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Discontinued Operations (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Basic and diluted earnings (loss) per share numerators (in millions):    
Net income attributable to White Mountains' common shareholders $ 0.1 $ 2.5
Net income attributable to White Mountains' common shareholders, net of restricted common share amounts 93.8 (28.2)
Basic earnings per share denominators (in thousands):    
Total average common shares outstanding during the period 7,431,700 8,031,800
Average unvested restricted common shares (78,300) (57,100)
Basic earnings (loss) per share denominator 7,353,400 7,974,700
Diluted earnings per share denominator (in thousands):    
Total average common shares outstanding during the period 7,431,700 8,031,800
Average unvested restricted common shares (78,300) (57,100)
Diluted earnings (loss) per share denominator 7,353,400 7,974,700
Discontinued Operations.
    
Basic and diluted earnings (loss) per share numerators (in millions):    
Net income attributable to White Mountains' common shareholders 0.1 2.5
Net income attributable to White Mountains' common shareholders, net of restricted common share amounts $ 0.1 $ 2.5
Basic earnings per share denominators (in thousands):    
Total average common shares outstanding during the period 7,431,700 8,031,800
Average unvested restricted common shares (78,300) (57,100)
Basic earnings (loss) per share denominator 7,353,400 7,974,700
Diluted earnings per share denominator (in thousands):    
Total average common shares outstanding during the period 7,431,700 8,031,800
Average unvested restricted common shares (78,300) (57,100)
Diluted earnings (loss) per share denominator 7,353,400 7,974,700
Basic and diluted earnings (loss) per share (in dollars per share): $ 0.02 $ 0.31