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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 67,205.6 $ 78,154.5
Fixed maturities, trading 391.3 422.2
Equity securities 1,699.8 2,347.2
Derivative instruments, assets 257.4 337.1
Separate account assets 153,819.3 182,345.4
Investment and universal life contracts $ (75.5) (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) 2.00%  
Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Unfunded commitments of investments measured using NAV $ 8.5 10.2
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,268.6 2,088.6
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 679.8 982.0
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,170.6 9,304.4
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 39,793.2 45,944.4
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,899.3 3,152.9
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 5,291.6 5,562.2
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,641.4 3,559.6
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,461.1 7,560.4
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 67,205.6 78,154.5
Fixed maturities, trading 391.3 422.2
Equity securities 1,699.8 2,347.2
Derivative instruments, assets 257.4 337.1
Other investments 746.7 896.2
Cash equivalents 1,870.4 1,117.8
Sub-total excluding separate account assets 72,171.2 83,275.0
Separate account assets 153,819.3 182,345.4
Total assets 225,990.5 265,620.4
Investment and universal life contracts (75.5) (356.3)
Funds withheld payable embedded derivative 3,067.3  
Derivative liabilities (566.6) (226.0)
Other liabilities (0.8) (0.7)
Total liabilities 2,424.4 (583.0)
Net assets (liabilities) 228,414.9 265,037.4
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 93.1 92.7
Sub-total excluding separate account assets 93.1 92.7
Separate account assets 9,806.7 8,942.9
Total assets 9,899.8 9,035.6
Net assets (liabilities) 9,899.8 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 1,900.2 1,758.6
Fixed maturities, trading 0.5 0.5
Equity securities 525.6 1,027.5
Other investments 314.8 395.3
Cash equivalents 24.5 14.2
Sub-total excluding separate account assets 2,765.6 3,196.1
Separate account assets 92,550.8 115,261.7
Total assets 95,316.4 118,457.8
Other liabilities (0.2)  
Total liabilities (0.2)  
Net assets (liabilities) 95,316.2 118,457.8
Recurring Fair Value Measurements | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 63,944.1 75,319.7
Fixed maturities, trading 305.1 416.8
Equity securities 1,174.2 1,319.7
Derivative instruments, assets 257.4 336.5
Other investments 337.4 406.1
Cash equivalents 1,845.9 1,103.6
Sub-total excluding separate account assets 67,864.1 78,902.4
Separate account assets 50,403.2 57,195.5
Total assets 118,267.3 136,097.9
Derivative liabilities (566.4) (225.4)
Other liabilities (0.6) (0.7)
Total liabilities (567.0) (226.1)
Net assets (liabilities) 117,700.3 135,871.8
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,361.3 1,076.2
Fixed maturities, trading 85.7 4.9
Derivative instruments, assets   0.6
Other investments 1.4 2.1
Sub-total excluding separate account assets 1,448.4 1,083.8
Separate account assets 1,058.6 945.3
Total assets 2,507.0 2,029.1
Investment and universal life contracts (75.5) (356.3)
Funds withheld payable embedded derivative 3,067.3  
Derivative liabilities (0.2) (0.6)
Total liabilities 2,991.6 (356.9)
Net assets (liabilities) 5,498.6 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 2,268.6 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 1,870.2 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 398.4 372.1
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 679.8 982.0
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 0.3 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 679.5 981.4
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,170.6 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 7,083.9 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 86.7 94.8
Recurring Fair Value Measurements | Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 39,793.2 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 29.7 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 38,514.8 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 1,248.7 834.3
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 1,899.3 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 1,899.3 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 5,291.6 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 5,287.8 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 3.8 19.2
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,641.4 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 3,640.1 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 1.3 85.8
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,461.1 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 6,440.3 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 $ 20.8 $ 42.1