CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues
Earned insurance premiums	$ 1,188.2	$ 1,185.0	$ 1,120.9
Net investment income	60.8	59.5	59.8
Net realized and unrealized investment gains	225.4	78.5	133.9
Other revenue	334.2	131.1	47.0
Total revenues	1,808.6	1,454.1	1,361.6
Expenses
Loss and loss adjustment expenses	708.9	824.0	622.1
Insurance and reinsurance acquisition expenses	220.1	206.2	210.4
Other underwriting expenses	218.6	179.6	205.2
General and administrative expenses	487.5	257.7	149.1
Interest expense on debt	18.6	15.6	16.2
Total expenses	1,653.7	1,483.1	1,203.0
Pre-tax income (loss)	154.9	(29.0)	158.6
Income tax (expense) benefit	0.7	14.8	(32.6)
Net income (loss) from continuing operations	155.6	(14.2)	126.0
Gain (loss) on sale of discontinued operations, net of tax	18.2	(1.6)	46.6
Net income from discontinued operations, net of tax	80.6	260.2	99.9
Income before equity in earnings of unconsolidated affiliates	254.4	244.4	272.5
Equity in earnings of unconsolidated affiliates, net of tax	25.1	45.6	36.6
Net income	279.5	290.0	309.1
Net loss attributable to non-controlling interests	18.1	22.2	12.5
Net income attributable to White Mountains’s common shareholders	297.6	312.2	321.6
Other comprehensive income, net of tax:
Change in equity in net unrealized (losses) gains from investments in Symetra common shares, net of tax	(34.9)	75.3	(98.1)
Change in foreign currency translation, net of tax	(65.8)	(168.5)	2.7
Net change in pension liability and other, net of tax	0.3	(11.7)	20.8
Comprehensive income	197.2	207.3	247.0
Comprehensive loss (income) attributable to non-controlling interests	0.0	3.3	(5.2)
Comprehensive income attributable to White Mountains’s common shareholders	$ 197.2	$ 210.6	$ 241.8
Basic earnings per share
Continuing operations	$ 33.80	$ 8.77	$ 28.22
Discontinued operations	16.80	42.36	23.63
Total consolidated operations	50.60	51.13	51.85
Diluted earnings per share
Continuing operations	33.80	8.77	28.22
Discontinued operations	16.80	42.36	23.63
Total consolidated operations	50.60	51.13	51.85
Dividends declared and paid per White Mountains’s common share	$ 1.00	$ 1.00	$ 1.00