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Loss and Loss Adjustment Expense Reserves Details (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Loss and Loss Adjustment, Expense Reserves [Line Items]    
Net favorable and unfavorable loss reserve development $ (11.2) $ (1.4)
Accretion of fair value adjustment to net loss and LAE reserves 0.2 1.2
Adjustment to loss and loss adjustment expense reserves, before tax 4.5  
Sirius Group
    
Loss and Loss Adjustment, Expense Reserves [Line Items]    
Net favorable and unfavorable loss reserve development (9.8) (4.3)
OneBeacon
    
Loss and Loss Adjustment, Expense Reserves [Line Items]    
Net favorable and unfavorable loss reserve development $ (1.4) $ (2.9)