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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 78,154.5 $ 78,710.3
Fixed maturities, trading 422.2 532.1
Equity securities 2,347.2 2,013.4
Derivative instruments, assets 337.1 463.5
Separate account assets 182,345.4 175,951.4
Investment and universal life contracts $ (356.3) (467.8)
Fixed maturities valued using internal pricing models    
Fixed maturities classified as Level 3 assets, percent valued using internal pricing models (as a percent) 1.00%  
Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Unfunded commitments of investments measured using NAV $ 10.2 15.1
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,088.6 2,111.5
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 982.0 1,073.7
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 9,304.4 9,167.8
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 45,944.4 47,354.8
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,152.9 2,986.8
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 5,562.2 4,942.3
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,559.6 4,027.5
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,560.4 7,045.9
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 78,154.5 78,710.3
Fixed maturities, trading 422.2 532.1
Equity securities 2,347.2 2,013.4
Derivative instruments, assets 337.1 463.5
Other investments 896.2 746.3
Cash equivalents 1,117.8 1,466.4
Sub-total excluding separate account assets 83,275.0 83,932.0
Separate account assets 182,345.4 175,951.4
Total assets 265,620.4 259,883.4
Investment and universal life contracts (356.3) (467.8)
Derivative liabilities (226.0) (186.1)
Other liabilities (0.7) (0.4)
Total liabilities (583.0) (654.3)
Net assets (liabilities) 265,037.4 259,229.1
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 92.7 75.7
Sub-total excluding separate account assets 92.7 75.7
Separate account assets 8,942.9 155.8
Total assets 9,035.6 231.5
Net assets (liabilities) 9,035.6 231.5
Recurring Fair Value Measurements | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,758.6 1,769.4
Fixed maturities, trading 0.5 0.5
Equity securities 1,027.5 659.7
Other investments 395.3 252.8
Cash equivalents 14.2 38.3
Sub-total excluding separate account assets 3,196.1 2,720.7
Separate account assets 115,261.7 102,550.5
Total assets 118,457.8 105,271.2
Net assets (liabilities) 118,457.8 105,271.2
Recurring Fair Value Measurements | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 75,319.7 76,580.5
Fixed maturities, trading 416.8 531.6
Equity securities 1,319.7 1,353.7
Derivative instruments, assets 336.5 462.9
Other investments 406.1 385.9
Cash equivalents 1,103.6 1,428.1
Sub-total excluding separate account assets 78,902.4 80,742.7
Separate account assets 57,195.5 64,351.9
Total assets 136,097.9 145,094.6
Derivative liabilities (225.4) (180.4)
Other liabilities (0.7) (0.4)
Total liabilities (226.1) (180.8)
Net assets (liabilities) 135,871.8 144,913.8
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,076.2 360.4
Fixed maturities, trading 4.9  
Derivative instruments, assets 0.6 0.6
Other investments 2.1 31.9
Sub-total excluding separate account assets 1,083.8 392.9
Separate account assets 945.3 8,893.2
Total assets 2,029.1 9,286.1
Investment and universal life contracts (356.3) (467.8)
Derivative liabilities (0.6) (5.7)
Total liabilities (356.9) (473.5)
Net assets (liabilities) 1,672.2 8,812.6
Recurring Fair Value Measurements | U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,088.6 2,111.5
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 1,716.5 1,768.3
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 372.1 343.2
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 982.0 1,073.7
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 0.6 1.1
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 981.4 1,072.6
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 9,304.4 9,167.8
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 9,209.6 9,167.8
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 94.8  
Recurring Fair Value Measurements | Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 45,944.4 47,354.8
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 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 45,068.6 47,064.0
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 834.3 290.8
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 3,152.9 2,986.8
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 3,152.9 2,986.8
Recurring Fair Value Measurements | Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 5,562.2 4,942.3
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 5,543.0 4,929.1
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 19.2 13.2
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,559.6 4,027.5
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 3,473.8 4,000.3
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 85.8 27.2
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,560.4 7,045.9
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 7,518.3 7,016.7
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 $ 42.1 $ 29.2