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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 59,631.3 $ 73,896.9
Fixed maturities, trading 634.0 233.3
Equity securities 53.1 508.2
Derivative instruments, assets 256.6 326.2
Separate account assets 120,279.6 147,529.0
Investment and universal life contracts 58.9 (320.9)
Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Unfunded commitments of investments measured using NAV $ 7.8 10.2
Maximum    
Fixed maturities valued using internal pricing models    
Maximum fixed maturities classified as Level 3 assets, percent valued using internal pricing models (as a percent) 4.00%  
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 1,715.9 1,937.0
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 520.4 947.1
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,168.3 9,216.4
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 33,184.8 42,965.1
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,170.9 2,342.3
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,827.5 5,513.7
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,560.2 3,533.5
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,483.3 7,441.8
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 59,631.3 73,896.9
Fixed maturities, trading 634.0 233.3
Equity securities 53.1 508.2
Derivative instruments, assets 256.6 326.2
Other investments 82.8 94.1
Cash equivalents 2,776.4 753.0
Sub-total excluding separate account assets 63,434.2 75,811.7
Separate account assets 120,279.6 147,529.0
Total assets 183,713.8 223,340.7
Investment and universal life contracts 58.9 (320.9)
Funds withheld payable embedded derivative 3,652.8  
Derivative liabilities (612.3) (142.3)
Total liabilities 3,099.4 (463.2)
Net assets (liabilities) 186,813.2 222,877.5
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 81.4 92.7
Sub-total excluding separate account assets 81.4 92.7
Separate account assets 9,120.9 8,942.9
Total assets 9,202.3 9,035.6
Net assets (liabilities) 9,202.3 9,035.6
Recurring Fair Value Measurements | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,380.6 1,628.5
Fixed maturities, trading 78.6 0.5
Equity securities 14.8 463.5
Cash equivalents 930.3  
Sub-total excluding separate account assets 2,404.3 2,092.5
Separate account assets 91,424.2 114,735.5
Total assets 93,828.5 116,828.0
Net assets (liabilities) 93,828.5 116,828.0
Recurring Fair Value Measurements | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 56,085.9 71,194.6
Fixed maturities, trading 449.2 227.9
Equity securities 38.3 44.7
Derivative instruments, assets 256.5 325.6
Cash equivalents 1,846.1 753.0
Sub-total excluding separate account assets 58,676.0 72,545.8
Separate account assets 18,700.4 22,904.6
Total assets 77,376.4 95,450.4
Derivative liabilities (608.2) (142.3)
Total liabilities (608.2) (142.3)
Net assets (liabilities) 76,768.2 95,308.1
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,164.8 1,073.8
Fixed maturities, trading 106.2 4.9
Derivative instruments, assets 0.1 0.6
Other investments 1.4 1.4
Sub-total excluding separate account assets 2,272.5 1,080.7
Separate account assets 1,034.1 946.0
Total assets 3,306.6 2,026.7
Investment and universal life contracts 58.9 (320.9)
Funds withheld payable embedded derivative 3,652.8  
Derivative liabilities (4.1)  
Total liabilities 3,707.6 (320.9)
Net assets (liabilities) 7,014.2 1,705.8
Recurring Fair Value Measurements | U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,715.9 1,937.0
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 1,354.0 1,587.0
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 361.9 350.0
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 520.4 947.1
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 520.4 947.1
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,168.3 9,216.4
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 6,099.2 9,124.0
Recurring Fair Value Measurements | States and political subdivisions | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 69.1 92.4
Recurring Fair Value Measurements | Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 33,184.8 42,965.1
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 26.6 41.5
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 31,589.9 42,089.3
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 1,568.3 834.3
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 2,170.9 2,342.3
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 2,170.9 2,342.3
Recurring Fair Value Measurements | Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,827.5 5,513.7
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 4,824.1 5,494.5
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 3.4 19.2
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,560.2 3,533.5
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 4,504.0 3,447.7
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 56.2 85.8
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,483.3 7,441.8
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 6,015.5 7,399.7
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 $ 467.8 $ 42.1