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Investments - Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Cost or Amortized Cost    
Due in one year or less, cost or amortized cost $ 463.5  
Due after one year through five years, cost or amortized cost 2,547.5  
Due after five years through ten years, cost or amortized cost 2,439.3  
Due after ten years, cost or amortized cost 3,987.2  
Total, cost or amortized cost 9,437.5  
Fixed maturity securities, cost or amortized cost 11,379.3 $ 11,064.8
Fair Value    
Due in one year or less, fair value 470.4  
Due after one year through five years, fair value 2,717.6  
Due after five years through ten years, fair value 2,744.2  
Due after ten years, fair value 5,109.4  
Total, fair value 11,041.6  
Fixed maturity securities, fair value 13,094.5 $ 12,322.4
Commercial mortgage-backed    
Cost or Amortized Cost    
Cost or amortized cost 327.2  
Fair Value    
Fair value 340.2  
Residential mortgage-backed    
Cost or Amortized Cost    
Cost or amortized cost 1,084.7  
Fair Value    
Fair value 1,180.3  
Asset-backed    
Cost or Amortized Cost    
Cost or amortized cost 529.9  
Fair Value    
Fair value $ 532.4