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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 62,409.1 $ 78,154.5
Fixed maturities, trading 702.7 422.2
Equity securities 1,616.2 2,347.2
Derivative instruments, assets 373.0 337.1
Separate account assets 146,571.4 182,345.4
Investment and universal life contracts $ (25.9) (356.3)
Fixed maturities valued using internal pricing models    
Fixed maturities classified as Level 3 assets, percent valued using internal pricing models (as a percent) 3.00%  
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
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,045.5 2,088.6
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 575.5 982.0
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,416.7 9,304.4
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 36,610.1 45,944.4
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,737.8 3,152.9
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,988.3 5,562.2
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,994.7 3,559.6
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,040.5 7,560.4
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 62,409.1 78,154.5
Fixed maturities, trading 702.7 422.2
Equity securities 1,616.2 2,347.2
Derivative instruments, assets 373.0 337.1
Other investments 686.5 896.2
Cash equivalents 2,798.9 1,117.8
Sub-total excluding separate account assets 68,586.4 83,275.0
Separate account assets 146,571.4 182,345.4
Total assets 215,157.8 265,620.4
Investment and universal life contracts (25.9) (356.3)
Funds withheld payable embedded derivative 4,305.0  
Derivative liabilities (716.6) (226.0)
Other liabilities (2.2) (0.7)
Total liabilities 3,560.3 (583.0)
Net assets (liabilities) 218,718.1 265,037.4
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 90.0 92.7
Sub-total excluding separate account assets 90.0 92.7
Separate account assets 9,707.6 8,942.9
Total assets 9,797.6 9,035.6
Net assets (liabilities) 9,797.6 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 1,702.0 1,758.6
Fixed maturities, trading 78.5 0.5
Equity securities 487.7 1,027.5
Other investments 223.4 395.3
Cash equivalents 22.9 14.2
Sub-total excluding separate account assets 2,514.5 3,196.1
Separate account assets 87,723.2 115,261.7
Total assets 90,237.7 118,457.8
Net assets (liabilities) 90,237.7 118,457.8
Recurring Fair Value Measurements | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 58,862.5 75,319.7
Fixed maturities, trading 500.3 416.8
Equity securities 1,128.5 1,319.7
Derivative instruments, assets 373.0 336.5
Other investments 371.7 406.1
Cash equivalents 2,776.0 1,103.6
Sub-total excluding separate account assets 64,012.0 78,902.4
Separate account assets 48,059.2 57,195.5
Total assets 112,071.2 136,097.9
Derivative liabilities (699.2) (225.4)
Other liabilities (2.2) (0.7)
Total liabilities (701.4) (226.1)
Net assets (liabilities) 111,369.8 135,871.8
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,844.6 1,076.2
Fixed maturities, trading 123.9 4.9
Derivative instruments, assets   0.6
Other investments 1.4 2.1
Sub-total excluding separate account assets 1,969.9 1,083.8
Separate account assets 1,081.4 945.3
Total assets 3,051.3 2,029.1
Investment and universal life contracts (25.9) (356.3)
Funds withheld payable embedded derivative 4,305.0  
Derivative liabilities (17.4) (0.6)
Total liabilities 4,261.7 (356.9)
Net assets (liabilities) 7,313.0 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 2,045.5 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 1,671.3 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 374.2 372.1
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 575.5 982.0
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 1.9 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 573.6 981.4
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,416.7 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 6,345.1 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 71.6 94.8
Recurring Fair Value Measurements | Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 36,610.1 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 28.8 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 35,101.8 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 1,479.5 834.3
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 1,737.8 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 1,737.8 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 4,988.3 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 4,984.9 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 3,994.7 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 3,952.0 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 42.7 85.8
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,040.5 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 5,793.1 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 $ 247.4 $ 42.1