CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues:
Earned insurance and reinsurance premiums	$ 497.5	$ 510.5	$ 992.9	$ 1,008.5
Net investment income	28.7	40.4	57.2	82.2
Net realized and unrealized investment (losses) gains	(37.3)	(8.1)	37.9	50.5
Other revenue	0.4	(0.5)	28.7	30.7
Total revenues	489.3	542.3	1,116.7	1,171.9
Expenses:
Loss and loss adjustment expenses	274.6	263.9	518.9	513.7
Insurance and reinsurance acquisition expenses	76.1	109.5	174.3	218.6
Other underwriting expenses	84.5	78.3	163.6	151.8
General and administrative expenses	40.2	42.1	84.0	87.6
Interest expense on debt	10.3	10.9	20.5	21.8
Total expenses	485.7	504.7	961.3	993.5
Pre-tax income from continuing operations	3.6	37.6	155.4	178.4
Income tax benefit (expense)	0.6	(6.4)	(41.0)	(37.5)
Net income from continuing operations	4.2	31.2	114.4	140.9
Net gain (loss) income from discontinued operations, net of tax	3.9	0.5	4.4	(8.8)
Income before equity in earnings of unconsolidated affiliates	8.1	31.7	118.8	132.1
Equity in earnings of unconsolidated affiliates, net of tax	7.1	6.5	16.3	16.7
Net income	15.2	38.2	135.1	148.8
Net loss (income) attributable to non-controlling interests	11.1	(12.1)	11.6	(28.9)
Net income attributable to White Mountains’ common shareholders	26.3	26.1	146.7	119.9
Other comprehensive income, net of tax:
Change in equity in net unrealized (losses) gains from investments in unconsolidated affiliates	(66.0)	28.2	(74.0)	27.0
Change in foreign currency translation and other	(34.6)	(29.8)	(38.3)	(6.3)
Comprehensive (loss) income	(74.3)	24.5	34.4	140.6
Comprehensive income attributable to non-controlling interests	0	0	0	0
Comprehensive (loss) income attributable to White Mountains’ common shareholders	$ (74.3)	$ 24.5	$ 34.4	$ 140.6
Basic income (loss) per share
Continuing operations	$ 3.62	$ 3.85	$ 22.84	$ 18.28
Discontinued operations	$ 0.64	$ 0.07	$ 0.71	$ (1.25)
Total consolidated operations	$ 4.26	$ 3.92	$ 23.55	$ 17.03
Diluted income (loss) per share
Continuing operations	$ 3.62	$ 3.85	$ 22.84	$ 18.28
Discontinued operations	$ 0.64	$ 0.07	$ 0.71	$ (1.25)
Total consolidated operations	$ 4.26	$ 3.92	$ 23.55	$ 17.03
Dividends declared per White Mountains’ common share	$ 0	$ 0	$ 1	$ 1