XML 80 R64.htm IDEA: XBRL DOCUMENT v3.8.0.1
Investments - Fixed Maturities and Equity Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fixed maturities    
Available-for-sale securities disclosures    
Amortized cost $ 56,562.1 $ 53,184.2
Gross unrealized gains 3,093.3 2,310.7
Gross unrealized losses 267.0 648.8
Fair value 59,388.4 54,846.1
Other-than-temporary impairments in AOCI 93.3 146.4
Net unrealized gains (losses) on impaired fixed maturities, available-for-sale related to changes in fair value subsequent to the impairment date 103.0 120.9
U.S. government and agencies    
Available-for-sale securities disclosures    
Amortized cost 1,314.5 1,426.7
Gross unrealized gains 44.9 17.2
Gross unrealized losses 7.7 10.9
Fair value 1,351.7 1,433.0
Non-U.S. governments    
Available-for-sale securities disclosures    
Amortized cost 820.5 781.7
Gross unrealized gains 84.6 119.3
Gross unrealized losses 3.6 7.4
Fair value 901.5 893.6
States and political subdivisions    
Available-for-sale securities disclosures    
Amortized cost 6,446.1 5,463.9
Gross unrealized gains 371.4 192.4
Gross unrealized losses 15.9 87.1
Fair value 6,801.6 5,569.2
Other-than-temporary impairments in AOCI   1.1
Corporate debt securities    
Available-for-sale securities disclosures    
Amortized cost 34,673.0 32,699.7
Gross unrealized gains 2,464.2 1,843.5
Gross unrealized losses 104.1 350.8
Fair value 37,033.1 34,192.4
Other-than-temporary impairments in AOCI 0.5 17.2
Residential mortgage-backed pass-through securities    
Available-for-sale securities disclosures    
Amortized cost 2,493.8 2,798.0
Gross unrealized gains 50.8 67.3
Gross unrealized losses 21.3 30.6
Fair value 2,523.3 2,834.7
Commercial mortgage-backed securities    
Available-for-sale securities disclosures    
Amortized cost 3,734.0 4,153.2
Gross unrealized gains 32.7 31.2
Gross unrealized losses 58.4 87.9
Fair value 3,708.3 4,096.5
Other-than-temporary impairments in AOCI 50.6 77.5
Collateralized debt obligations    
Available-for-sale securities disclosures    
Amortized cost 1,372.1 780.1
Gross unrealized gains 2.7 2.8
Gross unrealized losses 15.5 24.3
Fair value 1,359.3 758.6
Other-than-temporary impairments in AOCI 0.3 0.3
Other debt obligations    
Available-for-sale securities disclosures    
Amortized cost 5,708.1 5,080.9
Gross unrealized gains 42.0 37.0
Gross unrealized losses 40.5 49.8
Fair value 5,709.6 5,068.1
Other-than-temporary impairments in AOCI 41.9 50.3
Equity portfolios    
Available-for-sale securities disclosures    
Amortized cost 94.0 104.9
Gross unrealized gains 7.4 4.9
Gross unrealized losses 5.4 10.9
Fair value $ 96.0 $ 98.9