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Investments in Unconsolidated Affiliates (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Investments in unconsolidated affiliates        
Total investments in unconsolidated affiliates $ 383.6 $ 387.9    
Symetra
        
Investments in unconsolidated affiliates        
Equity in Unrealized Gains (Losses) from Investments in Unconsolidated Affiliates 54.1 62.8    
Total investments in unconsolidated affiliates 377.5 [1],[2] 381.5 293.2 [1],[2] 273.6
Symetra | Common shareholders' equity.
        
Investments in unconsolidated affiliates        
Symetra Common Shares excluding unrealized gains (losses) 296.8 288.4    
Total investments in unconsolidated affiliates 350.9 [1],[2] 351.2 269.5 [1],[2] 261.0
Symetra | Warrants
        
Investments in unconsolidated affiliates        
Total investments in unconsolidated affiliates 26.6 [1],[2] 30.3 23.7 [1],[2] 12.6
Hamer, LLC
        
Investments in unconsolidated affiliates        
Total investments in unconsolidated affiliates 3.8 4.0    
Bri-Mar Manufacturing, LLC
        
Investments in unconsolidated affiliates        
Total investments in unconsolidated affiliates 1.8 1.9    
Pentelia Capital Management
        
Investments in unconsolidated affiliates        
Total investments in unconsolidated affiliates $ 0.5 $ 0.5    
[1] Includes White Mountains’ equity in net unrealized gains from Symetra’s fixed maturity portfolio of $(8.7) and $(1.2) as of March 31, 2013 and 2012, which exclude tax benefit of $0.7 and $0.0.
[2] The aggregate value of White Mountains’ investment in common shares of Symetra was $233.3 based upon the quoted market price of $13.41 per share at March 31, 2013.