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CONSOLIDATED BALANCE SHEETS (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Assets    
Fixed maturity investments, at fair value $ 5,411.3 $ 6,221.9
Short-term investments, at amortized cost (which approximates fair value) 877.5 846.0
Common equity securities, at fair value 868.7 755.0
Convertible fixed maturity investments, at fair value 152.8 143.8
Other long-term investments 306.7 301.3
Total investments 7,617.0 8,268.0
Cash (restricted: $360.1 and $453.5) 605.4 705.4
Reinsurance recoverable on unpaid losses 2,465.4 2,507.3
Reinsurance recoverable on paid losses 39.1 30.5
Insurance and reinsurance premiums receivable 737.3 489.2
Funds held by ceding companies 111.1 106.5
Investments in unconsolidated affiliates 294.9 275.3
Deferred acquisition costs 198.8 187.0
Deferred tax asset 524.7 536.9
Ceded unearned insurance and reinsurance premiums 145.5 87.3
Accrued investment income 52.0 51.4
Accounts receivable on unsettled investment sales 6.5 4.7
Other assets 580.9 681.9
Assets held for sale   132.6
Total assets 13,378.6 14,064.0
Liabilities    
Loss and loss adjustment expense reserves 5,510.8 5,702.3
Unearned insurance and reinsurance premiums 1,074.4 846.9
Variable annuity benefit guarantee 548.5 768.5
Debt 677.2 677.5
Deferred tax liability 384.1 365.5
Accrued incentive compensation 90.0 187.9
Ceded reinsurance payable 194.0 134.6
Funds held under reinsurance treaties 45.2 42.9
Accounts payable on unsettled investment purchases 103.5 34.6
Other liabilities 441.4 527.8
Liabilities held for sale   107.6
Total liabilities 9,069.1 9,396.1
Equity    
White Mountains' common shares at $1 par value per share - authorized 50,000,000 shares; issued and outstanding 6,638,873 and 7,577,855 shares 6.6 7.6
Paid-in surplus 1,099.5 1,253.7
Retained earnings 2,553.7 2,789.7
Accumulated other comprehensive income, after-tax:    
Equity in net unrealized losses from investments in unconsolidated affiliates (1.2)  
Net unrealized foreign currency translation gains 69.4 46.1
Pension liability and other (9.2) (9.4)
Total White Mountains' common shareholders' equity 3,718.8 4,087.7
Noncontrolling interests    
Noncontrolling interest - OneBeacon Ltd. 281.9 273.1
Noncontrolling interest - SIG Preference Shares 250.0 250.0
Noncontrolling interest - other 58.8 57.1
Total noncontrolling interests 590.7 580.2
Total equity 4,309.5 4,667.9
Total liabilities and equity $ 13,378.6 $ 14,064.0