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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | $ 65,396.9 | $ 62,889.9
Fixed maturities, trading | 787.9 | 760.7
Equity securities | 1,733.3 | 1,708.6
Derivative instruments, assets | 386.7 | 321.6
Separate account assets | 162,000.8 | 155,375.1
Investment and universal life contracts | (55.5) | (46.4)
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 | 7.8
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 | $ 1,829.9 | 1,739.8
Non-U.S. governments |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 549.2 | 567.3
States and political subdivisions |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 6,173.4 | 6,232.3
Corporate debt securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 37,296.6 | 36,183.2
Residential mortgage-backed pass-through securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 2,794.9 | 2,228.7
Commercial mortgage-backed securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 4,927.8 | 4,864.6
Collateralized debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 4,902.3 | 4,566.4
Other debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 6,922.8 | 6,507.6
Recurring Fair Value Measurements |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 65,396.9 | 62,889.9
Fixed maturities, trading | 787.9 | 760.7
Equity securities | 1,733.3 | 1,708.6
Derivative instruments, assets | 386.7 | 321.6
Other investments | 722.9 | 701.1
Cash equivalents | 3,235.1 | 3,604.1
Market risk benefit asset | 107.3 | 109.2
Sub-total excluding separate account assets | 72,370.1 | 70,095.2
Separate account assets | 162,000.8 | 155,375.1
Total assets | 234,370.9 | 225,470.3
Investment and universal life contracts | (55.5) | (46.4)
Market risk benefit liability | (194.4) | (207.4)
Funds withheld payable embedded derivative | 3,026.2 | 3,652.8
Derivative liabilities | (508.4) | (634.2)
Other liabilities | (1.0) | (0.4)
Total liabilities | 2,266.9 | 2,764.4
Net assets (liabilities) | 236,637.8 | 228,234.7
Recurring Fair Value Measurements | Amount measured at net asset value |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Other investments | 79.1 | 81.4
Sub-total excluding separate account assets | 79.1 | 81.4
Separate account assets | 8,830.1 | 9,120.9
Total assets | 8,909.2 | 9,202.3
Net assets (liabilities) | 8,909.2 | 9,202.3
Recurring Fair Value Measurements | Fair value hierarchy Level 1 |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 1,474.1 | 1,387.1
Fixed maturities, trading | 129.2 | 78.6
Equity securities | 506.9 | 492.4
Other investments | 304.2 | 311.7
Cash equivalents | 565.4 | 973.5
Sub-total excluding separate account assets | 2,979.8 | 3,243.3
Separate account assets | 97,181.5 | 92,010.7
Total assets | 100,161.3 | 95,254.0
Net assets (liabilities) | 100,161.3 | 95,254.0
Recurring Fair Value Measurements | Fair value hierarchy Level 2 |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 61,164.2 | 59,336.2
Fixed maturities, trading | 502.6 | 548.1
Equity securities | 1,226.4 | 1,216.2
Derivative instruments, assets | 381.7 | 320.9
Other investments | 337.7 | 306.1
Cash equivalents | 2,669.7 | 2,630.6
Sub-total excluding separate account assets | 66,282.3 | 64,358.1
Separate account assets | 55,095.4 | 53,208.6
Total assets | 121,377.7 | 117,566.7
Derivative liabilities | (507.4) | (630.1)
Other liabilities | (1.0) | (0.4)
Total liabilities | (508.4) | (630.5)
Net assets (liabilities) | 120,869.3 | 116,936.2
Recurring Fair Value Measurements | Fair value hierarchy Level 3 |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 2,758.6 | 2,166.6
Fixed maturities, trading | 156.1 | 134.0
Derivative instruments, assets | 5.0 | 0.7
Other investments | 1.9 | 1.9
Market risk benefit asset | 107.3 | 109.2
Sub-total excluding separate account assets | 3,028.9 | 2,412.4
Separate account assets | 893.8 | 1,034.9
Total assets | 3,922.7 | 3,447.3
Investment and universal life contracts | (55.5) | (46.4)
Market risk benefit liability | (194.4) | (207.4)
Funds withheld payable embedded derivative | 3,026.2 | 3,652.8
Derivative liabilities | (1.0) | (4.1)
Total liabilities | 2,775.3 | 3,394.9
Net assets (liabilities) | 6,698.0 | 6,842.2
Recurring Fair Value Measurements | U.S. government and agencies |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 1,829.9 | 1,739.8
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 | 1,443.9 | 1,359.1
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 | 386.0 | 380.7
Recurring Fair Value Measurements | Non-U.S. governments |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 549.2 | 567.3
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 | 1.4
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 | 548.6 | 565.9
Recurring Fair Value Measurements | States and political subdivisions |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 6,173.4 | 6,232.3
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 | 6,101.3 | 6,161.4
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 | 72.1 | 70.9
Recurring Fair Value Measurements | Corporate debt securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 37,296.6 | 36,183.2
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 | 29.6 | 26.6
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 | 35,612.5 | 34,588.3
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 | 1,654.5 | 1,568.3
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 | 2,794.9 | 2,228.7
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 | 2,794.9 | 2,228.7
Recurring Fair Value Measurements | Commercial mortgage-backed securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 4,927.8 | 4,864.6
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 | 4,924.5 | 4,861.2
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 | 3.3 | 3.4
Recurring Fair Value Measurements | Collateralized debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 4,902.3 | 4,566.4
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 | 4,740.1 | 4,510.2
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 | 162.2 | 56.2
Recurring Fair Value Measurements | Other debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 6,922.8 | 6,507.6
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 | 6,056.3 | 6,039.8
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 | $ 866.5 | $ 467.8

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