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Investments - Fixed Maturities and Equity Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Available-for-sale securities      
Amortized cost, fixed maturities $ 69,353.9   $ 65,302.5
Gross unrealized gains, fixed maturities 7,501.4   4,927.7
Gross unrealized losses, fixed maturities 349.1   124.0
Allowance, fixed maturities 12.1 $ 7.2  
Fair value, fixed maturities 76,494.1   70,106.2
Other-than-temporary impairments in AOCI     48.4
Accrued interest receivable 571.9    
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 1,701.3   1,627.0
Gross unrealized gains, fixed maturities 262.8   100.2
Gross unrealized losses, fixed maturities 4.0   3.0
Fair value, fixed maturities 1,960.1   1,724.2
Non-U.S. governments      
Available-for-sale securities      
Amortized cost, fixed maturities 849.9   852.3
Gross unrealized gains, fixed maturities 182.9   144.1
Gross unrealized losses, fixed maturities     0.2
Fair value, fixed maturities 1,032.8   996.2
States and political subdivisions      
Available-for-sale securities      
Amortized cost, fixed maturities 7,870.4   6,857.1
Gross unrealized gains, fixed maturities 1,109.0   644.5
Gross unrealized losses, fixed maturities 11.6   11.6
Fair value, fixed maturities 8,967.8   7,490.0
Corporate debt securities      
Available-for-sale securities      
Amortized cost, fixed maturities 40,363.8   36,993.1
Gross unrealized gains, fixed maturities 5,341.2   3,706.5
Gross unrealized losses, fixed maturities 202.0   52.2
Allowance, fixed maturities 6.2 2.8  
Fair value, fixed maturities 45,496.8   40,647.4
Residential mortgage-backed pass-through securities      
Available-for-sale securities      
Amortized cost, fixed maturities 2,906.3   2,913.9
Gross unrealized gains, fixed maturities 136.4   72.3
Gross unrealized losses, fixed maturities 0.4   3.8
Fair value, fixed maturities 3,042.3   2,982.4
Commercial mortgage-backed securities      
Available-for-sale securities      
Amortized cost, fixed maturities 4,719.4   4,746.6
Gross unrealized gains, fixed maturities 196.8   127.6
Gross unrealized losses, fixed maturities 40.8   24.0
Allowance, fixed maturities 4.0 3.4  
Fair value, fixed maturities 4,871.4   4,850.2
Other-than-temporary impairments in AOCI     15.8
Collateralized debt obligations      
Available-for-sale securities      
Amortized cost, fixed maturities 3,779.4   3,226.7
Gross unrealized gains, fixed maturities 6.1   2.9
Gross unrealized losses, fixed maturities 46.4   14.3
Allowance, fixed maturities 1.9 $ 1.0  
Fair value, fixed maturities 3,737.2   3,215.3
Other-than-temporary impairments in AOCI     0.9
Other debt obligations      
Available-for-sale securities      
Amortized cost, fixed maturities 7,163.4   8,085.8
Gross unrealized gains, fixed maturities 266.2   129.6
Gross unrealized losses, fixed maturities 43.9   14.9
Fair value, fixed maturities $ 7,385.7   8,200.5
Other-than-temporary impairments in AOCI     $ 31.7