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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | $ 76,450.4 | $ 78,710.3
Fixed maturities, trading | 445.2 | 532.1
Equity securities | 2,506.5 | 2,013.4
Derivative instruments, assets | 361.5 | 463.5
Separate account assets | 182,824.6 | 175,951.4
Investment and universal life contracts | $ (281.6) | (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 | $ 11.8 | 15.1
U.S. government and agencies |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 1,926.2 | 2,111.5
Non-U.S. governments |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 1,032.9 | 1,073.7
States and political subdivisions |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 9,258.8 | 9,167.8
Corporate debt securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 46,047.3 | 47,354.8
Residential mortgage-backed pass-through securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 2,774.1 | 2,986.8
Commercial mortgage-backed securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 5,139.5 | 4,942.3
Collateralized debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 3,605.5 | 4,027.5
Other debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 6,666.1 | 7,045.9
Recurring Fair Value Measurements |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 76,450.4 | 78,710.3
Fixed maturities, trading | 445.2 | 532.1
Equity securities | 2,506.5 | 2,013.4
Derivative instruments, assets | 361.5 | 463.5
Other investments | 839.0 | 746.3
Cash equivalents | 1,152.0 | 1,466.4
Sub-total excluding separate account assets | 81,754.6 | 83,932.0
Separate account assets | 182,824.6 | 175,951.4
Total assets | 264,579.2 | 259,883.4
Investment and universal life contracts | (281.6) | (467.8)
Derivative liabilities | (178.7) | (186.1)
Other liabilities | (0.9) | (0.4)
Total liabilities | (461.2) | (654.3)
Net assets (liabilities) | 264,118.0 | 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 | 81.6 | 75.7
Sub-total excluding separate account assets | 81.6 | 75.7
Separate account assets | 7,614.0 | 155.8
Total assets | 7,695.6 | 231.5
Net assets (liabilities) | 7,695.6 | 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 | 1,647.7 | 1,769.4
Fixed maturities, trading | 0.5 | 0.5
Equity securities | 1,132.0 | 659.7
Other investments | 299.3 | 252.8
Cash equivalents | 45.7 | 38.3
Sub-total excluding separate account assets | 3,125.2 | 2,720.7
Separate account assets | 111,657.0 | 102,550.5
Total assets | 114,782.2 | 105,271.2
Net assets (liabilities) | 114,782.2 | 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 | 73,985.1 | 76,580.5
Fixed maturities, trading | 444.7 | 531.6
Equity securities | 1,374.5 | 1,353.7
Derivative instruments, assets | 360.8 | 462.9
Other investments | 413.6 | 385.9
Cash equivalents | 1,106.3 | 1,428.1
Sub-total excluding separate account assets | 77,685.0 | 80,742.7
Separate account assets | 62,336.2 | 64,351.9
Total assets | 140,021.2 | 145,094.6
Derivative liabilities | (169.1) | (180.4)
Other liabilities | (0.9) | (0.4)
Total liabilities | (170.0) | (180.8)
Net assets (liabilities) | 139,851.2 | 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 | 817.6 | 360.4
Derivative instruments, assets | 0.7 | 0.6
Other investments | 44.5 | 31.9
Sub-total excluding separate account assets | 862.8 | 392.9
Separate account assets | 1,217.4 | 8,893.2
Total assets | 2,080.2 | 9,286.1
Investment and universal life contracts | (281.6) | (467.8)
Derivative liabilities | (9.6) | (5.7)
Total liabilities | (291.2) | (473.5)
Net assets (liabilities) | 1,789.0 | 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 | 1,926.2 | 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 | 1,605.6 | 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 | 320.6 | 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 | 1,032.9 | 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 | 1.0 | 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 | 1,031.9 | 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 | 9,258.8 | 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 | 9,258.8 | 9,167.8
Recurring Fair Value Measurements | Corporate debt securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 46,047.3 | 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 | 41.1 |
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 | 45,457.2 | 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 | 549.0 | 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 | 2,774.1 | 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 | 2,774.1 | 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 | 5,139.5 | 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 | 5,127.9 | 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 | 11.6 | 13.2
Recurring Fair Value Measurements | Collateralized debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 3,605.5 | 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 | 3,409.9 | 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 | 195.6 | 27.2
Recurring Fair Value Measurements | Other debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 6,666.1 | 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 | 6,604.7 | 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 | $ 61.4 | $ 29.2

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