArkInsuranceHoldingsLimitedMemberus-gaap:TradeNamesMember2020-01-012020-12-310000776867us-gaap:CustomerRelationshipsMemberwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867us-gaap:CustomerRelationshipsMemberwtm:NSMInsuranceGroupMember2021-09-300000776867us-gaap:CustomerRelationshipsMemberwtm:NSMInsuranceGroupMember2020-12-310000776867us-gaap:CustomerRelationshipsMemberwtm:NSMInsuranceGroupMember2020-01-012020-12-310000776867us-gaap:TradeNamesMemberwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867us-gaap:TradeNamesMemberwtm:NSMInsuranceGroupMember2021-09-300000776867us-gaap:TradeNamesMemberwtm:NSMInsuranceGroupMember2020-12-310000776867us-gaap:TradeNamesMemberwtm:NSMInsuranceGroupMember2020-01-012020-12-310000776867wtm:InformationTechnologyMemberwtm:NSMInsuranceGroupMember2021-09-300000776867wtm:InformationTechnologyMemberwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867wtm:InformationTechnologyMemberwtm:NSMInsuranceGroupMember2020-12-310000776867wtm:InformationTechnologyMemberwtm:NSMInsuranceGroupMember2020-01-012020-12-310000776867wtm:RenewalRightsMemberwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867wtm:RenewalRightsMemberwtm:NSMInsuranceGroupMember2021-09-300000776867wtm:RenewalRightsMemberwtm:NSMInsuranceGroupMember2020-12-310000776867wtm:RenewalRightsMemberwtm:NSMInsuranceGroupMember2020-01-012020-12-310000776867us-gaap:OtherIntangibleAssetsMemberwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867us-gaap:OtherIntangibleAssetsMemberwtm:NSMInsuranceGroupMember2021-09-300000776867us-gaap:OtherIntangibleAssetsMemberwtm:NSMInsuranceGroupMember2020-12-310000776867us-gaap:OtherIntangibleAssetsMemberwtm:NSMInsuranceGroupMember2020-01-012020-12-310000776867us-gaap:TradeNamesMemberwtm:KuduInvestmentManagementLLCMember2021-01-012021-09-300000776867us-gaap:TradeNamesMemberwtm:KuduInvestmentManagementLLCMember2021-09-300000776867us-gaap:TradeNamesMemberwtm:KuduInvestmentManagementLLCMember2020-12-310000776867us-gaap:TradeNamesMemberwtm:KuduInvestmentManagementLLCMember2020-01-012020-12-310000776867us-gaap:TradeNamesMemberwtm:OtherMember2021-01-012021-09-300000776867us-gaap:TradeNamesMemberwtm:OtherMember2021-09-300000776867us-gaap:TradeNamesMemberwtm:OtherMember2020-12-310000776867us-gaap:TradeNamesMemberwtm:OtherMember2020-01-012020-12-310000776867us-gaap:CustomerRelationshipsMemberwtm:OtherMember2021-01-012021-09-300000776867us-gaap:CustomerRelationshipsMemberwtm:OtherMember2021-09-300000776867us-gaap:CustomerRelationshipsMemberwtm:OtherMember2020-12-310000776867us-gaap:CustomerRelationshipsMemberwtm:OtherMember2020-01-012020-12-310000776867us-gaap:LicensingAgreementsMemberwtm:OtherMember2021-09-300000776867us-gaap:LicensingAgreementsMemberwtm:OtherMember2021-01-012021-09-300000776867us-gaap:LicensingAgreementsMemberwtm:OtherMember2020-12-310000776867us-gaap:LicensingAgreementsMemberwtm:OtherMember2020-01-012020-12-310000776867us-gaap:OtherIntangibleAssetsMemberwtm:OtherMember2021-01-012021-09-300000776867us-gaap:OtherIntangibleAssetsMemberwtm:OtherMember2021-09-300000776867us-gaap:OtherIntangibleAssetsMemberwtm:OtherMember2020-12-310000776867us-gaap:OtherIntangibleAssetsMemberwtm:OtherMember2020-01-012020-12-310000776867us-gaap:GoodwillMemberwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867us-gaap:OtherIntangibleAssetsMemberwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867us-gaap:GoodwillMemberwtm:NSMInsuranceGroupMember2020-01-012020-12-310000776867us-gaap:OtherIntangibleAssetsMemberwtm:NSMInsuranceGroupMember2020-01-012020-12-310000776867wtm:KingsbridgeMemberwtm:NSMInsuranceGroupMember2020-04-070000776867wtm:JCTaylorMemberwtm:NSMInsuranceGroupMember2021-08-060000776867wtm:NSMInsuranceGroupMember2021-08-060000776867wtm:NSMInsuranceGroupMember2020-04-070000776867wtm:OtherOperationsMember2021-05-010000776867wtm:OtherOperationsMember2020-07-0200007768672021-01-012021-03-3100007768672020-04-012020-06-300000776867us-gaap:GoodwillMember2021-06-300000776867us-gaap:OtherIntangibleAssetsMember2021-06-300000776867wtm:IntangibleAssetandGoodwillMember2021-06-300000776867us-gaap:GoodwillMember2020-06-300000776867us-gaap:OtherIntangibleAssetsMember2020-06-300000776867wtm:IntangibleAssetandGoodwillMember2020-06-300000776867us-gaap:GoodwillMember2021-07-012021-09-300000776867us-gaap:OtherIntangibleAssetsMember2021-07-012021-09-300000776867wtm:IntangibleAssetandGoodwillMember2021-07-012021-09-300000776867us-gaap:GoodwillMember2020-07-012020-09-300000776867us-gaap:OtherIntangibleAssetsMember2020-07-012020-09-300000776867wtm:IntangibleAssetandGoodwillMember2020-07-012020-09-300000776867us-gaap:GoodwillMember2021-09-300000776867us-gaap:OtherIntangibleAssetsMember2021-09-300000776867wtm:IntangibleAssetandGoodwillMember2021-09-300000776867us-gaap:GoodwillMember2020-09-300000776867us-gaap:OtherIntangibleAssetsMember2020-09-300000776867wtm:IntangibleAssetandGoodwillMember2020-09-300000776867us-gaap:GoodwillMember2020-12-310000776867us-gaap:OtherIntangibleAssetsMember2020-12-310000776867wtm:IntangibleAssetandGoodwillMember2020-12-310000776867us-gaap:GoodwillMember2019-12-310000776867us-gaap:OtherIntangibleAssetsMember2019-12-310000776867wtm:IntangibleAssetandGoodwillMember2019-12-310000776867us-gaap:GoodwillMember2021-01-012021-09-300000776867us-gaap:OtherIntangibleAssetsMember2021-01-012021-09-300000776867wtm:IntangibleAssetandGoodwillMember2021-01-012021-09-300000776867us-gaap:GoodwillMember2020-01-012020-09-300000776867us-gaap:OtherIntangibleAssetsMember2020-01-012020-09-300000776867wtm:IntangibleAssetandGoodwillMember2020-01-012020-09-300000776867us-gaap:GoodwillMemberwtm:ArkInsuranceHoldingsLimitedMember2021-01-012021-09-300000776867us-gaap:OtherIntangibleAssetsMemberwtm:ArkInsuranceHoldingsLimitedMember2021-01-012021-09-300000776867wtm:IntangibleAssetandGoodwillMemberwtm:ArkInsuranceHoldingsLimitedMember2021-01-012021-09-300000776867us-gaap:GoodwillMemberwtm:ArkInsuranceHoldingsLimitedMember2020-01-012020-09-300000776867us-gaap:OtherIntangibleAssetsMemberwtm:ArkInsuranceHoldingsLimitedMember2020-01-012020-09-300000776867wtm:IntangibleAssetandGoodwillMemberwtm:ArkInsuranceHoldingsLimitedMember2020-01-012020-09-300000776867wtm:JCTaylorMemberus-gaap:GoodwillMember2021-01-012021-09-300000776867wtm:OtherOperationsMemberus-gaap:GoodwillMember2021-01-012021-09-300000776867wtm:FreshInsuranceServicesGroupLimitedMember2021-01-012021-03-3100007768672021-06-300000776867wtm:ArkInsuranceHoldingsLimitedMember2021-07-012021-09-300000776867wtm:TPCProvidersMember2021-09-300000776867wtm:AMBestARatingOrBetterMemberwtm:AllEntitiesExceptTPCProvidersMember2021-09-300000776867wtm:AllEntitiesExceptTPCProvidersMemberwtm:AMBestAToARatingMember2021-09-300000776867wtm:AMBestBOrLowerAndNotRatedMemberwtm:AllEntitiesExceptTPCProvidersMember2021-09-300000776867wtm:AllEntitiesExceptTPCProvidersMember2021-09-300000776867wtm:ArkSubordinatedNotesMemberwtm:Ark2007NotesTranche1Member2021-09-300000776867wtm:ArkSubordinatedNotesMemberwtm:Ark2007NotesTranche2Member2021-09-300000776867wtm:Ark2007NotesMemberwtm:ArkSubordinatedNotesMember2021-09-300000776867wtm:ArkSubordinatedNotesMemberwtm:Ark2021NotesTranche1Member2021-09-300000776867wtm:Ark2021NotesTranche2Memberwtm:ArkSubordinatedNotesMember2021-09-300000776867wtm:ArkSubordinatedNotesMemberwtm:Ark2021NotesTranche3Member2021-09-300000776867wtm:ArkSubordinatedNotesMember2021-09-300000776867wtm:ArkSubordinatedNotesMemberwtm:Ark2021NotesMember2021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:ArkSubordinatedNotesMember2021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMember2021-09-300000776867wtm:NSMBankFacilityMemberwtm:TermLoanMember2021-09-300000776867wtm:NSMBankFacilityMemberwtm:TermLoanMember2020-12-310000776867wtm:OtherNSMMember2021-09-300000776867wtm:TermLoanMemberwtm:OtherNSMMember2021-09-300000776867wtm:OtherNSMMember2020-12-310000776867wtm:TermLoanMemberwtm:OtherNSMMember2020-12-310000776867wtm:KuduCreditFacilityMemberwtm:TermLoanMember2021-09-300000776867wtm:KuduCreditFacilityMember2021-09-300000776867wtm:KuduBankFacilityMemberwtm:TermLoanMember2020-12-310000776867wtm:OtherMemberwtm:TermLoanMember2021-09-300000776867wtm:OtherMemberwtm:TermLoanMember2020-12-310000776867wtm:OtherOperationsMember2021-09-300000776867wtm:OtherOperationsMemberwtm:TermLoanMember2020-12-310000776867wtm:NSMBankFacilityMember2021-09-300000776867wtm:NSMBankFacilityMember2020-12-310000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:Ark2007NotesTranche1Memberus-gaap:JuniorNotesMember2007-03-31iso4217:EUR0000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:Ark2007NotesTranche2Memberus-gaap:JuniorNotesMember2007-03-310000776867wtm:UnitedStatesDollarLondonInterbankOfferedRateLIBORMemberwtm:ArkInsuranceHoldingsLimitedMemberwtm:Ark2007NotesTranche1Memberus-gaap:JuniorNotesMember2007-03-012007-03-310000776867wtm:EURIBORMemberwtm:ArkInsuranceHoldingsLimitedMemberwtm:Ark2007NotesTranche2Memberus-gaap:JuniorNotesMember2007-03-012007-03-310000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:Ark2007NotesTranche1Memberus-gaap:JuniorNotesMember2021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:Ark2007NotesTranche2Memberus-gaap:JuniorNotesMember2021-09-300000776867wtm:GroupArkInsuranceLimitedMemberwtm:UnsecuredSubordinatedDebtMember2021-07-012021-09-300000776867wtm:GroupArkInsuranceLimitedMemberwtm:Ark2021NotesTranche1Memberwtm:UnsecuredSubordinatedDebtMember2021-07-130000776867wtm:GroupArkInsuranceLimitedMemberwtm:EURIBORMemberwtm:Ark2021NotesTranche1Memberwtm:UnsecuredSubordinatedDebtMember2021-07-012021-07-310000776867wtm:GroupArkInsuranceLimitedMemberwtm:Ark2021NotesTranche2Memberwtm:UnsecuredSubordinatedDebtMember2021-08-110000776867wtm:GroupArkInsuranceLimitedMemberwtm:UnitedStatesDollarLondonInterbankOfferedRateLIBORMemberwtm:Ark2021NotesTranche2Memberwtm:UnsecuredSubordinatedDebtMember2021-08-012021-08-310000776867wtm:GroupArkInsuranceLimitedMemberwtm:Ark2021NotesTranche3Memberwtm:UnsecuredSubordinatedDebtMember2021-09-080000776867wtm:GroupArkInsuranceLimitedMemberwtm:UnitedStatesDollarLondonInterbankOfferedRateLIBORMemberwtm:Ark2021NotesTranche3Memberwtm:UnsecuredSubordinatedDebtMember2021-09-082021-09-080000776867wtm:GroupArkInsuranceLimitedMemberwtm:Ark2021NotesTranche3Memberwtm:UnsecuredSubordinatedDebtMember2021-09-082021-09-080000776867wtm:GroupArkInsuranceLimitedMemberwtm:Ark2021NotesTranche3Memberwtm:UnsecuredSubordinatedDebtMember2021-09-012021-09-300000776867wtm:Ark2021NotesTranche1Member2021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:TermLoanMember2021-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMember2020-04-060000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:TermLoanMember2020-04-060000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberus-gaap:RevolvingCreditFacilityMember2020-04-060000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMember2020-04-070000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:TermLoanMember2020-04-070000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:TermLoanMember2020-04-072020-04-070000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberus-gaap:RevolvingCreditFacilityMember2020-04-070000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:UnitedStatesDollarLondonInterbankOfferedRateLIBORMemberwtm:TermLoanMember2020-04-072020-04-070000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:UnitedStatesDollarLondonInterbankOfferedRateLIBORMemberwtm:TermLoanMembersrt:MinimumMember2020-04-062020-04-060000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:UnitedStatesDollarLondonInterbankOfferedRateLIBORMembersrt:MaximumMemberwtm:TermLoanMember2020-04-062020-04-060000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:UnitedStatesDollarLondonInterbankOfferedRateLIBORMemberwtm:TermLoanMembersrt:MinimumMember2020-04-072020-04-070000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:UnitedStatesDollarLondonInterbankOfferedRateLIBORMembersrt:MaximumMemberwtm:TermLoanMember2020-04-072020-04-070000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:UnitedStatesDollarLondonInterbankOfferedRateLIBORMemberwtm:TermLoanMembersrt:MinimumMember2021-06-012021-06-010000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:UnitedStatesDollarLondonInterbankOfferedRateLIBORMembersrt:MaximumMemberwtm:TermLoanMember2021-06-012021-06-010000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:UnitedStatesDollarLondonInterbankOfferedRateLIBORMemberwtm:TermLoanMembersrt:MinimumMember2021-06-022021-06-020000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:UnitedStatesDollarLondonInterbankOfferedRateLIBORMembersrt:MaximumMemberwtm:TermLoanMember2021-06-022021-06-020000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:BritishSterlingPoundLondonInterbankOfferedRateLIBORMemberwtm:TermLoanMembersrt:MinimumMember2021-06-012021-06-010000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:BritishSterlingPoundLondonInterbankOfferedRateLIBORMembersrt:MaximumMemberwtm:TermLoanMember2021-06-012021-06-010000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:BritishSterlingPoundLondonInterbankOfferedRateLIBORMemberwtm:TermLoanMembersrt:MinimumMember2021-06-022021-06-020000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:BritishSterlingPoundLondonInterbankOfferedRateLIBORMembersrt:MaximumMemberwtm:TermLoanMember2021-06-022021-06-020000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberus-gaap:RevolvingCreditFacilityMember2021-06-020000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:TermLoanMember2021-06-020000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMember2021-01-012021-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMember2021-06-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMember2020-06-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMember2020-12-310000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMember2019-12-310000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:TermLoanMember2021-07-012021-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:TermLoanMember2020-07-012020-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:TermLoanMember2021-01-012021-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:TermLoanMember2020-01-012020-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberus-gaap:RevolvingCreditFacilityMember2021-07-012021-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberus-gaap:RevolvingCreditFacilityMember2020-07-012020-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberus-gaap:RevolvingCreditFacilityMember2021-01-012021-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberus-gaap:RevolvingCreditFacilityMember2020-01-012020-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMember2021-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMember2020-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:KingsbridgeGroupLimitedMemberwtm:TermLoanMember2020-01-012020-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:KingsbridgeGroupLimitedMemberwtm:TermLoanMember2020-07-012020-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:TermLoanMember2021-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberwtm:GBPTermLoanMember2021-01-012021-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberus-gaap:RevolvingCreditFacilityMember2021-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberus-gaap:InterestRateSwapMemberwtm:TermLoanMember2018-06-150000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberwtm:TermLoanMember2021-09-300000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberus-gaap:InterestRateSwapMemberus-gaap:NondesignatedMemberwtm:TermLoanMember2021-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-01-012021-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-01-012020-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:NondesignatedMember2021-01-012021-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:NondesignatedMember2021-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:NondesignatedMember2020-01-012020-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:NondesignatedMember2020-09-300000776867wtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867wtm:NSMInsuranceGroupMember2020-01-012020-09-300000776867wtm:NSMInsuranceGroupMember2020-09-300000776867wtm:NSMInsuranceGroupMemberwtm:TermLoanMemberwtm:OtherNSMMember2021-09-300000776867wtm:KuduBankFacilityMemberwtm:KuduMember2021-09-300000776867wtm:KuduBankFacilityMemberus-gaap:RevolvingCreditFacilityMemberwtm:KuduMember2021-01-012021-09-300000776867us-gaap:LineOfCreditMemberus-gaap:BaseRateMemberwtm:KuduBankFacilityMemberwtm:KuduMember2021-01-012021-09-300000776867us-gaap:LineOfCreditMemberwtm:UnitedStatesDollarLondonInterbankOfferedRateLIBORMemberwtm:KuduBankFacilityMemberwtm:KuduMember2021-01-012021-09-300000776867us-gaap:LineOfCreditMemberwtm:KuduBankFacilityMemberwtm:KuduMember2021-09-300000776867wtm:KuduBankFacilityMemberwtm:TermLoanMemberwtm:KuduMember2021-09-300000776867wtm:KuduBankFacilityMemberwtm:KuduMember2021-07-012021-09-300000776867wtm:KuduBankFacilityMemberwtm:KuduMember2021-01-012021-09-30wtm:credit_facility0000776867wtm:OtherOperationsMember2021-09-300000776867wtm:FirstCreditFacilityMemberwtm:OtherOperationsMember2021-09-300000776867wtm:FirstCreditFacilityMemberwtm:OtherOperationsMemberwtm:TermLoanMember2021-09-300000776867wtm:DelayedDrawTermLoansMemberwtm:FirstCreditFacilityMemberwtm:OtherOperationsMember2021-09-300000776867wtm:FirstCreditFacilityMemberwtm:OtherOperationsMemberus-gaap:RevolvingCreditFacilityMember2021-09-300000776867wtm:SecondCreditFacilityMemberwtm:OtherOperationsMember2021-09-300000776867wtm:SecondCreditFacilityMemberwtm:OtherOperationsMemberwtm:TermLoanMember2021-09-300000776867wtm:DelayedDrawTermLoansMemberwtm:SecondCreditFacilityMemberwtm:OtherOperationsMember2021-09-300000776867wtm:SecondCreditFacilityMemberwtm:OtherOperationsMemberus-gaap:RevolvingCreditFacilityMember2021-09-300000776867wtm:OtherOperationsMemberwtm:ThirdCreditFacilityMember2021-09-300000776867wtm:OtherOperationsMemberus-gaap:RevolvingCreditFacilityMemberwtm:ThirdCreditFacilityMember2021-07-012021-09-300000776867wtm:OtherOperationsMemberus-gaap:RevolvingCreditFacilityMemberwtm:ThirdCreditFacilityMember2021-01-012021-09-300000776867wtm:OtherOperationsMemberwtm:TermLoanMemberwtm:ThirdCreditFacilityMember2021-07-012021-09-300000776867wtm:OtherOperationsMemberwtm:TermLoanMemberwtm:ThirdCreditFacilityMember2021-01-012021-09-300000776867wtm:OtherOperationsMemberwtm:TermLoanMemberwtm:ThirdCreditFacilityMember2021-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:InterestRateSwapMember2018-06-150000776867wtm:NSMInsuranceGroupMemberus-gaap:InterestRateSwapMember2021-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:InterestRateSwapMember2021-07-012021-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:InterestRateSwapMember2021-01-012021-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:InterestRateSwapMember2020-07-012020-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:InterestRateSwapMember2020-01-012020-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:InterestRateSwapMember2020-12-310000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberus-gaap:InterestRateCapMembercurrency:GBP2020-06-040000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMembercurrency:USDus-gaap:InterestRateCapMember2020-06-040000776867wtm:NSMInsuranceGroupMemberwtm:NSMBankFacilityMemberus-gaap:InterestRateCapMember2020-08-182020-08-180000776867wtm:NSMInsuranceGroupMemberus-gaap:InterestRateCapMember2021-01-012021-09-300000776867wtm:NSMInsuranceGroupMemberwtm:BritishSterlingPoundLondonInterbankOfferedRateLIBORMemberus-gaap:InterestRateCapMember2021-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:InterestRateCapMember2021-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:InterestRateCapMember2021-07-012021-09-300000776867wtm:NSMInsuranceGroupMemberus-gaap:InterestRateCapMember2020-12-310000776867wtm:HgGlobalMember2012-12-310000776867wtm:HgReMember2021-09-300000776867wtm:BamMemberwtm:FidusReLtd.Member2018-06-3000007768672018-04-012018-06-300000776867wtm:FidusReLtd.Memberwtm:BamMember2018-04-012018-06-300000776867wtm:BamMemberwtm:FidusReLtd.Membersrt:MaximumMember2018-06-300000776867wtm:BamMemberwtm:A2018CoveredPortfolioMemberwtm:FidusReLtd.Member2021-01-012021-09-300000776867wtm:BamMemberwtm:FidusReLtd.Member2021-03-310000776867wtm:FidusReLtd.Memberwtm:BamMember2021-01-012021-03-310000776867wtm:BamMemberwtm:FidusReLtd.Membersrt:MaximumMember2021-03-310000776867wtm:BamMemberwtm:FidusReLtd.Memberwtm:A2021CoveredPortfolioMember2021-01-012021-09-300000776867srt:MaximumMemberwtm:HgGlobalMemberwtm:BamMember2020-01-310000776867wtm:HgGlobalMember2021-01-012021-09-300000776867wtm:HgReMember2020-12-310000776867wtm:SeriesABAMSurplusNoteMemberwtm:HgGlobalMember2021-09-300000776867wtm:SeriesABAMSurplusNoteMemberwtm:HgGlobalMember2020-12-310000776867wtm:HgGlobalMember2021-09-300000776867wtm:HgGlobalMember2020-12-310000776867wtm:BamMember2021-09-300000776867wtm:BamMember2020-12-310000776867wtm:SurplusNoteMemberwtm:BamMemberus-gaap:UsTreasuryUstInterestRateMember2021-01-012021-09-300000776867srt:ScenarioForecastMemberwtm:SurplusNoteMemberwtm:BamMemberus-gaap:UsTreasuryUstInterestRateMember2021-12-310000776867wtm:SurplusNoteMemberwtm:BamMemberwtm:FixedinterestrateMember2021-09-300000776867wtm:SurplusNoteMemberwtm:BamMember2020-12-012020-12-310000776867wtm:BamMemberwtm:SupplementalTrustMember2020-12-012020-12-310000776867wtm:BamMemberwtm:SupplementalTrustMember2020-12-310000776867wtm:SurplusNoteMemberwtm:BamMember2020-12-310000776867wtm:SurplusNoteMemberwtm:BamMember2020-01-012020-01-310000776867wtm:BamMemberwtm:SupplementalTrustMember2020-01-012020-01-310000776867wtm:BamMemberwtm:SupplementalTrustMember2020-01-310000776867wtm:SurplusNoteMemberwtm:BamMember2020-01-310000776867wtm:SurplusNoteMemberwtm:BamMemberwtm:HgGlobalMember2021-09-300000776867wtm:SurplusNoteMemberwtm:BamMemberwtm:HgGlobalMember2020-12-310000776867wtm:BamMemberwtm:HgGlobalMember2021-09-300000776867wtm:BamMemberwtm:HgGlobalMember2020-12-31wtm:Contract0000776867wtm:BamMember2021-09-300000776867wtm:BamMember2020-12-310000776867wtm:BamMember2021-01-012021-09-300000776867wtm:BamMember2020-01-012020-12-310000776867wtm:HGBAMMember2021-07-012021-09-300000776867wtm:HGBAMMember2020-07-012020-09-300000776867wtm:HGBAMMember2021-01-012021-09-300000776867wtm:HGBAMMember2020-01-012020-09-300000776867wtm:BamMember2020-06-300000776867wtm:BamMemberwtm:FidusReLtd.Member2021-01-012021-01-310000776867wtm:BamMember2021-01-310000776867us-gaap:PerformanceSharesMemberwtm:WTMIncentivePlanMember2021-01-012021-09-300000776867us-gaap:PerformanceSharesMemberwtm:WTMIncentivePlanMembersrt:MinimumMember2021-01-012021-09-300000776867srt:MaximumMemberus-gaap:PerformanceSharesMemberwtm:WTMIncentivePlanMember2021-01-012021-09-300000776867us-gaap:PerformanceSharesMemberwtm:WTMIncentivePlanMember2021-06-300000776867us-gaap:PerformanceSharesMemberwtm:WTMIncentivePlanMember2020-06-300000776867us-gaap:PerformanceSharesMemberwtm:WTMIncentivePlanMember2020-12-310000776867us-gaap:PerformanceSharesMemberwtm:WTMIncentivePlanMember2019-12-310000776867us-gaap:PerformanceSharesMemberwtm:WTMIncentivePlanMember2021-07-012021-09-300000776867us-gaap:PerformanceSharesMemberwtm:WTMIncentivePlanMember2020-07-012020-09-300000776867us-gaap:PerformanceSharesMemberwtm:WTMIncentivePlanMember2020-01-012020-09-300000776867us-gaap:PerformanceSharesMemberwtm:WTMIncentivePlanMember2021-09-300000776867us-gaap:PerformanceSharesMemberwtm:WTMIncentivePlanMember2020-09-300000776867us-gaap:PerformanceSharesMemberwtm:RangeOfPerformanceCycleFrom20182020Memberwtm:WTMIncentivePlanMember2021-03-012021-03-310000776867us-gaap:PerformanceSharesMemberwtm:RangeOfPerformanceCyclePeriodOneMemberwtm:WTMIncentivePlanMember2020-03-012020-03-310000776867us-gaap:PerformanceSharesMemberwtm:RangeOfPerformanceCyclePeriodOneMemberwtm:WTMIncentivePlanMember2021-09-300000776867us-gaap:PerformanceSharesMemberwtm:PerformanceCyclePeriodTwoMemberwtm:WTMIncentivePlanMember2021-09-300000776867wtm:PerformanceCyclePeriodThreeMemberus-gaap:PerformanceSharesMemberwtm:WTMIncentivePlanMember2021-09-300000776867us-gaap:RestrictedStockMember2021-01-012021-09-300000776867us-gaap:RestrictedStockMemberwtm:WTMIncentivePlanMember2021-06-300000776867us-gaap:RestrictedStockMemberwtm:WTMIncentivePlanMember2020-06-300000776867us-gaap:RestrictedStockMemberwtm:WTMIncentivePlanMember2020-12-310000776867us-gaap:RestrictedStockMemberwtm:WTMIncentivePlanMember2019-12-310000776867us-gaap:RestrictedStockMemberwtm:WTMIncentivePlanMember2021-07-012021-09-300000776867us-gaap:RestrictedStockMemberwtm:WTMIncentivePlanMember2020-07-012020-09-300000776867us-gaap:RestrictedStockMemberwtm:WTMIncentivePlanMember2021-01-012021-09-300000776867us-gaap:RestrictedStockMemberwtm:WTMIncentivePlanMember2020-01-012020-09-300000776867us-gaap:RestrictedStockMemberwtm:WTMIncentivePlanMember2021-09-300000776867us-gaap:RestrictedStockMemberwtm:WTMIncentivePlanMember2020-09-300000776867wtm:HGBAMMember2021-09-300000776867wtm:OtherMember2021-09-300000776867wtm:HGBAMMember2020-12-310000776867wtm:OtherMember2020-12-310000776867wtm:HgGlobalMember2021-09-300000776867wtm:HgGlobalMember2020-12-310000776867wtm:ArkInsuranceHoldingsLimitedMember2021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMember2020-12-310000776867wtm:NSMInsuranceGroupMember2021-09-300000776867wtm:NSMInsuranceGroupMember2020-12-310000776867wtm:KuduInvestmentManagementLLCMember2021-09-300000776867wtm:KuduInvestmentManagementLLCMember2020-12-310000776867wtm:OtherOperationsMember2021-09-300000776867wtm:OtherOperationsMember2020-12-310000776867wtm:TotalNonControllingExcludingReciprocalsMember2021-09-300000776867wtm:TotalNonControllingExcludingReciprocalsMember2020-12-310000776867wtm:BuildAmericaMutualMember2021-09-300000776867wtm:BuildAmericaMutualMember2020-12-31wtm:segment0000776867wtm:HgGlobalBamMemberwtm:MediaAlphaMember2021-07-012021-09-300000776867wtm:MediaAlphaMemberwtm:ArkInsuranceHoldingsLimitedMember2021-07-012021-09-300000776867wtm:MediaAlphaMemberwtm:NSMInsuranceGroupMember2021-07-012021-09-300000776867wtm:MediaAlphaMemberwtm:KuduInvestmentManagementLLCMember2021-07-012021-09-300000776867wtm:MediaAlphaMember2021-07-012021-09-300000776867wtm:HgGlobalBamMemberwtm:MediaAlphaMember2020-07-012020-09-300000776867wtm:MediaAlphaMemberwtm:NSMInsuranceGroupMember2020-07-012020-09-300000776867wtm:MediaAlphaMemberwtm:KuduInvestmentManagementLLCMember2020-07-012020-09-300000776867wtm:MediaAlphaMember2020-07-012020-09-300000776867wtm:HgGlobalBamMemberwtm:MediaAlphaMember2021-01-012021-09-300000776867wtm:MediaAlphaMemberwtm:ArkInsuranceHoldingsLimitedMember2021-01-012021-09-300000776867wtm:MediaAlphaMemberwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867wtm:MediaAlphaMemberwtm:KuduInvestmentManagementLLCMember2021-01-012021-09-300000776867wtm:HgGlobalBamMemberwtm:MediaAlphaMember2020-01-012020-09-300000776867wtm:MediaAlphaMemberwtm:NSMInsuranceGroupMember2020-01-012020-09-300000776867wtm:MediaAlphaMemberwtm:KuduInvestmentManagementLLCMember2020-01-012020-09-300000776867wtm:HgGlobalBamMemberwtm:SpecialtyTransportationMember2021-07-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:SpecialtyTransportationMember2021-07-012021-09-300000776867wtm:SpecialtyTransportationMemberwtm:NSMInsuranceGroupMember2021-07-012021-09-300000776867wtm:SpecialtyTransportationMemberwtm:KuduInvestmentManagementLLCMember2021-07-012021-09-300000776867wtm:SpecialtyTransportationMemberwtm:OtherEntityMember2021-07-012021-09-300000776867wtm:SpecialtyTransportationMember2021-07-012021-09-300000776867wtm:HgGlobalBamMemberus-gaap:RealEstateMember2021-07-012021-09-300000776867us-gaap:RealEstateMemberwtm:ArkInsuranceHoldingsLimitedMember2021-07-012021-09-300000776867us-gaap:RealEstateMemberwtm:NSMInsuranceGroupMember2021-07-012021-09-300000776867us-gaap:RealEstateMemberwtm:KuduInvestmentManagementLLCMember2021-07-012021-09-300000776867us-gaap:RealEstateMemberwtm:OtherEntityMember2021-07-012021-09-300000776867us-gaap:RealEstateMember2021-07-012021-09-300000776867wtm:HgGlobalBamMemberwtm:SocialServicesMember2021-07-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:SocialServicesMember2021-07-012021-09-300000776867wtm:SocialServicesMemberwtm:NSMInsuranceGroupMember2021-07-012021-09-300000776867wtm:SocialServicesMemberwtm:KuduInvestmentManagementLLCMember2021-07-012021-09-300000776867wtm:SocialServicesMemberwtm:OtherEntityMember2021-07-012021-09-300000776867wtm:SocialServicesMember2021-07-012021-09-300000776867wtm:HgGlobalBamMemberwtm:PetMember2021-07-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:PetMember2021-07-012021-09-300000776867wtm:PetMemberwtm:NSMInsuranceGroupMember2021-07-012021-09-300000776867wtm:PetMemberwtm:KuduInvestmentManagementLLCMember2021-07-012021-09-300000776867wtm:PetMemberwtm:OtherEntityMember2021-07-012021-09-300000776867wtm:PetMember2021-07-012021-09-300000776867wtm:HgGlobalBamMembercountry:GB2021-07-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMembercountry:GB2021-07-012021-09-300000776867country:GBwtm:NSMInsuranceGroupMember2021-07-012021-09-300000776867country:GBwtm:KuduInvestmentManagementLLCMember2021-07-012021-09-300000776867wtm:OtherEntityMembercountry:GB2021-07-012021-09-300000776867country:GB2021-07-012021-09-300000776867wtm:HgGlobalBamMemberus-gaap:ServiceOtherMember2021-07-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberus-gaap:ServiceOtherMember2021-07-012021-09-300000776867us-gaap:ServiceOtherMemberwtm:NSMInsuranceGroupMember2021-07-012021-09-300000776867us-gaap:ServiceOtherMemberwtm:KuduInvestmentManagementLLCMember2021-07-012021-09-300000776867us-gaap:ServiceOtherMemberwtm:OtherEntityMember2021-07-012021-09-300000776867us-gaap:ServiceOtherMember2021-07-012021-09-300000776867wtm:HgGlobalBamMemberwtm:CommissionandOtherRevenueMember2021-07-012021-09-300000776867wtm:CommissionandOtherRevenueMemberwtm:ArkInsuranceHoldingsLimitedMember2021-07-012021-09-300000776867wtm:CommissionandOtherRevenueMemberwtm:NSMInsuranceGroupMember2021-07-012021-09-300000776867wtm:CommissionandOtherRevenueMemberwtm:KuduInvestmentManagementLLCMember2021-07-012021-09-300000776867wtm:CommissionandOtherRevenueMemberwtm:OtherEntityMember2021-07-012021-09-300000776867wtm:CommissionandOtherRevenueMember2021-07-012021-09-300000776867wtm:HgGlobalBamMemberus-gaap:ProductMember2021-07-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberus-gaap:ProductMember2021-07-012021-09-300000776867us-gaap:ProductMemberwtm:NSMInsuranceGroupMember2021-07-012021-09-300000776867us-gaap:ProductMemberwtm:KuduInvestmentManagementLLCMember2021-07-012021-09-300000776867us-gaap:ProductMemberwtm:OtherEntityMember2021-07-012021-09-300000776867us-gaap:ProductMember2021-07-012021-09-300000776867wtm:HgGlobalBamMemberwtm:SpecialtyTransportationMember2020-07-012020-09-300000776867wtm:SpecialtyTransportationMemberwtm:NSMInsuranceGroupMember2020-07-012020-09-300000776867wtm:SpecialtyTransportationMemberwtm:KuduInvestmentManagementLLCMember2020-07-012020-09-300000776867wtm:SpecialtyTransportationMemberwtm:OtherEntityMember2020-07-012020-09-300000776867wtm:SpecialtyTransportationMember2020-07-012020-09-300000776867wtm:HgGlobalBamMemberus-gaap:RealEstateMember2020-07-012020-09-300000776867us-gaap:RealEstateMemberwtm:NSMInsuranceGroupMember2020-07-012020-09-300000776867us-gaap:RealEstateMemberwtm:KuduInvestmentManagementLLCMember2020-07-012020-09-300000776867us-gaap:RealEstateMemberwtm:OtherEntityMember2020-07-012020-09-300000776867us-gaap:RealEstateMember2020-07-012020-09-300000776867wtm:HgGlobalBamMemberwtm:SocialServicesMember2020-07-012020-09-300000776867wtm:SocialServicesMemberwtm:NSMInsuranceGroupMember2020-07-012020-09-300000776867wtm:SocialServicesMemberwtm:KuduInvestmentManagementLLCMember2020-07-012020-09-300000776867wtm:SocialServicesMemberwtm:OtherEntityMember2020-07-012020-09-300000776867wtm:SocialServicesMember2020-07-012020-09-300000776867wtm:HgGlobalBamMemberwtm:PetMember2020-07-012020-09-300000776867wtm:PetMemberwtm:NSMInsuranceGroupMember2020-07-012020-09-300000776867wtm:PetMemberwtm:KuduInvestmentManagementLLCMember2020-07-012020-09-300000776867wtm:PetMemberwtm:OtherEntityMember2020-07-012020-09-300000776867wtm:PetMember2020-07-012020-09-300000776867wtm:HgGlobalBamMembercountry:GB2020-07-012020-09-300000776867country:GBwtm:NSMInsuranceGroupMember2020-07-012020-09-300000776867country:GBwtm:KuduInvestmentManagementLLCMember2020-07-012020-09-300000776867wtm:OtherEntityMembercountry:GB2020-07-012020-09-300000776867country:GB2020-07-012020-09-300000776867wtm:HgGlobalBamMemberus-gaap:ServiceOtherMember2020-07-012020-09-300000776867us-gaap:ServiceOtherMemberwtm:NSMInsuranceGroupMember2020-07-012020-09-300000776867us-gaap:ServiceOtherMemberwtm:KuduInvestmentManagementLLCMember2020-07-012020-09-300000776867us-gaap:ServiceOtherMemberwtm:OtherEntityMember2020-07-012020-09-300000776867us-gaap:ServiceOtherMember2020-07-012020-09-300000776867wtm:HgGlobalBamMemberwtm:CommissionandOtherRevenueMember2020-07-012020-09-300000776867wtm:CommissionandOtherRevenueMemberwtm:NSMInsuranceGroupMember2020-07-012020-09-300000776867wtm:CommissionandOtherRevenueMemberwtm:KuduInvestmentManagementLLCMember2020-07-012020-09-300000776867wtm:CommissionandOtherRevenueMemberwtm:OtherEntityMember2020-07-012020-09-300000776867wtm:CommissionandOtherRevenueMember2020-07-012020-09-300000776867wtm:HgGlobalBamMemberus-gaap:ProductMember2020-07-012020-09-300000776867us-gaap:ProductMemberwtm:NSMInsuranceGroupMember2020-07-012020-09-300000776867us-gaap:ProductMemberwtm:KuduInvestmentManagementLLCMember2020-07-012020-09-300000776867us-gaap:ProductMemberwtm:OtherEntityMember2020-07-012020-09-300000776867us-gaap:ProductMember2020-07-012020-09-300000776867wtm:HgGlobalBamMemberwtm:SpecialtyTransportationMember2021-01-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:SpecialtyTransportationMember2021-01-012021-09-300000776867wtm:SpecialtyTransportationMemberwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867wtm:SpecialtyTransportationMemberwtm:KuduInvestmentManagementLLCMember2021-01-012021-09-300000776867wtm:SpecialtyTransportationMemberwtm:OtherEntityMember2021-01-012021-09-300000776867wtm:SpecialtyTransportationMember2021-01-012021-09-300000776867wtm:HgGlobalBamMemberus-gaap:RealEstateMember2021-01-012021-09-300000776867us-gaap:RealEstateMemberwtm:ArkInsuranceHoldingsLimitedMember2021-01-012021-09-300000776867us-gaap:RealEstateMemberwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867us-gaap:RealEstateMemberwtm:KuduInvestmentManagementLLCMember2021-01-012021-09-300000776867us-gaap:RealEstateMemberwtm:OtherEntityMember2021-01-012021-09-300000776867us-gaap:RealEstateMember2021-01-012021-09-300000776867wtm:HgGlobalBamMemberwtm:SocialServicesMember2021-01-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:SocialServicesMember2021-01-012021-09-300000776867wtm:SocialServicesMemberwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867wtm:SocialServicesMemberwtm:KuduInvestmentManagementLLCMember2021-01-012021-09-300000776867wtm:SocialServicesMemberwtm:OtherEntityMember2021-01-012021-09-300000776867wtm:SocialServicesMember2021-01-012021-09-300000776867wtm:HgGlobalBamMemberwtm:PetMember2021-01-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberwtm:PetMember2021-01-012021-09-300000776867wtm:PetMemberwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867wtm:PetMemberwtm:KuduInvestmentManagementLLCMember2021-01-012021-09-300000776867wtm:PetMemberwtm:OtherEntityMember2021-01-012021-09-300000776867wtm:PetMember2021-01-012021-09-300000776867wtm:HgGlobalBamMembercountry:GB2021-01-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMembercountry:GB2021-01-012021-09-300000776867country:GBwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867country:GBwtm:KuduInvestmentManagementLLCMember2021-01-012021-09-300000776867wtm:OtherEntityMembercountry:GB2021-01-012021-09-300000776867country:GB2021-01-012021-09-300000776867wtm:HgGlobalBamMemberus-gaap:ServiceOtherMember2021-01-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberus-gaap:ServiceOtherMember2021-01-012021-09-300000776867us-gaap:ServiceOtherMemberwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867us-gaap:ServiceOtherMemberwtm:KuduInvestmentManagementLLCMember2021-01-012021-09-300000776867us-gaap:ServiceOtherMemberwtm:OtherEntityMember2021-01-012021-09-300000776867us-gaap:ServiceOtherMember2021-01-012021-09-300000776867wtm:HgGlobalBamMemberwtm:CommissionandOtherRevenueMember2021-01-012021-09-300000776867wtm:CommissionandOtherRevenueMemberwtm:ArkInsuranceHoldingsLimitedMember2021-01-012021-09-300000776867wtm:CommissionandOtherRevenueMemberwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867wtm:CommissionandOtherRevenueMemberwtm:KuduInvestmentManagementLLCMember2021-01-012021-09-300000776867wtm:CommissionandOtherRevenueMemberwtm:OtherEntityMember2021-01-012021-09-300000776867wtm:CommissionandOtherRevenueMember2021-01-012021-09-300000776867wtm:HgGlobalBamMemberus-gaap:ProductMember2021-01-012021-09-300000776867wtm:ArkInsuranceHoldingsLimitedMemberus-gaap:ProductMember2021-01-012021-09-300000776867us-gaap:ProductMemberwtm:NSMInsuranceGroupMember2021-01-012021-09-300000776867us-gaap:ProductMemberwtm:KuduInvestmentManagementLLCMember2021-01-012021-09-300000776867us-gaap:ProductMemberwtm:OtherEntityMember2021-01-012021-09-300000776867us-gaap:ProductMember2021-01-012021-09-300000776867wtm:HgGlobalBamMemberwtm:SpecialtyTransportationMember2020-01-012020-09-300000776867wtm:SpecialtyTransportationMemberwtm:NSMInsuranceGroupMember2020-01-012020-09-300000776867wtm:SpecialtyTransportationMemberwtm:KuduInvestmentManagementLLCMember2020-01-012020-09-300000776867wtm:SpecialtyTransportationMemberwtm:OtherEntityMember2020-01-012020-09-300000776867wtm:SpecialtyTransportationMember2020-01-012020-09-300000776867wtm:HgGlobalBamMemberus-gaap:RealEstateMember2020-01-012020-09-300000776867us-gaap:RealEstateMemberwtm:NSMInsuranceGroupMember2020-01-012020-09-300000776867us-gaap:RealEstateMemberwtm:KuduInvestmentManagementLLCMember2020-01-012020-09-300000776867us-gaap:RealEstateMemberwtm:OtherEntityMember2020-01-012020-09-300000776867us-gaap:RealEstateMember2020-01-012020-09-300000776867wtm:HgGlobalBamMemberwtm:SocialServicesMember2020-01-012020-09-300000776867wtm:SocialServicesMemberwtm:NSMInsuranceGroupMember2020-01-012020-09-300000776867wtm:SocialServicesMemberwtm:KuduInvestmentManagementLLCMember2020-01-012020-09-300000776867wtm:SocialServicesMemberwtm:OtherEntityMember2020-01-012020-09-300000776867wtm:SocialServicesMember2020-01-012020-09-300000776867wtm:HgGlobalBamMemberwtm:PetMember2020-01-012020-09-300000776867wtm:PetMemberwtm:NSMInsuranceGroupMember2020-01-012020-09-300000776867wtm:PetMemberwtm:KuduInvestmentManagementLLCMember2020-01-012020-09-300000776867wtm:PetMemberwtm:OtherEntityMember2020-01-012020-09-300000776867wtm:PetMember2020-01-012020-09-300000776867wtm:HgGlobalBamMembercountry:GB2020-01-012020-09-300000776867country:GBwtm:NSMInsuranceGroupMember2020-01-012020-09-300000776867country:GBwtm:KuduInvestmentManagementLLCMember2020-01-012020-09-300000776867wtm:OtherEntityMembercountry:GB2020-01-012020-09-300000776867country:GB2020-01-012020-09-300000776867wtm:HgGlobalBamMemberus-gaap:ServiceOtherMember2020-01-012020-09-300000776867us-gaap:ServiceOtherMemberwtm:NSMInsuranceGroupMember2020-01-012020-09-300000776867us-gaap:ServiceOtherMemberwtm:KuduInvestmentManagementLLCMember2020-01-012020-09-300000776867us-gaap:ServiceOtherMemberwtm:OtherEntityMember2020-01-012020-09-300000776867us-gaap:ServiceOtherMember2020-01-012020-09-300000776867wtm:HgGlobalBamMemberwtm:CommissionandOtherRevenueMember2020-01-012020-09-300000776867wtm:CommissionandOtherRevenueMemberwtm:NSMInsuranceGroupMember2020-01-012020-09-300000776867wtm:CommissionandOtherRevenueMemberwtm:KuduInvestmentManagementLLCMember2020-01-012020-09-300000776867wtm:CommissionandOtherRevenueMemberwtm:OtherEntityMember2020-01-012020-09-300000776867wtm:CommissionandOtherRevenueMember2020-01-012020-09-300000776867wtm:HgGlobalBamMemberus-gaap:ProductMember2020-01-012020-09-300000776867us-gaap:ProductMemberwtm:NSMInsuranceGroupMember2020-01-012020-09-300000776867us-gaap:ProductMemberwtm:KuduInvestmentManagementLLCMember2020-01-012020-09-300000776867us-gaap:ProductMemberwtm:OtherEntityMember2020-01-012020-09-300000776867us-gaap:ProductMember2020-01-012020-09-300000776867wtm:KuduInvestmentsMember2021-09-300000776867wtm:KuduInvestmentsMember2020-12-310000776867wtm:MediaAlphaMember2021-09-300000776867wtm:MediaAlphaMember2020-12-310000776867wtm:DavidShieldPassportCardMember2020-12-310000776867wtm:ElementumHoldingsL.P.Member2021-09-300000776867wtm:ElementumHoldingsL.P.Member2020-12-310000776867wtm:OtherInvestmentSectorMember2021-09-300000776867wtm:OtherInvestmentSectorMember2020-12-310000776867us-gaap:EquityMethodInvestmentsMember2021-09-300000776867us-gaap:EquityMethodInvestmentsMember2020-12-310000776867us-gaap:EquityMethodInvesteeMember2021-07-012021-09-300000776867us-gaap:EquityMethodInvesteeMember2021-01-012021-09-300000776867us-gaap:EquityMethodInvesteeMember2020-07-012020-09-300000776867us-gaap:EquityMethodInvesteeMember2020-01-012020-09-300000776867wtm:MediaAlphaMember2021-09-300000776867wtm:MediaAlphaMember2020-12-310000776867wtm:MediaAlphaMember2021-07-012021-09-300000776867wtm:MediaAlphaMember2020-07-012020-09-300000776867wtm:MediaAlphaMember2021-01-012021-09-300000776867wtm:MediaAlphaMember2020-01-012020-09-300000776867wtm:KuduInvestmentsMembersrt:MinimumMember2021-09-300000776867wtm:KuduInvestmentsMembersrt:MaximumMember2021-09-300000776867wtm:KuduInvestmentsMembersrt:MinimumMember2020-12-310000776867wtm:KuduInvestmentsMembersrt:MaximumMember2020-12-310000776867wtm:Ark2007NotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2021-09-300000776867wtm:Ark2007NotesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2021-09-300000776867wtm:Ark2007NotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310000776867wtm:Ark2007NotesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310000776867us-gaap:EstimateOfFairValueFairValueDisclosureMemberwtm:Ark2021NotesMember2021-09-300000776867wtm:Ark2021NotesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2021-09-300000776867us-gaap:EstimateOfFairValueFairValueDisclosureMemberwtm:Ark2021NotesMember2020-12-310000776867wtm:Ark2021NotesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310000776867wtm:NSMBankFacilityMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2021-09-300000776867wtm:NSMBankFacilityMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2021-09-300000776867wtm:NSMBankFacilityMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310000776867wtm:NSMBankFacilityMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310000776867us-gaap:EstimateOfFairValueFairValueDisclosureMemberwtm:OtherNSMMember2021-09-300000776867wtm:OtherNSMMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2021-09-300000776867us-gaap:EstimateOfFairValueFairValueDisclosureMemberwtm:OtherNSMMember2020-12-310000776867wtm:OtherNSMMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310000776867wtm:KuduCreditFacilityMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2021-09-300000776867wtm:KuduCreditFacilityMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2021-09-300000776867wtm:KuduCreditFacilityMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310000776867wtm:KuduCreditFacilityMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310000776867us-gaap:EstimateOfFairValueFairValueDisclosureMemberwtm:KuduBankFacilityMember2021-09-300000776867wtm:KuduBankFacilityMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2021-09-300000776867us-gaap:EstimateOfFairValueFairValueDisclosureMemberwtm:KuduBankFacilityMember2020-12-310000776867wtm:KuduBankFacilityMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310000776867us-gaap:EstimateOfFairValueFairValueDisclosureMemberwtm:OtherOperationsMember2021-09-300000776867wtm:OtherOperationsMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2021-09-300000776867us-gaap:EstimateOfFairValueFairValueDisclosureMemberwtm:OtherOperationsMember2020-12-310000776867wtm:OtherOperationsMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310000776867us-gaap:SegmentDiscontinuedOperationsMemberwtm:SiriusGroupMember2021-01-012021-03-310000776867wtm:SiriusGroupMemberus-gaap:DiscontinuedOperationsDisposedOfBySaleMember2020-12-310000776867wtm:SiriusGroupMemberus-gaap:DiscontinuedOperationsDisposedOfBySaleMember2021-01-012021-09-300000776867wtm:SiriusGroupMemberus-gaap:DiscontinuedOperationsDisposedOfBySaleMemberus-gaap:ForeignCurrencyGainLossMember2021-01-012021-09-300000776867us-gaap:SegmentDiscontinuedOperationsMember2021-07-012021-09-300000776867us-gaap:SegmentDiscontinuedOperationsMember2020-07-012020-09-300000776867us-gaap:SegmentDiscontinuedOperationsMember2021-01-012021-09-300000776867us-gaap:SegmentDiscontinuedOperationsMember2020-01-012020-09-30
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-Q
☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the period ended September 30, 2021
OR
☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from to
Commission file number 1-8993
WHITE MOUNTAINS INSURANCE GROUP, LTD.
(Exact name of Registrant as specified in its charter)
| | | | | | | | |
Bermuda | | |
(State or other jurisdiction of incorporation or organization) | | 94-2708455 |
23 South Main Street, Suite 3B | | (I.R.S. Employer Identification No.) |
Hanover, | | 03755-2053 |
New Hampshire | | (Zip Code) |
(Address of principal executive offices) | | |
Registrant’s telephone number, including area code: (603) 640-2200
Securities registered pursuant to Section 12(b) of the Act:
| | | | | | | | | | | | | | |
Title of each class | | Trading Symbol(s) | | Name of each exchange on which registered |
Common Shares, par value $1.00 | | WTM | | New York Stock Exchange |
per share | | | | Bermuda Stock Exchange |
Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ý No ☐
Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit such files). Yes ý No ☐
Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer”, “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.
| | | | | | | | | | | | | | | | | | | | | | | |
Large accelerated filer | ý | Accelerated filer | ☐ | Non-accelerated filer | ☐ |
Smaller reporting company | ☐ | Emerging growth company | ☐ | |
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o
Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ý
As of November 5, 2021, 3,017,772 common shares with a par value of $1.00 per share were outstanding (which includes 37,850 restricted common shares that were not vested at such date).
WHITE MOUNTAINS INSURANCE GROUP, LTD.
Table of Contents
| | | | | | | | |
| | Page No. |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| Three and Nine Months Ended September 30, 2021 and 2020 | |
| | |
| | |
| Three and Nine Months Ended September 30, 2021 and 2020 | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| |
| | |
| |
Part I.FINANCIAL INFORMATION.
Item 1.Financial Statements
WHITE MOUNTAINS INSURANCE GROUP, LTD.
CONSOLIDATED BALANCE SHEETS
| | | | | | | | | | | | | | |
| | September 30, 2021 | | December 31, 2020 |
Millions, except share and per share amounts | | |
Assets | | Unaudited | | |
Financial Guarantee (HG Global/BAM) | | | | |
Fixed maturity investments, at fair value | | $ | 898.4 | | | $ | 859.5 | |
Short-term investments, at fair value | | 50.3 | | | 60.4 | |
Total investments | | 948.7 | | | 919.9 | |
Cash | | 21.8 | | | 42.8 | |
Insurance premiums receivable | | 6.9 | | | 6.9 | |
Deferred acquisition costs | | 31.7 | | | 27.8 | |
| | | | |
| | | | |
Other assets | | 18.7 | | | 20.4 | |
Total Financial Guarantee assets | | 1,027.8 | | | 1,017.8 | |
P&C Insurance and Reinsurance (Ark) | | | | |
Fixed maturity investments, at fair value | | 618.1 | | | — | |
Common equity securities, at fair value | | 159.6 | | | — | |
Short-term investments, at fair value | | 396.5 | | | — | |
Other long-term investments | | 320.6 | | | — | |
Total investments | | 1,494.8 | | | — | |
Cash | | 116.5 | | | — | |
Reinsurance recoverables | | 465.6 | | | — | |
Insurance premiums receivable | | 482.3 | | | — | |
Ceded unearned premiums | | 92.1 | | | — | |
Deferred acquisition costs and value of in-force business acquired | | 127.8 | | | — | |
| | | | |
Goodwill and other intangible assets | | 292.5 | | | — | |
Other assets | | 61.3 | | | — | |
Total P&C Insurance and Reinsurance assets | | 3,132.9 | | | — | |
Specialty Insurance Distribution (NSM) | | | | |
| | | | |
Cash (restricted $92.2 and $78.4) | | 126.5 | | | 126.5 | |
Premiums and commissions receivable | | 78.8 | | | 76.7 | |
Goodwill and other intangible assets | | 734.8 | | | 736.8 | |
Other assets | | 56.4 | | | 59.6 | |
Total Specialty Insurance Distribution assets | | 996.5 | | | 999.6 | |
Asset Management (Kudu) | | | | |
Short-term investments, at fair value | | .1 | | | .1 | |
Other long-term investments | | 604.7 | | | 400.6 | |
Total investments | | 604.8 | | | 400.7 | |
Cash (restricted $4.5 and $0.0) | | 14.8 | | | 7.8 | |
Accrued investment income | | 9.0 | | | 9.8 | |
Goodwill and other intangible assets | | 9.0 | | | 9.2 | |
Other assets | | 8.4 | | | 2.7 | |
Total Asset Management assets | | 646.0 | | | 430.2 | |
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |
Other Operations | | | | |
Fixed maturity investments, at fair value | | 316.4 | | | 347.7 | |
Short-term investments, at fair value | | 162.6 | | | 82.4 | |
| | | | |
Investment in MediaAlpha, at fair value | | 316.4 | | | 802.2 | |
Other long-term investments | | 360.2 | | | 386.2 | |
Total investments | | 1,155.6 | | | 1,618.5 | |
Cash | | 31.1 | | | 34.1 | |
Cash pre-funded/placed in escrow for Ark Transaction | | — | | | 646.3 | |
| | | | |
| | | | |
Goodwill and other intangible assets | | 48.7 | | | 36.4 | |
Other assets | | 75.0 | | | 48.5 | |
| | | | |
Total Other Operations assets | | 1,310.4 | | | 2,383.8 | |
Total assets | | $ | 7,113.6 | | | $ | 4,831.4 | |
See Notes to Consolidated Financial Statements
CONSOLIDATED BALANCE SHEETS (CONTINUED)
| | | | | | | | | | | | | | |
| | September 30, 2021 | | December 31, 2020 |
Millions, except share and per share amounts | | |
Liabilities | | Unaudited | | |
Financial Guarantee (HG Global/BAM) | | | | |
Unearned insurance premiums | | $ | 257.0 | | | $ | 237.5 | |
Accrued incentive compensation | | 21.0 | | | 25.7 | |
| | | | |
Other liabilities | | 32.5 | | | 28.3 | |
Total Financial Guarantee liabilities | | 310.5 | | | 291.5 | |
P&C Insurance and Reinsurance (Ark) | | | | |
Loss and loss adjustment expense reserves | | 890.9 | | | — | |
Unearned insurance premiums | | 596.6 | | | — | |
Debt | | 200.7 | | | — | |
Reinsurance payable | | 481.4 | | | — | |
Contingent consideration | | 24.0 | | | — | |
| | | | |
Other liabilities | | 87.4 | | | — | |
Total P&C Insurance and Reinsurance liabilities | | 2,281.0 | | | — | |
Specialty Insurance Distribution (NSM) | | | | |
Debt | | 295.0 | | | 272.6 | |
| | | | |
Premiums payable | | 132.5 | | | 113.4 | |
| | | | |
Contingent consideration | | 6.7 | | | 14.6 | |
| | | | |
Other liabilities | | 84.2 | | | 91.2 | |
Total Specialty Insurance Distribution liabilities | | 518.4 | | | 491.8 | |
Asset Management (Kudu) | | | | |
| | | | |
| | | | |
Debt | | 195.6 | | | 86.3 | |
| | | | |
Other liabilities | | 40.2 | | | 10.0 | |
Total Asset Management liabilities | | 235.8 | | | 96.3 | |
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |
Other Operations | | | | |
Debt | | 19.1 | | | 17.5 | |
| | | | |
Accrued incentive compensation | | 44.7 | | | 70.1 | |
| | | | |
Other liabilities | | 49.8 | | | 46.3 | |
| | | | |
Total Other Operations liabilities | | 113.6 | | | 133.9 | |
Total liabilities | | 3,459.3 | | | 1,013.5 | |
Equity | | | | |
White Mountains’s common shareholders’ equity | | | | |
White Mountains’s common shares at $1 par value per share—authorized 50,000,000 shares; issued and outstanding 3,029,620 and 3,102,011 shares and paid-in surplus | | 3.0 | | | 3.1 | |
Paid-in surplus | | 583.2 | | 592.1 |
Retained earnings | | 2,935.3 | | | 3,311.2 | |
Accumulated other comprehensive gain (loss), after-tax: | | | | |
Net unrealized foreign currency translation and interest rate swap gains (losses) | | .2 | | | (.4) | |
| | | | |
Total White Mountains’s common shareholders’ equity | | 3,521.7 | | | 3,906.0 | |
Non-controlling interests | | 132.6 | | | (88.1) | |
Total equity | | 3,654.3 | | | 3,817.9 | |
Total liabilities and equity | | $ | 7,113.6 | | | $ | 4,831.4 | |
See Notes to Consolidated Financial Statements
WHITE MOUNTAINS INSURANCE GROUP, LTD.
CONSOLIDATED STATEMENTS OF OPERATIONS
(Unaudited)
| | | | | | | | | | | | | | | | | | | | | | | | | | |
| | Three Months Ended September 30, | | Nine Months Ended September 30, |
Millions | | 2021 | | 2020 | | 2021 | | 2020 |
Revenues: | | | | | | | | |
Financial Guarantee (HG Global/BAM) | | | | | | | | |
Earned insurance premiums | | $ | 6.7 | | | $ | 6.2 | | | $ | 19.6 | | | $ | 17.2 | |
Net investment income | | 4.4 | | | 4.7 | | | 13.2 | | | 15.1 | |
Net realized and unrealized investment (losses) gains | | (4.0) | | | 3.2 | | | (15.6) | | | 23.7 | |
Other revenues | | .3 | | | .4 | | | .9 | | | 2.1 | |
Total Financial Guarantee revenues | | 7.4 | | | 14.5 | | | 18.1 | | | 58.1 | |
| | | | | | | | |
P&C Insurance and Reinsurance (Ark) | | | | | | | | |
Earned insurance premiums | | 213.4 | | | — | | | 435.8 | | | — | |
Net investment income | | .6 | | | — | | | 1.8 | | | — | |
Net realized and unrealized investment gains | | .3 | | | — | | | 10.3 | | | — | |
Other revenues | | 3.4 | | | — | | | 9.4 | | | — | |
Total P&C Insurance and Reinsurance revenues | | 217.7 | | | — | | | 457.3 | | | — | |
| | | | | | | | |
Specialty Insurance Distribution (NSM) | | | | | | | | |
Commission revenues | | 67.0 | | | 58.2 | | | 194.6 | | | 174.2 | |
| | | | | | | | |
Other revenues | | 15.3 | | | 12.5 | | | 46.8 | | | 37.6 | |
Total Specialty Insurance Distribution revenues | | 82.3 | | | 70.7 | | | 241.4 | | |