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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss) attributable to White Mountains’s common shareholders	$ (128.8)	$ 284.4
Other comprehensive loss, net of tax	(3.4)	(0.3)
Comprehensive (loss) income	(132.2)	284.1
Comprehensive loss attributable to non-controlling interests	0.0	0.0
Comprehensive (loss) income attributable to White Mountains’s common shareholders	$ (132.2)	$ 284.1
Basic (loss) earnings per share
Continuing operations (in usd per share)	$ (40.82)	$ 89.42
Discontinued operations (in usd per share)	0.28	0.22
Total consolidated operations (in usd per share)	(40.54)	89.64
Diluted (loss) earnings per share
Continuing operations (in usd per share)	(40.82)	89.42
Discontinued operations (in usd per share)	0.28	0.22
Total consolidated operations (in usd per share)	(40.54)	89.64
Dividends declared per White Mountains’s common share	$ 1.00	$ 1.00

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