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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale | [1] | $ 69,726.7 | $ 68,251.0
Fixed maturities, trading |  | 1,307.2 | 1,023.3
Equity securities |  | 2,428.9 | 2,295.0
Derivative instruments, assets |  | 610.8 | 648.2
Separate account assets |  | 171,266.2 | 173,327.1
Investment and universal life contracts |  | $ (522.7) | (578.4)
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 |  | $ 3.1 | 3.1
U.S. government and agencies |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 1,658.6 | 1,637.9
Non-U.S. governments |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 494.0 | 495.7
States and political subdivisions |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 6,192.9 | 6,076.5
Corporate debt securities |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 36,671.5 | 35,702.6
Residential mortgage-backed pass-through securities |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 3,763.7 | 3,674.2
Commercial mortgage-backed securities |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 5,215.7 | 5,188.0
Collateralized debt obligations |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 6,634.2 | 6,560.4
Other debt obligations |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 9,096.1 | 8,915.7
Recurring Fair Value Measurements |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 69,726.7 | 68,251.0
Fixed maturities, trading |  | 1,307.2 | 1,023.3
Equity securities |  | 2,428.9 | 2,295.0
Mortgage loans |  |  | 140.6
Derivative instruments, assets |  | 610.8 | 648.2
Other investments |  | 910.4 | 905.6
Cash equivalents |  | 2,589.8 | 2,950.5
Market risk benefit asset |  | 158.7 | 199.5
Sub-total excluding separate account assets |  | 77,732.5 | 76,413.7
Separate account assets |  | 171,266.2 | 173,327.1
Total assets |  | 248,998.7 | 249,740.8
Investment and universal life contracts |  | (522.7) | (578.4)
Market risk benefit liability |  | (80.4) | (62.1)
Funds withheld payable embedded derivative |  | 2,804.8 | 3,014.5
Long-term debt |  |  | (21.8)
Derivative liabilities |  | (437.3) | (506.2)
Other liabilities |  | (1.6) | (5.2)
Total liabilities |  | 1,762.8 | 1,840.8
Net assets |  | 250,761.5 | 251,581.6
Recurring Fair Value Measurements | Amount measured at net asset value |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Other investments |  | 109.2 | 106.7
Sub-total excluding separate account assets |  | 109.2 | 106.7
Separate account assets |  | 7,091.1 | 7,573.6
Total assets |  | 7,200.3 | 7,680.3
Net assets |  | 7,200.3 | 7,680.3
Recurring Fair Value Measurements | Fair value hierarchy Level 1 |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 1,290.9 | 1,261.0
Fixed maturities, trading |  | 0.5 |
Equity securities |  | 1,130.2 | 990.2
Other investments |  | 264.4 | 262.2
Cash equivalents |  | 538.7 | 271.6
Sub-total excluding separate account assets |  | 3,224.7 | 2,785.0
Separate account assets |  | 108,513.8 | 112,920.3
Total assets |  | 111,738.5 | 115,705.3
Other liabilities |  | (1.6) | (5.2)
Total liabilities |  | (1.6) | (5.2)
Net assets |  | 111,736.9 | 115,700.1
Recurring Fair Value Measurements | Fair value hierarchy Level 2 |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 64,485.6 | 63,091.8
Fixed maturities, trading |  | 735.6 | 460.7
Equity securities |  | 1,298.7 | 1,304.8
Derivative instruments, assets |  | 606.9 | 626.8
Other investments |  | 418.2 | 405.5
Cash equivalents |  | 2,051.1 | 2,678.9
Sub-total excluding separate account assets |  | 69,596.1 | 68,568.5
Separate account assets |  | 54,923.1 | 52,106.5
Total assets |  | 124,519.2 | 120,675.0
Long-term debt |  |  | (21.8)
Derivative liabilities |  | (431.6) | (498.3)
Total liabilities |  | (431.6) | (520.1)
Net assets |  | 124,087.6 | 120,154.9
Recurring Fair Value Measurements | Fair value hierarchy Level 3 |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 3,950.2 | 3,898.2
Fixed maturities, trading |  | 571.1 | 562.6
Mortgage loans |  |  | 140.6
Derivative instruments, assets |  | 3.9 | 21.4
Other investments |  | 118.6 | 131.2
Market risk benefit asset |  | 158.7 | 199.5
Sub-total excluding separate account assets |  | 4,802.5 | 4,953.5
Separate account assets |  | 738.2 | 726.7
Total assets |  | 5,540.7 | 5,680.2
Investment and universal life contracts |  | (522.7) | (578.4)
Market risk benefit liability |  | (80.4) | (62.1)
Funds withheld payable embedded derivative |  | 2,804.8 | 3,014.5
Derivative liabilities |  | (5.7) | (7.9)
Total liabilities |  | 2,196.0 | 2,366.1
Net assets |  | 7,736.7 | 8,046.3
Recurring Fair Value Measurements | U.S. government and agencies |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 1,658.6 | 1,637.9
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 |  | 1,262.5 | 1,231.9
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 |  | 396.1 | 406.0
Recurring Fair Value Measurements | Non-U.S. governments |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 494.0 | 495.7
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 |  | 494.0 | 495.7
Recurring Fair Value Measurements | States and political subdivisions |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 6,192.9 | 6,076.5
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 |  | 6,124.3 | 6,009.7
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 |  | 68.6 | 66.8
Recurring Fair Value Measurements | Corporate debt securities |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 36,671.5 | 35,702.6
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 |  | 28.4 | 29.1
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 |  | 34,223.8 | 33,323.1
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 |  | 2,419.3 | 2,350.4
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 |  | 3,763.7 | 3,674.2
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 |  | 3,763.7 | 3,674.2
Recurring Fair Value Measurements | Commercial mortgage-backed securities |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 5,215.7 | 5,188.0
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 |  | 5,213.1 | 5,185.3
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 |  | 2.6 | 2.7
Recurring Fair Value Measurements | Collateralized debt obligations |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 6,634.2 | 6,560.4
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 |  | 6,634.2 | 6,560.4
Recurring Fair Value Measurements | Other debt obligations |  |  |
Assets (liabilities) measured at fair value on a recurring basis |  |  |
Fixed maturities, available-for-sale |  | 9,096.1 | 8,915.7
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 |  | 7,636.4 | 7,437.4
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 |  | $ 1,459.7 | $ 1,478.3
[1] | See Note 4, Investments, for further details relating to the amortized cost of fixed maturities, available-for-sale.

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