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Investments - Fixed Maturities and Equity Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Available-for-sale securities    
Amortized cost, fixed maturities $ 65,302.5 $ 59,725.8
Gross unrealized gains, fixed maturities 4,927.7 1,612.4
Gross unrealized losses, fixed maturities 124.0 1,229.7
Fair value, fixed maturities 70,106.2 60,108.5
Other-than-temporary impairments in AOCI 48.4 53.6
Net unrealized gains (losses) on impaired fixed maturities, available-for-sale related to changes in fair value subsequent to the impairment date 62.3 64.2
U.S. government and agencies    
Available-for-sale securities    
Amortized cost, fixed maturities 1,627.0 1,441.6
Gross unrealized gains, fixed maturities 100.2 16.4
Gross unrealized losses, fixed maturities 3.0 17.0
Fair value, fixed maturities 1,724.2 1,441.0
Non-U.S. governments    
Available-for-sale securities    
Amortized cost, fixed maturities 852.3 833.4
Gross unrealized gains, fixed maturities 144.1 71.7
Gross unrealized losses, fixed maturities 0.2 14.6
Fair value, fixed maturities 996.2 890.5
States and political subdivisions    
Available-for-sale securities    
Amortized cost, fixed maturities 6,857.1 6,125.0
Gross unrealized gains, fixed maturities 644.5 196.0
Gross unrealized losses, fixed maturities 11.6 95.3
Fair value, fixed maturities 7,490.0 6,225.7
Corporate debt securities    
Available-for-sale securities    
Amortized cost, fixed maturities 36,993.1 35,134.6
Gross unrealized gains, fixed maturities 3,706.5 1,249.9
Gross unrealized losses, fixed maturities 52.2 845.2
Fair value, fixed maturities 40,647.4 35,539.3
Residential mortgage-backed pass-through securities    
Available-for-sale securities    
Amortized cost, fixed maturities 2,913.9 2,488.5
Gross unrealized gains, fixed maturities 72.3 21.9
Gross unrealized losses, fixed maturities 3.8 49.8
Fair value, fixed maturities 2,982.4 2,460.6
Commercial mortgage-backed securities    
Available-for-sale securities    
Amortized cost, fixed maturities 4,746.6 4,023.1
Gross unrealized gains, fixed maturities 127.6 17.1
Gross unrealized losses, fixed maturities 24.0 94.6
Fair value, fixed maturities 4,850.2 3,945.6
Other-than-temporary impairments in AOCI 15.8 16.3
Collateralized debt obligations    
Available-for-sale securities    
Amortized cost, fixed maturities 3,226.7 2,451.3
Gross unrealized gains, fixed maturities 2.9  
Gross unrealized losses, fixed maturities 14.3 30.5
Fair value, fixed maturities 3,215.3 2,420.8
Other-than-temporary impairments in AOCI 0.9 1.2
Other debt obligations    
Available-for-sale securities    
Amortized cost, fixed maturities 8,085.8 7,228.3
Gross unrealized gains, fixed maturities 129.6 39.4
Gross unrealized losses, fixed maturities 14.9 82.7
Fair value, fixed maturities 8,200.5 7,185.0
Other-than-temporary impairments in AOCI $ 31.7 $ 36.1