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Investments - Fixed Maturities and Equity Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Available-for-sale securities    
Amortized cost, fixed maturities $ 66,648.7 $ 65,302.5
Gross unrealized gains, fixed maturities 3,880.0 4,927.7
Gross unrealized losses, fixed maturities 1,813.3 124.0
Allowance, fixed maturities 7.6  
Fair value, fixed maturities 68,707.8 70,106.2
Other-than-temporary impairments in AOCI   48.4
Accrued interest receivable 569.8  
Net unrealized gains (losses) on impaired fixed maturities, available-for-sale related to changes in fair value subsequent to the impairment date   62.3
U.S. government and agencies    
Available-for-sale securities    
Amortized cost, fixed maturities 1,463.6 1,627.0
Gross unrealized gains, fixed maturities 267.6 100.2
Gross unrealized losses, fixed maturities   3.0
Fair value, fixed maturities 1,731.2 1,724.2
Non-U.S. governments    
Available-for-sale securities    
Amortized cost, fixed maturities 837.4 852.3
Gross unrealized gains, fixed maturities 120.9 144.1
Gross unrealized losses, fixed maturities 1.6 0.2
Fair value, fixed maturities 956.7 996.2
States and political subdivisions    
Available-for-sale securities    
Amortized cost, fixed maturities 7,077.8 6,857.1
Gross unrealized gains, fixed maturities 709.6 644.5
Gross unrealized losses, fixed maturities 24.0 11.6
Fair value, fixed maturities 7,763.4 7,490.0
Corporate debt securities    
Available-for-sale securities    
Amortized cost, fixed maturities 38,044.9 36,993.1
Gross unrealized gains, fixed maturities 2,446.8 3,706.5
Gross unrealized losses, fixed maturities 1,063.5 52.2
Allowance, fixed maturities 7.0  
Fair value, fixed maturities 39,421.2 40,647.4
Residential mortgage-backed pass-through securities    
Available-for-sale securities    
Amortized cost, fixed maturities 3,063.8 2,913.9
Gross unrealized gains, fixed maturities 138.4 72.3
Gross unrealized losses, fixed maturities 0.3 3.8
Fair value, fixed maturities 3,201.9 2,982.4
Commercial mortgage-backed securities    
Available-for-sale securities    
Amortized cost, fixed maturities 4,793.6 4,746.6
Gross unrealized gains, fixed maturities 20.7 127.6
Gross unrealized losses, fixed maturities 320.2 24.0
Allowance, fixed maturities 0.4  
Fair value, fixed maturities 4,493.7 4,850.2
Other-than-temporary impairments in AOCI   15.8
Collateralized debt obligations    
Available-for-sale securities    
Amortized cost, fixed maturities 3,555.6 3,226.7
Gross unrealized gains, fixed maturities 3.9 2.9
Gross unrealized losses, fixed maturities 211.1 14.3
Allowance, fixed maturities 0.1  
Fair value, fixed maturities 3,348.3 3,215.3
Other-than-temporary impairments in AOCI   0.9
Other debt obligations    
Available-for-sale securities    
Amortized cost, fixed maturities 7,812.0 8,085.8
Gross unrealized gains, fixed maturities 172.1 129.6
Gross unrealized losses, fixed maturities 192.6 14.9
Allowance, fixed maturities 0.1  
Fair value, fixed maturities $ 7,791.4 8,200.5
Other-than-temporary impairments in AOCI   $ 31.7