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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | $ 68,707.8 | $ 70,106.2
Fixed maturities, trading | 596.0 | 675.9
Equity securities | 1,664.1 | 1,879.4
Derivative instruments, assets | 617.6 | 294.7
Separate account assets | 136,836.0 | 165,468.0
Investment and universal life contracts | $ (555.4) | (214.2)
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 | $ 17.9 | 19.9
U.S. government and agencies |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 1,731.2 | 1,724.2
Non-U.S. governments |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 956.7 | 996.2
States and political subdivisions |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 7,763.4 | 7,490.0
Corporate debt securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 39,421.2 | 40,647.4
Residential mortgage-backed pass-through securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 3,201.9 | 2,982.4
Commercial mortgage-backed securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 4,493.7 | 4,850.2
Collateralized debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 3,348.3 | 3,215.3
Other debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 7,791.4 | 8,200.5
Recurring Fair Value Measurements |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 68,707.8 | 70,106.2
Fixed maturities, trading | 596.0 | 675.9
Equity securities | 1,664.1 | 1,879.4
Derivative instruments, assets | 617.6 | 294.7
Other investments | 686.6 | 796.0
Cash equivalents | 2,459.1 | 1,299.0
Sub-total excluding separate account assets | 74,731.2 | 75,051.2
Separate account assets | 136,836.0 | 165,468.0
Total assets | 211,567.2 | 240,519.2
Investment and universal life contracts | (555.4) | (214.2)
Derivative liabilities | (210.5) | (217.7)
Other liabilities | (37.5) | (98.9)
Total liabilities | (803.4) | (530.8)
Net assets (liabilities) | 210,763.8 | 239,988.4
Recurring Fair Value Measurements | Amount measured at net asset value |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Other investments | 77.0 | 78.3
Sub-total excluding separate account assets | 77.0 | 78.3
Separate account assets | 140.1 | 129.0
Total assets | 217.1 | 207.3
Net assets (liabilities) | 217.1 | 207.3
Recurring Fair Value Measurements | Fair value hierarchy Level 1 |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 1,389.4 | 1,339.9
Fixed maturities, trading | 0.5 | 0.5
Equity securities | 603.5 | 645.8
Other investments | 226.9 | 335.2
Cash equivalents | 51.3 | 40.9
Sub-total excluding separate account assets | 2,271.6 | 2,362.3
Separate account assets | 76,626.9 | 95,652.5
Total assets | 78,898.5 | 98,014.8
Net assets (liabilities) | 78,898.5 | 98,014.8
Recurring Fair Value Measurements | Fair value hierarchy Level 2 |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 66,857.5 | 68,381.4
Fixed maturities, trading | 595.2 | 675.1
Equity securities | 1,060.6 | 1,233.6
Derivative instruments, assets | 615.9 | 265.4
Other investments | 346.7 | 343.5
Cash equivalents | 2,407.8 | 1,258.1
Sub-total excluding separate account assets | 71,883.7 | 72,157.1
Separate account assets | 51,202.3 | 60,718.5
Total assets | 123,086.0 | 132,875.6
Derivative liabilities | (193.2) | (201.4)
Other liabilities | (37.5) | (98.9)
Total liabilities | (230.7) | (300.3)
Net assets (liabilities) | 122,855.3 | 132,575.3
Recurring Fair Value Measurements | Fair value hierarchy Level 3 |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 460.9 | 384.9
Fixed maturities, trading | 0.3 | 0.3
Derivative instruments, assets | 1.7 | 29.3
Other investments | 36.0 | 39.0
Sub-total excluding separate account assets | 498.9 | 453.5
Separate account assets | 8,866.7 | 8,968.0
Total assets | 9,365.6 | 9,421.5
Investment and universal life contracts | (555.4) | (214.2)
Derivative liabilities | (17.3) | (16.3)
Total liabilities | (572.7) | (230.5)
Net assets (liabilities) | 8,792.9 | 9,191.0
Recurring Fair Value Measurements | U.S. government and agencies |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 1,731.2 | 1,724.2
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 | 1,369.0 | 1,320.0
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 | 362.2 | 404.2
Recurring Fair Value Measurements | Non-U.S. governments |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 956.7 | 996.2
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 | 2.3 | 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 | 954.4 | 994.8
Recurring Fair Value Measurements | States and political subdivisions |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 7,763.4 | 7,490.0
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 | 7,763.4 | 7,490.0
Recurring Fair Value Measurements | Corporate debt securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 39,421.2 | 40,647.4
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 | 18.1 | 18.5
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 | 39,232.8 | 40,547.2
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 | 170.3 | 81.7
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 | 3,201.9 | 2,982.4
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 | 3,201.9 | 2,982.4
Recurring Fair Value Measurements | Commercial mortgage-backed securities |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 4,493.7 | 4,850.2
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 | 4,479.3 | 4,837.3
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 | 14.4 | 12.9
Recurring Fair Value Measurements | Collateralized debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 3,348.3 | 3,215.3
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 | 3,177.0 | 3,016.3
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 | 171.3 | 199.0
Recurring Fair Value Measurements | Other debt obligations |  |
Assets (liabilities) measured at fair value on a recurring basis |  |
Fixed maturities, available-for-sale | 7,791.4 | 8,200.5
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 | 7,686.5 | 8,109.2
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 | $ 104.9 | $ 91.3

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