CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Earned insurance and reinsurance premiums	$ 2,058.9	$ 1,987.3	$ 2,063.6
Net investment income	105.0	110.9	153.6
Net realized and unrealized investment gains	283.9	161.7	118.2
Other revenue	62.4	57.5	100.3
Total revenues	2,510.2	2,317.4	2,435.7
Expenses
Loss and loss adjustment expenses	1,169.3	1,040.5	1,193.9
Insurance and reinsurance acquisition expenses	399.8	376.9	430.2
Other underwriting expenses	309.3	331.3	321.8
General and administrative expenses	288.2	181.3	182.2
Interest expense on debt	41.9	42.5	44.8
Total expenses	2,208.5	1,972.5	2,172.9
Pre-tax income	301.7	344.9	262.8
Income tax (expense) benefit	(53.3)	(76.6)	15.7
Net income from continuing operations	248.4	268.3	278.5
(Loss) gain on sale of discontinued operations, net of tax	(1.6)	46.6	(91.0)
Net loss from discontinued operations, net of tax	(1.8)	(42.1)	(24.0)
Income before equity in earnings of unconsolidated affiliates	245.0	272.8	163.5
Equity in earnings of unconsolidated affiliates, net of tax	45.6	36.6	29.9
Net income	290.6	309.4	193.4
Net loss attributable to non-controlling interests	22.1	12.4	14.0
Net income attributable to White Mountains’s common shareholders	312.7	321.8	207.4
Other comprehensive income, net of tax:
Change in equity in net unrealized gains (losses) from investments in Symetra common shares, net of tax	75.3	(98.1)	57.7
Change in foreign currency translation, net of tax	(168.5)	2.7	39.6
Net change in pension liability and other, net of tax	(11.7)	20.8	(2.9)
Comprehensive income	207.8	247.2	301.8
Comprehensive loss (income) attributable to non-controlling interests	3.3	(5.2)	0.8
Comprehensive income attributable to White Mountains’s common shareholders	$ 211.1	$ 242.0	$ 302.6
Basic earnings (loss) per share
Continuing operations	$ 51.77	$ 51.15	$ 47.41
Discontinued operations	$ (0.56)	$ 0.74	$ (16.91)
Total consolidated operations	$ 51.21	$ 51.89	$ 30.50
Diluted earnings (loss) per share
Continuing operations	$ 51.77	$ 51.15	$ 47.41
Discontinued operations	$ (0.56)	$ 0.74	$ (16.91)
Total consolidated operations	$ 51.21	$ 51.89	$ 30.50
Dividends declared and paid per White Mountains’s common share	$ 1.00	$ 1.00	$ 1.00