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Reserves for Unpaid Losses and Loss Adjustment Expenses (LAE Reserve Activity) (Details) (Sirius Group, USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Gross      
Beginning balance $ 228.6 $ 207.2 $ 214.3
Losses and LAE acquired 14.0 11.7 0
Incurred losses and LAE 12.9 46.7 16.5
Paid losses and LAE (27.7) (37.0) (23.6)
Ending balance 227.8 228.6 207.2
Net      
Beginning balance 189.4 162.7 169.6
Losses and LAE acquired Central National 14.0 11.7 0
Incurred losses and LAE 12.6 45.9 12.3
Liability for unpaid claims and claims adjustment expense (22.1) (30.9) (19.2)
Ending balance 193.9 189.4 162.7
Asbestos
      
Gross      
Beginning balance 208.2 185.1 191.9
Losses and LAE acquired 13.0 11.0 0
Incurred losses and LAE 12.1 46.8 13.6
Paid losses and LAE (25.9) (34.7) (20.4)
Ending balance 207.4 208.2 185.1
Net      
Beginning balance 174.2 146.2 151.5
Losses and LAE acquired Central National 13.0 11.0 0
Incurred losses and LAE 11.8 46.4 10.3
Liability for unpaid claims and claims adjustment expense (20.3) (29.4) (15.6)
Ending balance 178.7 174.2 146.2
Environmental
      
Gross      
Beginning balance 20.4 22.1 22.4
Losses and LAE acquired 1.0 0.7 0
Incurred losses and LAE 0.8 (0.1) 2.9
Paid losses and LAE (1.8) (2.3) (3.2)
Ending balance 20.4 20.4 22.1
Net      
Beginning balance 15.2 16.5 18.1
Losses and LAE acquired Central National 1.0 0.7 0
Incurred losses and LAE 0.8 (0.5) 2.0
Liability for unpaid claims and claims adjustment expense (1.8) (1.5) (3.6)
Ending balance $ 15.2 $ 15.2 $ 16.5