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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
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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

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