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Investments - Fixed Maturities and Equity Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Available-for-sale securities    
Amortized cost, fixed maturities $ 59,937.6 $ 56,562.1
Gross unrealized gains, fixed maturities 1,649.2 3,093.3
Gross unrealized losses, fixed maturities 1,139.6 267.0
Fair value, fixed maturities 60,447.2 59,388.4
Amortized cost, equity securities   94.0
Gross unrealized gains, equity securities   7.4
Gross unrealized losses, equity securities   5.4
Fair value, equity securities   96.0
Other-than-temporary impairments in AOCI 79.1 93.3
Net unrealized gains (losses) on impaired fixed maturities, available-for-sale related to changes in fair value subsequent to the impairment date 86.2 103.0
U.S. government and agencies    
Available-for-sale securities    
Amortized cost, fixed maturities 1,342.4 1,314.5
Gross unrealized gains, fixed maturities 5.8 44.9
Gross unrealized losses, fixed maturities 38.0 7.7
Fair value, fixed maturities 1,310.2 1,351.7
Non-U.S. governments    
Available-for-sale securities    
Amortized cost, fixed maturities 1,111.1 820.5
Gross unrealized gains, fixed maturities 73.5 84.6
Gross unrealized losses, fixed maturities 12.3 3.6
Fair value, fixed maturities 1,172.3 901.5
States and political subdivisions    
Available-for-sale securities    
Amortized cost, fixed maturities 6,414.7 6,446.1
Gross unrealized gains, fixed maturities 160.9 371.4
Gross unrealized losses, fixed maturities 127.4 15.9
Fair value, fixed maturities 6,448.2 6,801.6
Corporate debt securities    
Available-for-sale securities    
Amortized cost, fixed maturities 35,484.0 34,673.0
Gross unrealized gains, fixed maturities 1,353.4 2,464.2
Gross unrealized losses, fixed maturities 633.3 104.1
Fair value, fixed maturities 36,204.1 37,033.1
Other-than-temporary impairments in AOCI 0.4 0.5
Residential mortgage-backed pass-through securities    
Available-for-sale securities    
Amortized cost, fixed maturities 2,421.7 2,493.8
Gross unrealized gains, fixed maturities 19.9 50.8
Gross unrealized losses, fixed maturities 78.5 21.3
Fair value, fixed maturities 2,363.1 2,523.3
Commercial mortgage-backed securities    
Available-for-sale securities    
Amortized cost, fixed maturities 3,950.5 3,734.0
Gross unrealized gains, fixed maturities 12.4 32.7
Gross unrealized losses, fixed maturities 112.7 58.4
Fair value, fixed maturities 3,850.2 3,708.3
Other-than-temporary impairments in AOCI 39.8 50.6
Collateralized debt obligations    
Available-for-sale securities    
Amortized cost, fixed maturities 2,376.6 1,372.1
Gross unrealized gains, fixed maturities 0.2 2.7
Gross unrealized losses, fixed maturities 8.2 15.5
Fair value, fixed maturities 2,368.6 1,359.3
Other-than-temporary impairments in AOCI 1.0 0.3
Other debt obligations    
Available-for-sale securities    
Amortized cost, fixed maturities 6,836.6 5,708.1
Gross unrealized gains, fixed maturities 23.1 42.0
Gross unrealized losses, fixed maturities 129.2 40.5
Fair value, fixed maturities 6,730.5 5,709.6
Other-than-temporary impairments in AOCI $ 37.9 $ 41.9