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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income (loss) attributable to White Mountains’s common shareholders $ 19.6 $ (169.2) $ 199.1 $ (135.8)
Other comprehensive income, net of tax:        
Other comprehensive income (loss), net of tax 1.4 (1.1) 2.6 (1.5)
Other comprehensive income (loss) from discontinued operations, net of tax - NSM Group 0.0 (4.0) 0.0 (5.9)
Comprehensive income (loss) 21.0 (174.3) 201.7 (143.2)
Other comprehensive (income) loss attributable to noncontrolling interests (0.4) 0.5 (0.8) 0.7
Comprehensive income (loss) attributable to White Mountains’s common shareholders $ 20.6 $ (173.8) $ 200.9 $ (142.5)
Basic earnings (loss) per share        
Basic and diluted earnings (losses) per share (in dollars per share) $ 7.65 $ (58.78) $ 77.57 $ (48.57)
Discontinued operations (in usd per share) 0 1.98 0 3.17
Total consolidated operations (in usd per share) 7.65 (56.80) 77.57 (45.40)
Diluted earnings (loss) per share        
Continuing operations (in usd per share) 7.65 (58.78) 77.57 (48.57)
Discontinued operations (in usd per share) 0 1.98 0 3.17
Total consolidated operations (in usd per share) 7.65 (56.80) 77.57 (45.40)
Dividends declared and paid per White Mountains’s common share $ 0 $ 0 $ 1.00 $ 1.00