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Investments Distribution by External Credit Rating for Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 43,360.9 $ 45,457.8
Accumulated Gross Unrealized Gain on Securities 3,998.8  
Accumulated Gross Unrealized Loss on Securities $ 455.1  
Percent of Fixed Maturity Securities in Unrealized Loss Position 100.00%  
External Credit Rating, Investment Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 40,157.1  
Accumulated Gross Unrealized Gain on Securities 3,911.0  
Accumulated Gross Unrealized Loss on Securities $ 352.6  
Percent of Fixed Maturity Securities in Unrealized Loss Position 77.50%  
External Credit Rating, Below-Investment-Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 3,203.8  
Accumulated Gross Unrealized Gain on Securities 87.8  
Accumulated Gross Unrealized Loss on Securities $ 102.5  
Percent of Fixed Maturity Securities in Unrealized Loss Position 22.50%