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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 76,494.1 $ 70,106.2
Fixed maturities, trading 560.2 675.9
Equity securities 1,862.7 1,879.4
Derivative instruments, assets 475.6 294.7
Separate account assets 160,737.3 165,468.0
Investment and universal life contracts $ (552.4) (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 $ 11.8 19.9
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,960.1 1,724.2
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,032.8 996.2
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 8,967.8 7,490.0
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 45,496.8 40,647.4
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,042.3 2,982.4
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,871.4 4,850.2
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,737.2 3,215.3
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,385.7 8,200.5
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 76,494.1 70,106.2
Fixed maturities, trading 560.2 675.9
Equity securities 1,862.7 1,879.4
Derivative instruments, assets 475.6 294.7
Other investments 748.1 796.0
Cash equivalents 2,222.7 1,299.0
Sub-total excluding separate account assets 82,363.4 75,051.2
Separate account assets 160,737.3 165,468.0
Total assets 243,100.7 240,519.2
Investment and universal life contracts (552.4) (214.2)
Derivative liabilities (160.3) (217.7)
Other liabilities (1.2) (98.9)
Total liabilities (713.9) (530.8)
Net assets (liabilities) 242,386.8 239,988.4
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 78.6 78.3
Sub-total excluding separate account assets 78.6 78.3
Separate account assets 140.3 129.0
Total assets 218.9 207.3
Net assets (liabilities) 218.9 207.3
Recurring Fair Value Measurements | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,608.9 1,339.9
Fixed maturities, trading 0.5 0.5
Equity securities 636.6 645.8
Other investments 265.7 335.2
Cash equivalents 103.0 40.9
Sub-total excluding separate account assets 2,614.7 2,362.3
Separate account assets 92,025.8 95,652.5
Total assets 94,640.5 98,014.8
Net assets (liabilities) 94,640.5 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 74,543.4 68,381.4
Fixed maturities, trading 559.7 675.1
Equity securities 1,226.1 1,233.6
Derivative instruments, assets 475.1 265.4
Other investments 373.4 343.5
Cash equivalents 2,119.7 1,258.1
Sub-total excluding separate account assets 79,297.4 72,157.1
Separate account assets 59,716.0 60,718.5
Total assets 139,013.4 132,875.6
Derivative liabilities (149.4) (201.4)
Other liabilities (1.2) (98.9)
Total liabilities (150.6) (300.3)
Net assets (liabilities) 138,862.8 132,575.3
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 341.8 384.9
Fixed maturities, trading   0.3
Derivative instruments, assets 0.5 29.3
Other investments 30.4 39.0
Sub-total excluding separate account assets 372.7 453.5
Separate account assets 8,855.2 8,968.0
Total assets 9,227.9 9,421.5
Investment and universal life contracts (552.4) (214.2)
Derivative liabilities (10.9) (16.3)
Total liabilities (563.3) (230.5)
Net assets (liabilities) 8,664.6 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 1,960.1 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 1,607.9 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 352.2 404.2
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,032.8 996.2
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 1.0 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 1,031.8 994.8
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 8,967.8 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 8,967.8 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 45,496.8 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   18.5
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 45,215.5 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 281.3 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 3,042.3 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 3,042.3 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 4,871.4 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 4,858.4 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 13.0 12.9
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,737.2 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 3,718.8 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 18.4 199.0
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,385.7 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 7,356.6 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 $ 29.1 $ 91.3