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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 78,710.3 $ 70,106.2
Fixed maturities, trading 532.1 675.9
Equity securities 2,013.4 1,879.4
Derivative instruments, assets 463.5 294.7
Separate account assets 175,951.4 165,468.0
Investment and universal life contracts $ (467.8) (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 $ 15.1 19.9
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,111.5 1,724.2
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,073.7 996.2
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 9,167.8 7,490.0
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 47,354.8 40,647.4
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,986.8 2,982.4
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,942.3 4,850.2
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,027.5 3,215.3
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,045.9 8,200.5
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 78,710.3 70,106.2
Fixed maturities, trading 532.1 675.9
Equity securities 2,013.4 1,879.4
Derivative instruments, assets 463.5 294.7
Other investments 746.3 796.0
Cash equivalents 1,466.4 1,299.0
Sub-total excluding separate account assets 83,932.0 75,051.2
Separate account assets 175,951.4 165,468.0
Total assets 259,883.4 240,519.2
Investment and universal life contracts (467.8) (214.2)
Derivative liabilities (186.1) (217.7)
Other liabilities (0.4) (98.9)
Total liabilities (654.3) (530.8)
Net assets (liabilities) 259,229.1 239,988.4
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 75.7 78.3
Sub-total excluding separate account assets 75.7 78.3
Separate account assets 155.8 129.0
Total assets 231.5 207.3
Net assets (liabilities) 231.5 207.3
Recurring Fair Value Measurements | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,769.4 1,339.9
Fixed maturities, trading 0.5 0.5
Equity securities 659.7 645.8
Other investments 252.8 335.2
Cash equivalents 38.3 40.9
Sub-total excluding separate account assets 2,720.7 2,362.3
Separate account assets 102,550.5 95,652.5
Total assets 105,271.2 98,014.8
Net assets (liabilities) 105,271.2 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 76,580.5 68,381.4
Fixed maturities, trading 531.6 675.1
Equity securities 1,353.7 1,233.6
Derivative instruments, assets 462.9 265.4
Other investments 385.9 343.5
Cash equivalents 1,428.1 1,258.1
Sub-total excluding separate account assets 80,742.7 72,157.1
Separate account assets 64,351.9 60,718.5
Total assets 145,094.6 132,875.6
Derivative liabilities (180.4) (201.4)
Other liabilities (0.4) (98.9)
Total liabilities (180.8) (300.3)
Net assets (liabilities) 144,913.8 132,575.3
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 360.4 384.9
Fixed maturities, trading   0.3
Derivative instruments, assets 0.6 29.3
Other investments 31.9 39.0
Sub-total excluding separate account assets 392.9 453.5
Separate account assets 8,893.2 8,968.0
Total assets 9,286.1 9,421.5
Investment and universal life contracts (467.8) (214.2)
Derivative liabilities (5.7) (16.3)
Total liabilities (473.5) (230.5)
Net assets (liabilities) 8,812.6 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 2,111.5 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 1,768.3 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 343.2 404.2
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,073.7 996.2
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 1.1 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 1,072.6 994.8
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 9,167.8 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 9,167.8 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 47,354.8 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 47,064.0 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 290.8 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 2,986.8 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 2,986.8 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 4,942.3 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 4,929.1 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 13.2 12.9
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,027.5 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 4,000.3 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 27.2 199.0
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,045.9 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 7,016.7 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 $ 29.2 $ 91.3