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Investment Securities (Investment Holdings Fixed Maturity Table) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fixed maturity investments, at fair value $ 4,175.4 $ 4,250.2    
U.S. Government and agency obligations        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Cost or amortized cost 110.7 281.7    
Trading Securities, Unrealized Holding Gain 0.0 0.1    
Trading Securities, Unrealized Holding Loss (0.4) (3.5)    
Net foreign currency gains (losses) 0.0 0.0    
Fixed maturity investments, at fair value 110.3 278.3    
Debt securities issued by corporations        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Cost or amortized cost 1,680.2 1,512.6    
Trading Securities, Unrealized Holding Gain 10.5 8.4    
Trading Securities, Unrealized Holding Loss (7.6) (13.7)    
Net foreign currency gains (losses) 3.7 2.1    
Fixed maturity investments, at fair value 1,686.8 1,509.4    
Municipal obligations        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Cost or amortized cost 328.9 308.8    
Trading Securities, Unrealized Holding Gain 2.8 1.9    
Trading Securities, Unrealized Holding Loss (1.4) (1.7)    
Net foreign currency gains (losses) 0.0 0.0    
Fixed maturity investments, at fair value 330.3 309.0    
Mortgage-backed and asset-backed securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Cost or amortized cost 2,020.0 2,141.7    
Trading Securities, Unrealized Holding Gain 5.1 2.6    
Trading Securities, Unrealized Holding Loss (8.7) (11.4)    
Net foreign currency gains (losses) 0.0 0.0    
Fixed maturity investments, at fair value 2,016.4 2,132.9    
Foreign government, agency and provincial obligations        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Cost or amortized cost 17.3 12.9    
Trading Securities, Unrealized Holding Gain 0.4 0.3    
Trading Securities, Unrealized Holding Loss 0.0 0.0    
Net foreign currency gains (losses) 0.2 0.0    
Fixed maturity investments, at fair value 17.9 13.2    
Preferred Stock        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Cost or amortized cost 8.3 8.3    
Trading Securities, Unrealized Holding Gain 5.4 5.7    
Trading Securities, Unrealized Holding Loss 0.0 0.0    
Net foreign currency gains (losses) 0.0 0.0    
Fixed maturity investments, at fair value 13.7 14.0    
Fixed Income Investments        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Cost or amortized cost 4,165.4 4,266.0    
Trading Securities, Unrealized Holding Gain 24.2 19.0    
Trading Securities, Unrealized Holding Loss (18.1) (30.3)    
Net foreign currency gains (losses) 3.9 2.1    
Total fixed maturity investments including assets held for sale $ 4,175.4 4,256.8    
Star & Shield Insurance Exchange        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Trading Securities Debt Reclassified to Assets Held-for-sale   $ (6.6) $ (9.4) $ (9.5)