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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | $ 75,740.9 | $ 78,710.3
Fixed maturities, trading | 492.9 | 532.1
Equity securities | 2,526.3 | 2,013.4
Derivative instruments, assets | 337.8 | 463.5
Separate account assets | 177,829.0 | 175,951.4
Investment and universal life contracts | $ (177.1) | (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 | $ 13.5 | 15.1
U.S. government and agencies |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 1,886.8 | 2,111.5
Non-U.S. governments |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 1,053.7 | 1,073.7
States and political subdivisions |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 8,937.1 | 9,167.8
Corporate debt securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 45,189.3 | 47,354.8
Residential mortgage-backed pass-through securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 2,797.8 | 2,986.8
Commercial mortgage-backed securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 4,940.9 | 4,942.3
Collateralized debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 4,150.3 | 4,027.5
Other debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 6,785.0 | 7,045.9
Recurring Fair Value Measurements |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 75,740.9 | 78,710.3
Fixed maturities, trading | 492.9 | 532.1
Equity securities | 2,526.3 | 2,013.4
Derivative instruments, assets | 337.8 | 463.5
Other investments | 743.1 | 746.3
Cash equivalents | 763.9 | 1,466.4
Sub-total excluding separate account assets | 80,604.9 | 83,932.0
Separate account assets | 177,829.0 | 175,951.4
Total assets | 258,433.9 | 259,883.4
Investment and universal life contracts | (177.1) | (467.8)
Derivative liabilities | (173.0) | (186.1)
Other liabilities | (1.5) | (0.4)
Total liabilities | (351.6) | (654.3)
Net assets (liabilities) | 258,082.3 | 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 | 76.5 | 75.7
Sub-total excluding separate account assets | 76.5 | 75.7
Separate account assets | 7,348.2 | 155.8
Total assets | 7,424.7 | 231.5
Net assets (liabilities) | 7,424.7 | 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 | 1,601.5 | 1,769.4
Fixed maturities, trading | 0.5 | 0.5
Equity securities | 1,152.2 | 659.7
Other investments | 233.1 | 252.8
Cash equivalents | 76.5 | 38.3
Sub-total excluding separate account assets | 3,063.8 | 2,720.7
Separate account assets | 104,911.1 | 102,550.5
Total assets | 107,974.9 | 105,271.2
Net assets (liabilities) | 107,974.9 | 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 | 73,424.8 | 76,580.5
Fixed maturities, trading | 492.4 | 531.6
Equity securities | 1,374.1 | 1,353.7
Derivative instruments, assets | 337.1 | 462.9
Other investments | 392.4 | 385.9
Cash equivalents | 687.4 | 1,428.1
Sub-total excluding separate account assets | 76,708.2 | 80,742.7
Separate account assets | 64,373.5 | 64,351.9
Total assets | 141,081.7 | 145,094.6
Derivative liabilities | (161.6) | (180.4)
Other liabilities | (1.5) | (0.4)
Total liabilities | (163.1) | (180.8)
Net assets (liabilities) | 140,918.6 | 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 | 714.6 | 360.4
Derivative instruments, assets | 0.7 | 0.6
Other investments | 41.1 | 31.9
Sub-total excluding separate account assets | 756.4 | 392.9
Separate account assets | 1,196.2 | 8,893.2
Total assets | 1,952.6 | 9,286.1
Investment and universal life contracts | (177.1) | (467.8)
Derivative liabilities | (11.4) | (5.7)
Total liabilities | (188.5) | (473.5)
Net assets (liabilities) | 1,764.1 | 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 | 1,886.8 | 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 | 1,570.7 | 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 | 316.1 | 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 | 1,053.7 | 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 | 0.9 | 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 | 1,052.8 | 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 | 8,937.1 | 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 | 8,937.1 | 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 | 45,189.3 | 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 | 29.9 |
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 | 44,816.1 | 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 | 343.3 | 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 | 2,797.8 | 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 | 2,797.8 | 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 | 4,940.9 | 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 | 4,929.4 | 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 | 11.5 | 13.2
Recurring Fair Value Measurements | Collateralized debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 4,150.3 | 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 | 3,827.0 | 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 | 323.3 | 27.2
Recurring Fair Value Measurements | Other debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 6,785.0 | 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 | 6,748.5 | 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 | $ 36.5 | $ 29.2

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