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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net income (loss) attributable to White Mountains’s common shareholders $ 414.5 $ (141.2) $ 627.2
Other comprehensive income, net of tax:      
Other comprehensive (loss) income, net of tax (1.4) (4.8) 0.3
Comprehensive income from discontinued operations, net of tax 0.0 0.0 3.2
Comprehensive income (loss) 413.1 (146.0) 630.7
Comprehensive loss (income) attributable to non-controlling interests 0.0 0.3 (0.2)
Comprehensive income (loss) attributable to White Mountains’s common shareholders $ 413.1 $ (145.7) $ 630.5
Basic earnings (loss) per share      
Continuing operations $ 130.02 $ (36.67) $ 11.56
Discontinued operations 0.25 (5.09) 134.50
Total consolidated operations 130.27 (41.76) 146.06
Diluted earnings (loss) per share      
Continuing operations 130.02 (36.67) 11.56
Discontinued operations 0.25 (5.09) 134.50
Total consolidated operations 130.27 (41.76) 146.06
Dividends declared and paid per White Mountains’s common share $ 1.00 $ 1.00 $ 1.00