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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 74,269.2 $ 70,106.2
Fixed maturities, trading 583.8 675.9
Equity securities 1,778.5 1,879.4
Derivative instruments, assets 531.4 294.7
Separate account assets 155,936.3 165,468.0
Investment and universal life contracts $ (576.0) (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 $ 12.4 19.9
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,875.0 1,724.2
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,006.9 996.2
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 8,713.6 7,490.0
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 43,586.8 40,647.4
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,323.6 2,982.4
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,706.5 4,850.2
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,506.0 3,215.3
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,550.8 8,200.5
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 74,269.2 70,106.2
Fixed maturities, trading 583.8 675.9
Equity securities 1,778.5 1,879.4
Derivative instruments, assets 531.4 294.7
Other investments 769.0 796.0
Cash equivalents 2,041.7 1,299.0
Sub-total excluding separate account assets 79,973.6 75,051.2
Separate account assets 155,936.3 165,468.0
Total assets 235,909.9 240,519.2
Investment and universal life contracts (576.0) (214.2)
Derivative liabilities (192.8) (217.7)
Other liabilities (0.1) (98.9)
Total liabilities (768.9) (530.8)
Net assets (liabilities) 235,141.0 239,988.4
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 75.6 78.3
Sub-total excluding separate account assets 75.6 78.3
Separate account assets 135.4 129.0
Total assets 211.0 207.3
Net assets (liabilities) 211.0 207.3
Recurring Fair Value Measurements | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,461.2 1,339.9
Fixed maturities, trading 0.5 0.5
Equity securities 617.9 645.8
Other investments 255.6 335.2
Cash equivalents 69.8 40.9
Sub-total excluding separate account assets 2,405.0 2,362.3
Separate account assets 89,113.4 95,652.5
Total assets 91,518.4 98,014.8
Net assets (liabilities) 91,518.4 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 72,445.9 68,381.4
Fixed maturities, trading 583.3 675.1
Equity securities 1,160.6 1,233.6
Derivative instruments, assets 530.3 265.4
Other investments 399.1 343.5
Cash equivalents 1,971.9 1,258.1
Sub-total excluding separate account assets 77,091.1 72,157.1
Separate account assets 57,866.2 60,718.5
Total assets 134,957.3 132,875.6
Derivative liabilities (177.5) (201.4)
Other liabilities (0.1) (98.9)
Total liabilities (177.6) (300.3)
Net assets (liabilities) 134,779.7 132,575.3
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 362.1 384.9
Fixed maturities, trading   0.3
Derivative instruments, assets 1.1 29.3
Other investments 38.7 39.0
Sub-total excluding separate account assets 401.9 453.5
Separate account assets 8,821.3 8,968.0
Total assets 9,223.2 9,421.5
Investment and universal life contracts (576.0) (214.2)
Derivative liabilities (15.3) (16.3)
Total liabilities (591.3) (230.5)
Net assets (liabilities) 8,631.9 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 1,875.0 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 1,460.2 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 414.8 404.2
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,006.9 996.2
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 1,005.9 994.8
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 8,713.6 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 8,713.6 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 43,586.8 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 43,311.8 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 275.0 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 3,323.6 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 3,323.6 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 4,706.5 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 4,693.4 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 13.1 12.9
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,506.0 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 3,503.2 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 2.8 199.0
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,550.8 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 7,479.6 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 $ 71.2 $ 91.3