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Investment Securities (Cost and Amortized Cost Maturity Schedule) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fixed maturity investments, at fair value $ 4,250.2 $ 2,630.2  
Trading Securities by Maturity Cost or Amortized Cost      
Cost or amortized cost 4,266.0    
Trading Securities by Maturity, Fair Value      
Trading Securities 4,256.8    
Fixed Maturities and Convertible Fixed Maturities Excluding A B S M B S and Preferred Stock      
Trading Securities by Maturity Cost or Amortized Cost      
Due in one year or less 212.8    
Due after one year through five years 1,272.6    
Due after five years through ten years 462.8    
Due after ten years 167.8    
Trading Securities by Maturity, Fair Value      
Due in one year or less 213.3    
Due after one year through five years 1,270.2    
Due after five years through ten years 458.4    
Due after ten years 168.0    
Mortgage and asset-backed securities      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fixed maturity investments, at fair value 2,132.9 1,167.0  
Trading Securities by Maturity Cost or Amortized Cost      
Trading Securities, Maturities without Single Maturity Date, Amortized Cost 2,141.7    
Trading Securities by Maturity, Fair Value      
Trading Securities, Maturities without Single Maturity Date, Carrying Value 2,132.9    
Preferred stocks      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fixed maturity investments, at fair value 14.0 82.7  
Trading Securities by Maturity Cost or Amortized Cost      
Trading Securities, Maturities without Single Maturity Date, Amortized Cost 8.3    
Trading Securities by Maturity, Fair Value      
Trading Securities, Maturities without Single Maturity Date, Carrying Value 14.0    
Fixed maturity investments | Star & Shield Insurance Exchange [Member]      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fixed maturity investments, at fair value $ 6.6 $ 9.5 $ 10.1