XML 55 R43.htm IDEA: XBRL DOCUMENT v3.10.0.1
Investments Distribution by External Credit Rating for Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 43,071.3 $ 45,457.8
Accumulated Gross Unrealized Gain on Securities 3,654.7  
Accumulated Gross Unrealized Loss on Securities $ 496.6  
Percent of Fixed Maturity Securities in Unrealized Loss Position 100.00%  
External Credit Rating, Investment Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 39,839.9  
Accumulated Gross Unrealized Gain on Securities 3,577.7  
Accumulated Gross Unrealized Loss on Securities $ 411.2  
Percent of Fixed Maturity Securities in Unrealized Loss Position 82.80%  
External Credit Rating, Below-Investment-Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 3,231.4  
Accumulated Gross Unrealized Gain on Securities 77.0  
Accumulated Gross Unrealized Loss on Securities $ 85.4  
Percent of Fixed Maturity Securities in Unrealized Loss Position 17.20%