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Investments in Unconsolidated Affiliates (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Investments in unconsolidated affiliates            
Total investments in unconsolidated affiliates $ 337.5   $ 275.3      
Symetra
            
Investments in unconsolidated affiliates            
Total investments in unconsolidated affiliates 335.7 [1],[2] 293.2 273.6 421.0 [1],[2] 392.8 387.5
Symetra | Common shareholders' equity.
            
Investments in unconsolidated affiliates            
Total investments in unconsolidated affiliates 305.9 [1],[2] 269.5 261.0 388.5 [1],[2] 356.9 350.4
Symetra | Warrants
            
Investments in unconsolidated affiliates            
Total investments in unconsolidated affiliates 29.8 [1],[2] 23.7 12.6 32.5 [1],[2] 35.9 37.1
Pentelia Capital Management
            
Investments in unconsolidated affiliates            
Total investments in unconsolidated affiliates $ 1.8   $ 1.7      
[1] The aggregate value of White Mountains’ investment in common shares of Symetra was $219.6 based upon the quoted market price of $12.62 per share at June 30, 2012.
[2] Includes White Mountains’ equity in net unrealized gains from Symetra’s fixed maturity portfolio of $29.4 and $87.7 as of June 30, 2012 and 2011, which exclude tax expense of $2.4 and $7.1.