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Investments - Fixed Maturities and Equity Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Available-for-sale securities      
Amortized cost, fixed maturities $ 68,052.7   $ 65,302.5
Gross unrealized gains, fixed maturities 6,837.5   4,927.7
Gross unrealized losses, fixed maturities 613.8   124.0
Allowance, fixed maturities 7.2 $ 7.6  
Fair value, fixed maturities 74,269.2   70,106.2
Other-than-temporary impairments in AOCI     48.4
Accrued interest receivable 548.8    
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 1,609.1   1,627.0
Gross unrealized gains, fixed maturities 266.1   100.2
Gross unrealized losses, fixed maturities 0.2   3.0
Fair value, fixed maturities 1,875.0   1,724.2
Non-U.S. governments      
Available-for-sale securities      
Amortized cost, fixed maturities 837.0   852.3
Gross unrealized gains, fixed maturities 169.9   144.1
Gross unrealized losses, fixed maturities     0.2
Fair value, fixed maturities 1,006.9   996.2
States and political subdivisions      
Available-for-sale securities      
Amortized cost, fixed maturities 7,716.7   6,857.1
Gross unrealized gains, fixed maturities 1,015.0   644.5
Gross unrealized losses, fixed maturities 18.1   11.6
Fair value, fixed maturities 8,713.6   7,490.0
Corporate debt securities      
Available-for-sale securities      
Amortized cost, fixed maturities 38,968.1   36,993.1
Gross unrealized gains, fixed maturities 4,900.6   3,706.5
Gross unrealized losses, fixed maturities 279.1   52.2
Allowance, fixed maturities 2.8 7.0  
Fair value, fixed maturities 43,586.8   40,647.4
Residential mortgage-backed pass-through securities      
Available-for-sale securities      
Amortized cost, fixed maturities 3,164.1   2,913.9
Gross unrealized gains, fixed maturities 159.9   72.3
Gross unrealized losses, fixed maturities 0.4   3.8
Fair value, fixed maturities 3,323.6   2,982.4
Commercial mortgage-backed securities      
Available-for-sale securities      
Amortized cost, fixed maturities 4,785.7   4,746.6
Gross unrealized gains, fixed maturities 74.4   127.6
Gross unrealized losses, fixed maturities 150.2   24.0
Allowance, fixed maturities 3.4 0.4  
Fair value, fixed maturities 4,706.5   4,850.2
Other-than-temporary impairments in AOCI     15.8
Collateralized debt obligations      
Available-for-sale securities      
Amortized cost, fixed maturities 3,592.9   3,226.7
Gross unrealized gains, fixed maturities 5.0   2.9
Gross unrealized losses, fixed maturities 90.9   14.3
Allowance, fixed maturities 1.0 0.1  
Fair value, fixed maturities 3,506.0   3,215.3
Other-than-temporary impairments in AOCI     0.9
Other debt obligations      
Available-for-sale securities      
Amortized cost, fixed maturities 7,379.1   8,085.8
Gross unrealized gains, fixed maturities 246.6   129.6
Gross unrealized losses, fixed maturities 74.9   14.9
Allowance, fixed maturities   $ 0.1  
Fair value, fixed maturities $ 7,550.8   8,200.5
Other-than-temporary impairments in AOCI     $ 31.7