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Reserves for Unpaid Losses and Loss Adjustment Expenses (Reserve Summary) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Loss and Loss Adjustment, Expense Reserves        
Gross beginning balance $ 5,702.3 $ 5,736.8 $ 6,379.2  
Less beginning reinsurance recoverable on unpaid losses (2,507.3) (2,344.0) (2,771.5)  
Net loss and LAE reserves 2,739.8 3,195.0 3,392.8 3,607.7
Loss and LAE reserves sold—OneBeacon Personal Lines 0 0 (231.0)  
Loss and LAE incurred relating to current year losses 1,235.8 1,251.0 1,309.7  
Loss and LAE incurred relating prior year losses (41.9) (76.7) (93.1)  
Total incurred losses and LAE 1,193.9 1,174.3 1,216.6  
Accretion of fair value adjustment to net loss and LAE reserves 10.6 8.3 8.5  
Foreign currency translation adjustment to net loss and LAE reserves 12.9 0.1 4.7  
Loss and LAE paid relating to current year losses (404.7) (387.9) (445.9)  
Loss and LAE paid relating to prior year losses (901.6) (777.3) (646.0)  
Total loss and LAE payments (1,306.3) (1,165.2) (1,091.9)  
Ending Net Loss and LAE Reserves 2,739.8 3,195.0 3,392.8 3,607.7
Plus ending reinsurance recoverable on unpaid losses 429.1 2,507.3 2,344.0  
Gross ending balance 3,168.9 5,702.3 5,736.8  
AutoOne
        
Loss and Loss Adjustment, Expense Reserves        
Net loss and LAE reserves 0 [1] 383.3 [1] 619.6 [1] 759.0 [1]
Ending Net Loss and LAE Reserves 0 [1] 383.3 [1] 619.6 [1] 759.0 [1]
WM Solutions
        
Loss and Loss Adjustment, Expense Reserves        
Loss and LAE reserves acquired $ 17.0 [2] $ 21.0 [2] $ 17.6 [2]  
[1] Loss and LAE reserve balances from OneBeacon’s runoff business prior to December 31, 2012 and AutoOne prior to December 31, 2011 were not classified as held for sale. Adjustment is to present loss and LAE reserve activities for continuing operations.
[2] Loss and LAE reserves acquired relate to WM Solutions purchases of PICO, Citation, American General and American General Property in 2012, Old Lyme in 2011 and Central National in 2010.