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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 65,396.9 $ 62,889.9
Fixed maturities, trading 787.9 760.7
Equity securities 1,733.3 1,708.6
Derivative instruments, assets 386.7 321.6
Separate account assets 162,000.8 155,375.1
Investment and universal life contracts (55.5) (46.4)
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 7.8
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 $ 1,829.9 1,739.8
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 549.2 567.3
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,173.4 6,232.3
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 37,296.6 36,183.2
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,794.9 2,228.7
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,927.8 4,864.6
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,902.3 4,566.4
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,922.8 6,507.6
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 65,396.9 62,889.9
Fixed maturities, trading 787.9 760.7
Equity securities 1,733.3 1,708.6
Derivative instruments, assets 386.7 321.6
Other investments 722.9 701.1
Cash equivalents 3,235.1 3,604.1
Market risk benefit asset 107.3 109.2
Sub-total excluding separate account assets 72,370.1 70,095.2
Separate account assets 162,000.8 155,375.1
Total assets 234,370.9 225,470.3
Investment and universal life contracts (55.5) (46.4)
Market risk benefit liability (194.4) (207.4)
Funds withheld payable embedded derivative 3,026.2 3,652.8
Derivative liabilities (508.4) (634.2)
Other liabilities (1.0) (0.4)
Total liabilities 2,266.9 2,764.4
Net assets (liabilities) 236,637.8 228,234.7
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 79.1 81.4
Sub-total excluding separate account assets 79.1 81.4
Separate account assets 8,830.1 9,120.9
Total assets 8,909.2 9,202.3
Net assets (liabilities) 8,909.2 9,202.3
Recurring Fair Value Measurements | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,474.1 1,387.1
Fixed maturities, trading 129.2 78.6
Equity securities 506.9 492.4
Other investments 304.2 311.7
Cash equivalents 565.4 973.5
Sub-total excluding separate account assets 2,979.8 3,243.3
Separate account assets 97,181.5 92,010.7
Total assets 100,161.3 95,254.0
Net assets (liabilities) 100,161.3 95,254.0
Recurring Fair Value Measurements | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 61,164.2 59,336.2
Fixed maturities, trading 502.6 548.1
Equity securities 1,226.4 1,216.2
Derivative instruments, assets 381.7 320.9
Other investments 337.7 306.1
Cash equivalents 2,669.7 2,630.6
Sub-total excluding separate account assets 66,282.3 64,358.1
Separate account assets 55,095.4 53,208.6
Total assets 121,377.7 117,566.7
Derivative liabilities (507.4) (630.1)
Other liabilities (1.0) (0.4)
Total liabilities (508.4) (630.5)
Net assets (liabilities) 120,869.3 116,936.2
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,758.6 2,166.6
Fixed maturities, trading 156.1 134.0
Derivative instruments, assets 5.0 0.7
Other investments 1.9 1.9
Market risk benefit asset 107.3 109.2
Sub-total excluding separate account assets 3,028.9 2,412.4
Separate account assets 893.8 1,034.9
Total assets 3,922.7 3,447.3
Investment and universal life contracts (55.5) (46.4)
Market risk benefit liability (194.4) (207.4)
Funds withheld payable embedded derivative 3,026.2 3,652.8
Derivative liabilities (1.0) (4.1)
Total liabilities 2,775.3 3,394.9
Net assets (liabilities) 6,698.0 6,842.2
Recurring Fair Value Measurements | U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,829.9 1,739.8
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 1,443.9 1,359.1
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 386.0 380.7
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 549.2 567.3
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 0.6 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 548.6 565.9
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,173.4 6,232.3
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 6,101.3 6,161.4
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 72.1 70.9
Recurring Fair Value Measurements | Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 37,296.6 36,183.2
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 29.6 26.6
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 35,612.5 34,588.3
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 1,654.5 1,568.3
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 2,794.9 2,228.7
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 2,794.9 2,228.7
Recurring Fair Value Measurements | Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,927.8 4,864.6
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 4,924.5 4,861.2
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 3.3 3.4
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,902.3 4,566.4
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 4,740.1 4,510.2
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 162.2 56.2
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,922.8 6,507.6
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 6,056.3 6,039.8
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 $ 866.5 $ 467.8