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Investments Distribution by External Credit Rating for Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities    
Fixed Maturity Securities $ 44,782.6 $ 43,011.7
Accumulated Gross Unrealized Gain on Securities 4,580.2  
Accumulated Gross Unrealized Loss on Securities $ 271.8  
Percent of Fixed Maturity Securities in Unrealized Loss Position 100.00%  
External Credit Rating, Investment Grade    
Schedule of Available-for-sale Securities    
Fixed Maturity Securities $ 41,548.7  
Accumulated Gross Unrealized Gain on Securities 4,497.1  
Accumulated Gross Unrealized Loss on Securities $ 175.3  
Percent of Fixed Maturity Securities in Unrealized Loss Position 64.50%  
External Credit Rating, Non Investment Grade    
Schedule of Available-for-sale Securities    
Fixed Maturity Securities $ 3,233.9  
Accumulated Gross Unrealized Gain on Securities 83.1  
Accumulated Gross Unrealized Loss on Securities $ 96.5  
Percent of Fixed Maturity Securities in Unrealized Loss Position 35.50%