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Investments Distribution by External Credit Rating for Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 45,291.5 $ 47,443.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5,328.4  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 1,067.2  
Fixed maturity securities in unrealized loss position percent of total 100.00%  
External Credit Rating, Investment Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 42,303.1  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5,273.9  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 650.2  
Fixed maturity securities in unrealized loss position percent of total 60.90%  
External Credit Rating, Below-Investment-Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 2,988.4  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 54.5  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 417.0  
Fixed maturity securities in unrealized loss position percent of total 39.10%