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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 76,450.4 $ 78,710.3
Fixed maturities, trading 445.2 532.1
Equity securities 2,506.5 2,013.4
Derivative instruments, assets 361.5 463.5
Separate account assets 182,824.6 175,951.4
Investment and universal life contracts $ (281.6) (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 $ 11.8 15.1
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,926.2 2,111.5
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,032.9 1,073.7
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 9,258.8 9,167.8
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 46,047.3 47,354.8
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,774.1 2,986.8
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 5,139.5 4,942.3
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,605.5 4,027.5
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,666.1 7,045.9
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 76,450.4 78,710.3
Fixed maturities, trading 445.2 532.1
Equity securities 2,506.5 2,013.4
Derivative instruments, assets 361.5 463.5
Other investments 839.0 746.3
Cash equivalents 1,152.0 1,466.4
Sub-total excluding separate account assets 81,754.6 83,932.0
Separate account assets 182,824.6 175,951.4
Total assets 264,579.2 259,883.4
Investment and universal life contracts (281.6) (467.8)
Derivative liabilities (178.7) (186.1)
Other liabilities (0.9) (0.4)
Total liabilities (461.2) (654.3)
Net assets (liabilities) 264,118.0 259,229.1
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 81.6 75.7
Sub-total excluding separate account assets 81.6 75.7
Separate account assets 7,614.0 155.8
Total assets 7,695.6 231.5
Net assets (liabilities) 7,695.6 231.5
Recurring Fair Value Measurements | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,647.7 1,769.4
Fixed maturities, trading 0.5 0.5
Equity securities 1,132.0 659.7
Other investments 299.3 252.8
Cash equivalents 45.7 38.3
Sub-total excluding separate account assets 3,125.2 2,720.7
Separate account assets 111,657.0 102,550.5
Total assets 114,782.2 105,271.2
Net assets (liabilities) 114,782.2 105,271.2
Recurring Fair Value Measurements | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 73,985.1 76,580.5
Fixed maturities, trading 444.7 531.6
Equity securities 1,374.5 1,353.7
Derivative instruments, assets 360.8 462.9
Other investments 413.6 385.9
Cash equivalents 1,106.3 1,428.1
Sub-total excluding separate account assets 77,685.0 80,742.7
Separate account assets 62,336.2 64,351.9
Total assets 140,021.2 145,094.6
Derivative liabilities (169.1) (180.4)
Other liabilities (0.9) (0.4)
Total liabilities (170.0) (180.8)
Net assets (liabilities) 139,851.2 144,913.8
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 817.6 360.4
Derivative instruments, assets 0.7 0.6
Other investments 44.5 31.9
Sub-total excluding separate account assets 862.8 392.9
Separate account assets 1,217.4 8,893.2
Total assets 2,080.2 9,286.1
Investment and universal life contracts (281.6) (467.8)
Derivative liabilities (9.6) (5.7)
Total liabilities (291.2) (473.5)
Net assets (liabilities) 1,789.0 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 1,926.2 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 1,605.6 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 320.6 343.2
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,032.9 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 1.0 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 1,031.9 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 9,258.8 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 9,258.8 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 46,047.3 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 41.1  
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 45,457.2 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 549.0 290.8
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 2,774.1 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 2,774.1 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 5,139.5 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 5,127.9 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 11.6 13.2
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,605.5 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 3,409.9 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 195.6 27.2
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,666.1 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 6,604.7 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 $ 61.4 $ 29.2