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Document and Entity Information
Financial Statements
CONSOLIDATED BALANCE SHEETS
CONSOLIDATED BALANCE SHEETS (Parenthetical)
CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited)
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)
CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited)
CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)
CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)
Notes to Financial Statements
Basis of Presentation and Significant Accouting Policies
Significant Transactions
Investment Securities
Goodwill and Other Intangible Assets
Debt
Income Taxes
Derivatives
Municipal Bond Guarantee
Investments in Unconsolidated Entities
Earnings Per Share
Employee Share-Based Incentive Compensation Plans
Leases
Non-controlling Interests
Segment Information
Fair Value of Financial Instruments
Commitments and Contingencies
Held for Sale and Discontinued Operations
Subsequent Events
Accounting Policies
Basis of Presentation and Significant Accouting Policies (Policies)
Notes Tables
Investment Securities (Tables)
Goodwill and Other Intangible Assets (Tables)
Debt (Tables)
Municipal Bond Guarantee (Tables)
Investments in Unconsolidated Entities (Tables)
Earnings Per Share (Tables)
Employee Share-Based Incentive Compensation Plans (Tables)
Leases (Tables)
Non-controlling Interests (Tables)
Segment Information (Tables)
Fair Value of Financial Instruments (Tables)
Held for Sale and Discontinued Operations (Tables)
Notes Details
Basis of Presentation and Significant Accouting Policies (Basis of Presentation) (Details)
Significant Transactions (Details)
Investment Securities (Net Investment Income) (Details)
Investment Securities (Net Realized and Unrealized Investment Gains (Losses)) (Details)
Investment Securities (Net Unrealized Investment Gains (Losses)) (Details)
Investment Securities (Investment gains (losses) for Level 3) (Details)
Investment Securities (Investment Holdings Fixed Maturity Table) (Details)
Investment Securities (Investment Holding Common Equities/ Other Investments) (Details)
Investment Securities (Other long-term investments) (Details)
Investment Securities (Hedge Funds and Private Equity Funds) (Details)
Investment Securities (Fair Value of Hedge Funds and Private Equity Funds) (Details)
Investment Securities (Investments In Private Equity Funds Subject to Lock-Up Periods) (Details)
Investment Securities (Restrictions on Redemption Frequency and Advance Notice Requirements) (Details)
Investment Securities (Insurance-Linked Securities Funds) (Details)
Investment Securities (Fair Value Measurements) (Details)
Investment Securities (Fair Value Measurement by Level) (Details)
Investment Securities (Debt securities issued by corporation) (Details)
Investment Securities (Mortgage-backed Asset Securities Table) (Details)
Investment Securities (Rollforward of Fair Value Measurements by Level) (Details)
Investment Securities (Significant Unobservable Inputs) (Details)
Goodwill and Other Intangible Assets - Fair Value of Goodwill and Other Intangible Assets (Details)
Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets Rollforward (Details)
Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets Footnotes (Details)
Debt - Narrative (Details)
Income Taxes (Details)
Derivatives - NSM Interest Rate Swap and Cap (Details)
Municipal Bond Guarantee - Narrative (Details)
Municipal Bond Guarantee - Schedule of Net Written Premiums (Details)
Investments in Unconsolidated Entities (Details)
Investments in Unconsolidated Entities - White Mountain's Investments (Details)
Investments in Unconsolidated Entities - Narrative (Details)
Earnings Per Share (Details)
Earnings Per Share - Undistributed Net Earnings (Details)
Employee Share-Based Incentive Compensation Plans (Performance Shares) (Details)
Employee Share-Based Incentive Compensation Plans (Performance Shares Granted Under the WTM Incentive Plan) (Details)
Employee Share-Based Incentive Compensation Plans (Restricted Shares) (Details)
Leases - Narrative (Details)
Leases - Schedule of Lease Cost (Details)
Leases - Schedule of Future Minimum Payments on Operating Leases (Details)
Leases - Schedule of Right-of-Use Assets and Lease Liabilities (Details)
Non-controlling Interests (Details)
Segment Information (Details)
Fair Value of Financial Instruments (Details)
Commitments and Contingencies (Details)
Held for Sale and Discontinued Operations - (Details)
Held for Sale and Discontinued Operations - EPS (Details)
All Reports