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Investments Distribution by External Credit Rating for Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 48,233.4 $ 47,443.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 7,654.2  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 231.4  
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 $ 44,793.4  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 7,531.3  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 68.1  
Fixed maturity securities in unrealized loss position percent of total 29.40%  
External Credit Rating, Below-Investment-Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 3,440.0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 122.9  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 163.3  
Fixed maturity securities in unrealized loss position percent of total 70.60%