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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]    
Net loss attributable to White Mountains’s common shareholders $ (75.3) $ (128.8)
Other comprehensive income (loss), net of tax 1.8 (3.4)
Comprehensive loss (73.5) (132.2)
Other comprehensive income attributable to non-controlling interests (0.1) 0.0
Comprehensive loss attributable to White Mountains’s common shareholders $ (73.6) $ (132.2)
Basic (loss) earnings per share    
Continuing operations (in usd per share) $ (30.33) $ (40.82)
Discontinued operations (in usd per share) 6.03 0.28
Total consolidated operations (in usd per share) (24.30) (40.54)
Diluted (loss) earnings per share    
Continuing operations (in usd per share) (30.33) (40.82)
Discontinued operations (in usd per share) 6.03 0.28
Total consolidated operations (in usd per share) (24.30) (40.54)
Dividends declared per White Mountains’s common share (in USD per share) $ 1.00 $ 1.00