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Discontinued Operations Discontinued Operations (Interest Rate Cap) (Details)
$ in Millions
1 Months Ended 12 Months Ended
May. 31, 2007
shares
Dec. 31, 2015
USD ($)
Rating
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sirius Group | Interest Rate Cap        
Derivative [Line Items]        
basis points   3.95%    
Derivative, Fair Value, Net   $ 1.9 $ 4.1 $ 11.1
Derivative Collateral Right to Reclaim   $ 1.9    
S&P Credit Ratings | Rating   21    
Change in fair value of derivatives, included in other revenue   $ 2.2 $ 7.0  
years of interest rate cap   5 years    
Derivative, Cap Interest Rate   8.30%    
Derivative, Cost of Hedge   $ 9.9    
Barclays [Member] | Standard & Poor's, A Rating [Member] | Sirius Group | Interest Rate Cap        
Derivative [Line Items]        
Derivative Collateral Right to Reclaim   1.3    
Nordea Bank Finland [Member] | Standard & Poor's, AA- Rating [Member] | Sirius Group | Interest Rate Cap        
Derivative [Line Items]        
Derivative Collateral Right to Reclaim   $ 0.6    
Preferred stocks | Sirius Internation Group Ltd        
Derivative [Line Items]        
Preference shares floating rate of dividend amount in excess of libor 3.20%      
Preferred stocks | Sirius Group | Interest Rate Cap        
Derivative [Line Items]        
Preferred stock dividend rate 7.506%      
Preference shares reference rate for dividend 3      
Sale of Stock, Number of Shares Issued in Transaction | shares 250,000,000.0