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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 76,557.1 $ 78,710.3
Fixed maturities, trading 413.5 532.1
Equity securities 2,428.2 2,013.4
Derivative instruments, assets 328.1 463.5
Separate account assets 177,850.5 175,951.4
Investment and universal life contracts $ (355.3) (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 $ 10.8 15.1
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,921.8 2,111.5
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,044.8 1,073.7
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 9,233.0 9,167.8
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 45,544.9 47,354.8
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,882.6 2,986.8
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 5,283.2 4,942.3
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,566.3 4,027.5
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,080.5 7,045.9
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 76,557.1 78,710.3
Fixed maturities, trading 413.5 532.1
Equity securities 2,428.2 2,013.4
Derivative instruments, assets 328.1 463.5
Other investments 784.4 746.3
Cash equivalents 1,786.9 1,466.4
Sub-total excluding separate account assets 82,298.2 83,932.0
Separate account assets 177,850.5 175,951.4
Total assets 260,148.7 259,883.4
Investment and universal life contracts (355.3) (467.8)
Derivative liabilities (242.9) (186.1)
Other liabilities (1.8) (0.4)
Total liabilities (600.0) (654.3)
Net assets (liabilities) 259,548.7 259,229.1
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 92.6 75.7
Sub-total excluding separate account assets 92.6 75.7
Separate account assets 8,165.2 155.8
Total assets 8,257.8 231.5
Net assets (liabilities) 8,257.8 231.5
Recurring Fair Value Measurements | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,648.6 1,769.4
Fixed maturities, trading 0.5 0.5
Equity securities 1,089.9 659.7
Other investments 312.0 252.8
Cash equivalents 65.9 38.3
Sub-total excluding separate account assets 3,116.9 2,720.7
Separate account assets 110,111.4 102,550.5
Total assets 113,228.3 105,271.2
Net assets (liabilities) 113,228.3 105,271.2
Recurring Fair Value Measurements | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 74,015.9 76,580.5
Fixed maturities, trading 413.0 531.6
Equity securities 1,338.3 1,353.7
Derivative instruments, assets 327.4 462.9
Other investments 377.1 385.9
Cash equivalents 1,721.0 1,428.1
Sub-total excluding separate account assets 78,192.7 80,742.7
Separate account assets 58,306.6 64,351.9
Total assets 136,499.3 145,094.6
Derivative liabilities (242.2) (180.4)
Other liabilities (1.8) (0.4)
Total liabilities (244.0) (180.8)
Net assets (liabilities) 136,255.3 144,913.8
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 892.6 360.4
Derivative instruments, assets 0.7 0.6
Other investments 2.7 31.9
Sub-total excluding separate account assets 896.0 392.9
Separate account assets 1,267.3 8,893.2
Total assets 2,163.3 9,286.1
Investment and universal life contracts (355.3) (467.8)
Derivative liabilities (0.7) (5.7)
Total liabilities (356.0) (473.5)
Net assets (liabilities) 1,807.3 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 1,921.8 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 1,606.0 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 315.8 343.2
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,044.8 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 1,043.8 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 9,233.0 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 9,233.0 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 45,544.9 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 41.6  
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 44,697.5 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 805.8 290.8
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 2,882.6 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 2,882.6 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 5,283.2 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 5,269.0 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 14.2 13.2
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,566.3 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 3,515.9 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 50.4 27.2
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,080.5 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 7,058.3 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 $ 22.2 $ 29.2