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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
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