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Segment Information - Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2012
Segment reporting information      
Total investments $ 2,939.1 $ 2,947.2  
Total assets 4,831.4 3,983.2  
Total liabilities 1,013.5 838.5  
Total White Mountains’s common shareholders’ equity 3,906.0 3,261.5  
Non-controlling interests (88.1) (116.8)  
Held for Sale      
Segment reporting information      
Total investments 0.0 0.0  
Total assets 2.3 3.0  
Total liabilities 0.0 0.0  
Total White Mountains’s common shareholders’ equity 2.3 3.0  
Non-controlling interests 0.0 0.0  
HG Global-BAM      
Segment reporting information      
Total investments 919.9 845.6  
Total assets 1,017.8 924.0  
Total liabilities 291.5 246.8  
Total White Mountains’s common shareholders’ equity 836.1 809.5  
Non-controlling interests (109.8) (132.3)  
NSM      
Segment reporting information      
Total investments 0.0 0.0  
Total assets 999.6 825.2  
Total liabilities 491.8 401.1  
Total White Mountains’s common shareholders’ equity 490.7 409.3  
Non-controlling interests 17.1 14.8  
Kudu      
Segment reporting information      
Total investments 400.7 266.6  
Total assets 430.2 290.5  
Total liabilities 96.3 57.0  
Total White Mountains’s common shareholders’ equity 331.6 231.3  
Non-controlling interests 2.3 2.2  
Other Operations      
Segment reporting information      
Total investments 1,618.5 1,835.0  
Total assets 2,381.5 1,940.5  
Total liabilities 133.9 133.6  
Total White Mountains’s common shareholders’ equity 2,245.3 1,808.4  
Non-controlling interests 2.3 (1.5)  
BAM      
Segment reporting information      
Surplus notes 388.2 457.6  
Accrued interest on surplus notes 155.7 162.7  
HG Global      
Segment reporting information      
Non-controlling interests 13.5 14.4  
Surplus notes     $ 503.0
Preferred Dividends Payable | HG Global      
Segment reporting information      
Total liabilities $ 363.9 $ 330.3