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Investment Securities (Investment Holdings Fixed Maturity Table) (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Fixed maturity investments, at fair value $ 4,362.8 $ 2,630.2    
U.S. Government and agency obligations        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Cost or amortized cost 261.2 160.4    
Trading Securities, Unrealized Holding Gain 0.7 0.0    
Trading Securities, Unrealized Holding Loss 0.0 (0.4)    
Net foreign currency gains (losses) 0.0 0.0    
Fixed maturity investments, at fair value 261.9 160.0    
Debt securities issued by corporations        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Cost or amortized cost 1,046.9 1,001.0    
Trading Securities, Unrealized Holding Gain 19.3 4.3    
Trading Securities, Unrealized Holding Loss (0.1) (5.3)    
Net foreign currency gains (losses) 0.0 0.0    
Fixed maturity investments, at fair value 1,066.1 1,000.0    
Municipal obligations        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Cost or amortized cost 294.8 227.8    
Trading Securities, Unrealized Holding Gain 8.2 2.2    
Trading Securities, Unrealized Holding Loss (0.1) (1.2)    
Net foreign currency gains (losses) 0.0 0.0    
Fixed maturity investments, at fair value 302.9 228.8    
Mortgage-backed and asset-backed securities        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Cost or amortized cost 2,646.8 1,170.6    
Trading Securities, Unrealized Holding Gain 10.4 2.0    
Trading Securities, Unrealized Holding Loss (2.0) (5.6)    
Net foreign currency gains (losses) 0.0 0.0    
Fixed maturity investments, at fair value 2,655.2 1,167.0    
Foreign government, agency and provincial obligations        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Cost or amortized cost 1.0 1.0    
Trading Securities, Unrealized Holding Gain 0.2 0.2    
Trading Securities, Unrealized Holding Loss 0.0 0.0    
Net foreign currency gains (losses) 0.0 0.0    
Fixed maturity investments, at fair value 1.2 1.2    
Preferred Stock        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Cost or amortized cost 78.3 78.3    
Trading Securities, Unrealized Holding Gain 6.4 4.4    
Trading Securities, Unrealized Holding Loss 0.0 0.0    
Net foreign currency gains (losses) 0.0 0.0    
Fixed maturity investments, at fair value 84.7 82.7    
Fixed Income Investments        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Cost or amortized cost 4,329.0 2,639.1    
Trading Securities, Unrealized Holding Gain 45.2 13.1    
Trading Securities, Unrealized Holding Loss (2.2) (12.5)    
Net foreign currency gains (losses) 0.0 0.0    
Total fixed maturity investments including assets held for sale 4,372.0 2,639.7    
Star & Shield Insurance Exchange        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Trading Securities Debt Reclassified to Assets Held-for-sale $ 9.2 $ 9.5 $ 9.1 $ 10.1