CONSOLIDATED BALANCE SHEETS (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Assets
Fixed maturity investments, at fair value	$ 5,558.9	$ 5,786.1
Short-term investments, at amortized cost (which approximates fair value)	813.5	975.3
Common equity securities, at fair value	703.8	667.0
Convertible fixed maturity investments, at fair value	119.7	143.0
Other long-term investments	333.3	372.1
Total investments	7,529.2	7,943.5
Cash (restricted: $345.9 and $286.7)	483.7	395.0
Reinsurance recoverable on unpaid losses	2,193.1	2,344.0
Reinsurance recoverable on paid losses	44.5	63.1
Insurance and reinsurance premiums receivable	672.0	532.5
Funds held by ceding companies	135.8	118.7
Investments in unconsolidated affiliates	422.9	389.7
Deferred acquisition costs	194.1	176.1
Deferred tax asset	407.4	431.9
Ceded unearned insurance and reinsurance premiums	141.3	184.0
Accrued investment income	61.9	63.3
Accounts receivable on unsettled investment sales	23.4	39.5
Other assets	679.3	730.0
Assets held for sale	1,213.9	1,122.8
Total assets	14,202.5	14,534.1
Liabilities
Loss and loss adjustment expense reserves	5,642.4	5,736.8
Unearned insurance and reinsurance premiums	1,033.8	938.7
Debt	669.0	818.8
Deferred tax liability	374.2	373.2
Accrued incentive compensation	153.3	157.4
Funds held under reinsurance treaties	39.5	85.8
Ceded reinsurance payable	160.6	221.1
Accounts payable on unsettled investment purchases	44.9	22.3
Other liabilities	1,089.1	1,167.7
Liabilities held for sale	779.9	751.5
Total liabilities	9,986.7	10,273.3
White Mountains' common shareholders' equity
White Mountains' common shares at $1 par value per share - authorized 50,000,000 shares; issued and outstanding 7,958,589 and 8,194,925 shares	8.0	8.2
Paid-in surplus	1,313.5	1,350.8
Retained earnings	2,102.0	2,175.6
Accumulated other comprehensive income, after-tax:
Equity in unrealized gains from investments in unconsolidated affiliates	80.6	58.5
Net unrealized foreign currency translation gains	117.6	61.4
Other	(1.2)	(1.5)
Total White Mountains' common shareholders' equity	3,620.5	3,653.0
Noncontrolling interests
Noncontrolling interest - OneBeacon Ltd.	282.6	295.0
Noncontrolling interest - WMRe Preference Shares	250.0	250.0
Noncontrolling interest - consolidated limited partnerships and A.W.G Dewar	62.7	62.8
Total noncontrolling interests	595.3	607.8
Total equity	4,215.8	4,260.8
Total liabilities and equity	$ 14,202.5	$ 14,534.1