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Loss and Loss Adjustment Expense Reserves (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2011
AutoOne
Dec. 31, 2010
AutoOne
Mar. 31, 2012
Scandinavian Re
Mar. 31, 2012
One Beacon
Mar. 31, 2011
One Beacon
Mar. 31, 2012
Sirius group
Mar. 31, 2011
Sirius group
Dec. 31, 2011
Sirius group
Loss and Loss Adjustment Expense Reserve                    
Gross beginning balance $ 5,702.3 $ 5,736.8                
Less beginning reinsurance recoverable on unpaid losses (2,507.3) (2,344.0)                
Net loss and LAE reserves 3,195.0 3,392.8 72.7 (77.3)            
Loss and LAE incurred relating to current year losses 257.9 375.7                
Net favorable and unfavorable loss reserve development 4.8 (17.3)       10.5 (5.1) (5.7) (12.2) (8.1)
Total incurred losses and LAE 262.7 358.4           113.4 228.0  
Accretion of fair value adjustment to net loss and LAE reserves 7.1 2.1     5.0          
Foreign currency translation adjustment to net loss and LAE reserves 11.8 21.1                
Loss and LAE paid relating to current year losses (46.7) (44.5)                
Loss and LAE paid relating to prior year losses (384.5) (269.7)                
Total loss and LAE payments (431.2) (314.2)                
Net ending balance 3,045.4 3,455.6 72.7 (77.3)            
Plus ending reinsurance recoverable on unpaid losses (2,465.4) (2,304.1)           (356.4)    
Gross ending balance 5,510.8 5,759.7                
Case incurred loss and ALAE during the period 262.7 358.4           113.4 228.0  
Net favorable loss reserve development due to 2010 Chilean earthquake                 5.0  
Net favorable loss reserve development due to 1999 aviation loss                 9.0  
Increase (decrease) in reserves         5.0          
Accretion of fair value adjustment to net loss and LAE reserves increase         5.0          
Remaining unamortized fair value adjustment         $ 4.0