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Reserves for Unpaid Losses and Loss Adjustment Expenses (Reserve Summary) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
AutoOne
Dec. 31, 2012
AutoOne
Dec. 31, 2011
AutoOne
Dec. 31, 2010
AutoOne
Dec. 31, 2013
WM Solutions
Dec. 31, 2012
WM Solutions
Dec. 31, 2011
WM Solutions
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]                    
Gross beginning balance $ 3,168.9 $ 5,702.3 $ 5,736.8              
Less beginning reinsurance recoverable on unpaid losses (429.1) (2,507.3) (2,344.0)              
Net loss and LAE reserves 2,739.8 3,195.0 3,392.8 0 [1] 0 [1] (383.3) [1] (619.6) [1]      
Loss and LAE reserves acquired               37.7 [2] 17.0 [2] 21.0 [2]
Loss and LAE incurred relating to current year losses 1,088.9 1,235.8 1,251.0              
Loss and LAE incurred relating prior year losses (48.4) (41.9) (76.7)              
Total incurred losses and LAE 1,040.5 1,193.9 1,174.3              
Accretion of fair value adjustment to net loss and LAE reserves 1.7 10.6 8.3              
Foreign currency translation adjustment to net loss and LAE reserves 0.3 12.9 0.1              
Loss and LAE paid relating to current year losses (336.2) (404.7) (387.9)              
Loss and LAE paid relating to prior year losses (832.6) (901.6) (777.3)              
Total loss and LAE payments (1,168.8) (1,306.3) (1,165.2)              
Net loss and LAE reserves 2,651.2 2,739.8 3,195.0 0 [1] 0 [1] (383.3) [1] (619.6) [1]      
Plus ending reinsurance recoverable on unpaid losses 428.1 429.1 2,507.3              
Gross ending balance $ 3,079.3 $ 3,168.9 $ 5,702.3              
[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 Empire and Ashmere in 2013, PICO, Citation, Woodridge and Oakwood in 2012 and Old Lyme in 2011.