CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets
Fixed maturity investments, at fair value	$ 4,912.4	$ 6,221.9
Short-term investments, at amortized cost (which approximates fair value)	917.3	846.0
Common equity securities, at fair value	1,004.8	755.0
Convertible fixed maturity investments, at fair value	142.0	143.8
Other long-term investments	307.1	301.3
Total investments	7,283.6	8,268.0
Cash (restricted: $341.7 and $453.5)	549.2	705.4
Reinsurance recoverable on unpaid losses	356.8	2,507.3
Reinsurance recoverable on paid losses	14.8	30.5
Insurance and reinsurance premiums receivable	678.1	489.2
Funds held by ceding companies	102.7	106.5
Investments in unconsolidated affiliates	376.3	275.3
Deferred acquisition costs	211.3	187.0
Deferred Income Tax Assets	555.0	536.9
Ceded unearned insurance and reinsurance premiums	113.6	87.3
Accrued investment income	45.5	51.4
Accounts receivable on unsettled investment sales	167.2	4.7
Other assets	626.5	681.9
Assets held for sale	2,388.2	132.6
Total assets held for sale	13,468.8	14,064.0
Liabilities
Loss and loss adjustment expense reserves	3,059.8	5,702.3
Unearned insurance and reinsurance premiums	1,067.1	846.9
Variable annuity benefit guarantee	672.4	768.5
Debt	676.6	677.5
Deferred tax liability	399.7	365.5
Accrued incentive compensation	144.7	187.9
Ceded reinsurance payable	138.6	134.6
Funds held under reinsurance treaties	33.8	42.9
Accounts payable on unsettled investment purchases	47.7	34.6
Other liabilities	461.8	527.8
Liabilities held for sale	2,388.2	107.6
Total liabilities	9,090.4	9,396.1
Equity
White Mountains' common shares at $1 par value per share - authorized 50,000,000 shares; issued and outstanding 6,583,653 and 7,577,855 shares	6.6	7.6
Paid-in surplus	1,095.6	1,253.7
Retained earnings	2,577.4	2,789.7
Accumulated other comprehensive income, after-tax:
Equity in net unrealized losses from investments in unconsolidated affiliates	59.3	0
Net unrealized foreign currency translation gains	80.8	46.1
Pension liability and other	(10.4)	(9.4)
Total White Mountains' common shareholders' equity	3,809.3	4,087.7
Noncontrolling interests
Noncontrolling interest - OneBeacon Ltd.	259.7	273.1
Noncontrolling interest - SIG Preference Shares	250.0	250.0
Noncontrolling Interest Subsidiary HG Global	16.6	0
Noncontrolling Interest Subsidiary BAM	(18.0)	0
Noncontrolling interest - other	60.8	57.1
Total noncontrolling interests	569.1	580.2
Total equity	4,378.4	4,667.9
Total liabilities and equity	$ 13,468.8	$ 14,064.0