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Investments - Fixed Maturities and Equity Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Available-for-sale securities    
Amortized cost, fixed maturities $ 59,725.8 $ 56,562.1
Gross unrealized gains, fixed maturities 1,612.4 3,093.3
Gross unrealized losses, fixed maturities 1,229.7 267.0
Fair value, fixed maturities 60,108.5 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 53.6 93.3
Net unrealized gains (losses) on impaired fixed maturities, available-for-sale related to changes in fair value subsequent to the impairment date 64.2 103.0
U.S. government and agencies    
Available-for-sale securities    
Amortized cost, fixed maturities 1,441.6 1,314.5
Gross unrealized gains, fixed maturities 16.4 44.9
Gross unrealized losses, fixed maturities 17.0 7.7
Fair value, fixed maturities 1,441.0 1,351.7
Non-U.S. governments    
Available-for-sale securities    
Amortized cost, fixed maturities 833.4 820.5
Gross unrealized gains, fixed maturities 71.7 84.6
Gross unrealized losses, fixed maturities 14.6 3.6
Fair value, fixed maturities 890.5 901.5
States and political subdivisions    
Available-for-sale securities    
Amortized cost, fixed maturities 6,125.0 6,446.1
Gross unrealized gains, fixed maturities 196.0 371.4
Gross unrealized losses, fixed maturities 95.3 15.9
Fair value, fixed maturities 6,225.7 6,801.6
Corporate debt securities    
Available-for-sale securities    
Amortized cost, fixed maturities 35,134.6 34,673.0
Gross unrealized gains, fixed maturities 1,249.9 2,464.2
Gross unrealized losses, fixed maturities 845.2 104.1
Fair value, fixed maturities 35,539.3 37,033.1
Other-than-temporary impairments in AOCI   0.5
Residential mortgage-backed pass-through securities    
Available-for-sale securities    
Amortized cost, fixed maturities 2,488.5 2,493.8
Gross unrealized gains, fixed maturities 21.9 50.8
Gross unrealized losses, fixed maturities 49.8 21.3
Fair value, fixed maturities 2,460.6 2,523.3
Commercial mortgage-backed securities    
Available-for-sale securities    
Amortized cost, fixed maturities 4,023.1 3,734.0
Gross unrealized gains, fixed maturities 17.1 32.7
Gross unrealized losses, fixed maturities 94.6 58.4
Fair value, fixed maturities 3,945.6 3,708.3
Other-than-temporary impairments in AOCI 16.3 50.6
Collateralized debt obligations    
Available-for-sale securities    
Amortized cost, fixed maturities 2,451.3 1,372.1
Gross unrealized gains, fixed maturities   2.7
Gross unrealized losses, fixed maturities 30.5 15.5
Fair value, fixed maturities 2,420.8 1,359.3
Other-than-temporary impairments in AOCI 1.2 0.3
Other debt obligations    
Available-for-sale securities    
Amortized cost, fixed maturities 7,228.3 5,708.1
Gross unrealized gains, fixed maturities 39.4 42.0
Gross unrealized losses, fixed maturities 82.7 40.5
Fair value, fixed maturities 7,185.0 5,709.6
Other-than-temporary impairments in AOCI $ 36.1 $ 41.9