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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 70,106.2 $ 60,108.5
Fixed maturities, trading 675.9 636.1
Equity securities 1,879.4 1,843.7
Derivative instruments, assets 294.7 194.0
Separate account assets 165,468.0 144,987.9
Investment and universal life contracts $ (214.2) (45.2)
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 $ 19.9 32.0
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,724.2 1,441.0
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 996.2 890.5
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,490.0 6,225.7
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 40,647.4 35,539.3
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,982.4 2,460.6
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,850.2 3,945.6
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,215.3 2,420.8
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 8,200.5 7,185.0
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 70,106.2 60,108.5
Fixed maturities, trading 675.9 636.1
Equity securities 1,879.4 1,843.7
Derivative instruments, assets 294.7 194.0
Other investments 796.0 828.6
Cash equivalents 1,299.0 1,775.9
Sub-total excluding separate account assets 75,051.2 65,386.8
Separate account assets 165,468.0 144,987.9
Total assets 240,519.2 210,374.7
Investment and universal life contracts (214.2) (45.2)
Derivative liabilities (217.7) (157.1)
Other liabilities (98.9) (91.5)
Total liabilities (530.8) (293.8)
Net assets 239,988.4 210,080.9
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 78.3 75.4
Sub-total excluding separate account assets 78.3 75.4
Separate account assets 129.0 124.6
Total assets 207.3 200.0
Net assets 207.3 200.0
Recurring Fair Value Measurements | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,339.9 1,049.7
Fixed maturities, trading 0.5  
Equity securities 645.8 661.2
Other investments 335.2 125.9
Cash equivalents 40.9 46.3
Sub-total excluding separate account assets 2,362.3 1,883.1
Separate account assets 95,652.5 79,572.0
Total assets 98,014.8 81,455.1
Net assets 98,014.8 81,455.1
Recurring Fair Value Measurements | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 68,381.4 58,920.0
Fixed maturities, trading 675.1 636.1
Equity securities 1,233.6 1,182.5
Derivative instruments, assets 265.4 175.4
Other investments 343.5 610.1
Cash equivalents 1,258.1 1,729.6
Sub-total excluding separate account assets 72,157.1 63,253.7
Separate account assets 60,718.5 56,675.8
Total assets 132,875.6 119,929.5
Derivative liabilities (201.4) (141.6)
Other liabilities (98.9) (91.5)
Total liabilities (300.3) (233.1)
Net assets 132,575.3 119,696.4
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 384.9 138.8
Fixed maturities, trading 0.3  
Derivative instruments, assets 29.3 18.6
Other investments 39.0 17.2
Sub-total excluding separate account assets 453.5 174.6
Separate account assets 8,968.0 8,615.5
Total assets 9,421.5 8,790.1
Investment and universal life contracts (214.2) (45.2)
Derivative liabilities (16.3) (15.5)
Total liabilities (230.5) (60.7)
Net assets 9,191.0 8,729.4
Recurring Fair Value Measurements | U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,724.2 1,441.0
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 1,320.0 1,027.8
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 404.2 413.2
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 996.2 890.5
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 1.4 2.7
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 994.8 883.2
Recurring Fair Value Measurements | Non-U.S. governments | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale   4.6
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,490.0 6,225.7
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 7,490.0 6,225.7
Recurring Fair Value Measurements | Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 40,647.4 35,539.3
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 19.2
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 40,547.2 35,462.2
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 81.7 57.9
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 2,982.4 2,460.6
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 2,982.4 2,460.6
Recurring Fair Value Measurements | Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,850.2 3,945.6
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 4,837.3 3,936.1
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 12.9 9.5
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,215.3 2,420.8
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 3,016.3 2,412.5
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 199.0 8.3
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 8,200.5 7,185.0
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 8,109.2 7,126.5
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 $ 91.3 $ 58.5