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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 62,889.9 $ 78,154.5
Fixed maturities, trading 760.7 422.2
Equity securities 1,708.6 2,347.2
Derivative instruments, assets 321.6 337.1
Separate account assets 155,375.1 182,345.4
Investment and universal life contracts 31.8 (356.3)
Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Unfunded commitments of investments measured using NAV $ 7.8 10.2
Maximum    
Fixed maturities valued using internal pricing models    
Maximum fixed maturities classified as Level 3 assets, percent valued using internal pricing models (as a percent) 4.00%  
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 1,739.8 2,088.6
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 567.3 982.0
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,232.3 9,304.4
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 36,183.2 45,944.4
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,228.7 3,152.9
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,864.6 5,562.2
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,566.4 3,559.6
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,507.6 7,560.4
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 62,889.9 78,154.5
Fixed maturities, trading 760.7 422.2
Equity securities 1,708.6 2,347.2
Derivative instruments, assets 321.6 337.1
Other investments 701.1 896.2
Cash equivalents 3,604.1 1,117.8
Sub-total excluding separate account assets 69,986.0 83,275.0
Separate account assets 155,375.1 182,345.4
Total assets 225,361.1 265,620.4
Investment and universal life contracts 31.8 (356.3)
Funds withheld payable embedded derivative 3,652.8  
Derivative liabilities (634.2) (226.0)
Other liabilities (0.4) (0.7)
Total liabilities 3,050.0 (583.0)
Net assets (liabilities) 228,411.1 265,037.4
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 81.4 92.7
Sub-total excluding separate account assets 81.4 92.7
Separate account assets 9,120.9 8,942.9
Total assets 9,202.3 9,035.6
Net assets (liabilities) 9,202.3 9,035.6
Recurring Fair Value Measurements | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,387.1 1,758.6
Fixed maturities, trading 78.6 0.5
Equity securities 492.4 1,027.5
Other investments 311.7 395.3
Cash equivalents 973.5 14.2
Sub-total excluding separate account assets 3,243.3 3,196.1
Separate account assets 92,010.7 115,261.7
Total assets 95,254.0 118,457.8
Net assets (liabilities) 95,254.0 118,457.8
Recurring Fair Value Measurements | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 59,336.2 75,319.7
Fixed maturities, trading 548.1 416.8
Equity securities 1,216.2 1,319.7
Derivative instruments, assets 320.9 336.5
Other investments 306.1 406.1
Cash equivalents 2,630.6 1,103.6
Sub-total excluding separate account assets 64,358.1 78,902.4
Separate account assets 53,208.6 57,195.5
Total assets 117,566.7 136,097.9
Derivative liabilities (630.1) (225.4)
Other liabilities (0.4) (0.7)
Total liabilities (630.5) (226.1)
Net assets (liabilities) 116,936.2 135,871.8
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,166.6 1,076.2
Fixed maturities, trading 134.0 4.9
Derivative instruments, assets 0.7 0.6
Other investments 1.9 2.1
Sub-total excluding separate account assets 2,303.2 1,083.8
Separate account assets 1,034.9 945.3
Total assets 3,338.1 2,029.1
Investment and universal life contracts 31.8 (356.3)
Funds withheld payable embedded derivative 3,652.8  
Derivative liabilities (4.1) (0.6)
Total liabilities 3,680.5 (356.9)
Net assets (liabilities) 7,018.6 1,672.2
Recurring Fair Value Measurements | U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,739.8 2,088.6
Recurring Fair Value Measurements | U.S. government and agencies | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,359.1 1,716.5
Recurring Fair Value Measurements | U.S. government and agencies | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 380.7 372.1
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 567.3 982.0
Recurring Fair Value Measurements | Non-U.S. governments | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1.4 0.6
Recurring Fair Value Measurements | Non-U.S. governments | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 565.9 981.4
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,232.3 9,304.4
Recurring Fair Value Measurements | States and political subdivisions | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,161.4 9,209.6
Recurring Fair Value Measurements | States and political subdivisions | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 70.9 94.8
Recurring Fair Value Measurements | Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 36,183.2 45,944.4
Recurring Fair Value Measurements | Corporate debt securities | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 26.6 41.5
Recurring Fair Value Measurements | Corporate debt securities | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 34,588.3 45,068.6
Recurring Fair Value Measurements | Corporate debt securities | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,568.3 834.3
Recurring Fair Value Measurements | Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,228.7 3,152.9
Recurring Fair Value Measurements | Residential mortgage-backed pass-through securities | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,228.7 3,152.9
Recurring Fair Value Measurements | Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,864.6 5,562.2
Recurring Fair Value Measurements | Commercial mortgage-backed securities | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,861.2 5,543.0
Recurring Fair Value Measurements | Commercial mortgage-backed securities | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3.4 19.2
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,566.4 3,559.6
Recurring Fair Value Measurements | Collateralized debt obligations | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,510.2 3,473.8
Recurring Fair Value Measurements | Collateralized debt obligations | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 56.2 85.8
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,507.6 7,560.4
Recurring Fair Value Measurements | Other debt obligations | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,039.8 7,518.3
Recurring Fair Value Measurements | Other debt obligations | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 467.8 $ 42.1