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Investments - Schedule of Major Industry Types of Fixed Maturity Holdings (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 3,637.5  
Fair Value 3,812.6 $ 3,391.6
Corporate And Other Fixed Maturities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,491.5 2,311.0
Fair Value $ 2,638.9 $ 2,244.5
Percentage of Total 100.00% 100.00%
Corporate And Other Fixed Maturities | Finance, insurance, and real estate    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 550.1 $ 469.0
Fair Value $ 569.3 $ 452.9
Percentage of Total 21.60% 20.20%
Corporate And Other Fixed Maturities | Transportation, communications, electric, gas and sanitary services    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 768.7 $ 758.6
Fair Value $ 808.4 $ 734.0
Percentage of Total 30.60% 32.70%
Corporate And Other Fixed Maturities | Manufacturing    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 731.0 $ 712.7
Fair Value $ 788.2 $ 693.5
Percentage of Total 29.90% 30.90%
Corporate And Other Fixed Maturities | Other    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 441.7 $ 370.7
Fair Value $ 473.0 $ 364.1
Percentage of Total 17.90% 16.20%