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Investments - Fixed Maturities and Equity Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Available-for-sale securities    
Amortized cost, fixed maturities $ 70,546.8 $ 65,302.5
Gross unrealized gains, fixed maturities 8,380.0 4,927.7
Gross unrealized losses, fixed maturities 209.1 124.0
Allowance, fixed maturities 7.4  
Fair value, fixed maturities 78,710.3 70,106.2
Other-than-temporary impairments in AOCI   48.4
Accrued interest receivable 552.5  
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 1,893.1 1,627.0
Gross unrealized gains, fixed maturities 228.9 100.2
Gross unrealized losses, fixed maturities 10.5 3.0
Fair value, fixed maturities 2,111.5 1,724.2
Non-U.S. governments    
Available-for-sale securities    
Amortized cost, fixed maturities 881.6 852.3
Gross unrealized gains, fixed maturities 192.1 144.1
Gross unrealized losses, fixed maturities   0.2
Fair value, fixed maturities 1,073.7 996.2
States and political subdivisions    
Available-for-sale securities    
Amortized cost, fixed maturities 8,004.9 6,857.1
Gross unrealized gains, fixed maturities 1,175.5 644.5
Gross unrealized losses, fixed maturities 12.6 11.6
Fair value, fixed maturities 9,167.8 7,490.0
Corporate debt securities    
Available-for-sale securities    
Amortized cost, fixed maturities 41,289.9 36,993.1
Gross unrealized gains, fixed maturities 6,160.9 3,706.5
Gross unrealized losses, fixed maturities 95.1 52.2
Allowance, fixed maturities 0.9  
Fair value, fixed maturities 47,354.8 40,647.4
Residential mortgage-backed pass-through securities    
Available-for-sale securities    
Amortized cost, fixed maturities 2,857.6 2,913.9
Gross unrealized gains, fixed maturities 129.4 72.3
Gross unrealized losses, fixed maturities 0.2 3.8
Fair value, fixed maturities 2,986.8 2,982.4
Commercial mortgage-backed securities    
Available-for-sale securities    
Amortized cost, fixed maturities 4,741.2 4,746.6
Gross unrealized gains, fixed maturities 241.3 127.6
Gross unrealized losses, fixed maturities 35.9 24.0
Allowance, fixed maturities 4.3  
Fair value, fixed maturities 4,942.3 4,850.2
Other-than-temporary impairments in AOCI   15.8
Collateralized debt obligations    
Available-for-sale securities    
Amortized cost, fixed maturities 4,045.9 3,226.7
Gross unrealized gains, fixed maturities 8.7 2.9
Gross unrealized losses, fixed maturities 24.9 14.3
Allowance, fixed maturities 2.2  
Fair value, fixed maturities 4,027.5 3,215.3
Other-than-temporary impairments in AOCI   0.9
Other debt obligations    
Available-for-sale securities    
Amortized cost, fixed maturities 6,832.6 8,085.8
Gross unrealized gains, fixed maturities 243.2 129.6
Gross unrealized losses, fixed maturities 29.9 14.9
Fair value, fixed maturities $ 7,045.9 8,200.5
Other-than-temporary impairments in AOCI   $ 31.7