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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 64,241.8 $ 62,889.9
Fixed maturities, trading 707.3 760.7
Equity securities 1,830.0 1,708.6
Derivative instruments, assets 361.9 321.6
Separate account assets 164,210.6 155,375.1
Investment and universal life contracts $ (69.6) (46.4)
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%  
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
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,647.4 1,739.8
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 532.3 567.3
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,539.5 6,232.3
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 35,715.0 36,183.2
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,570.1 2,228.7
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,776.0 4,864.6
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 5,021.3 4,566.4
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,440.2 6,507.6
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 64,241.8 62,889.9
Fixed maturities, trading 707.3 760.7
Equity securities 1,830.0 1,708.6
Derivative instruments, assets 361.9 321.6
Other investments 678.1 701.1
Cash equivalents 2,602.9 3,604.1
Market risk benefit asset 148.6 109.2
Sub-total excluding separate account assets 70,570.6 70,095.2
Separate account assets 164,210.6 155,375.1
Total assets 234,781.2 225,470.3
Investment and universal life contracts (69.6) (46.4)
Market risk benefit liability (136.1) (207.4)
Funds withheld payable embedded derivative 3,120.1 3,652.8
Derivative liabilities (529.5) (634.2)
Other liabilities (0.2) (0.4)
Total liabilities 2,384.7 2,764.4
Net assets (liabilities) 237,165.9 228,234.7
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 77.4 81.4
Sub-total excluding separate account assets 77.4 81.4
Separate account assets 8,698.6 9,120.9
Total assets 8,776.0 9,202.3
Net assets (liabilities) 8,776.0 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 1,382.8 1,387.1
Fixed maturities, trading 98.2 78.6
Equity securities 596.4 492.4
Other investments 238.8 311.7
Cash equivalents 69.5 973.5
Sub-total excluding separate account assets 2,385.7 3,243.3
Separate account assets 100,197.3 92,010.7
Total assets 102,583.0 95,254.0
Net assets (liabilities) 102,583.0 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 59,984.6 59,336.2
Fixed maturities, trading 438.1 548.1
Equity securities 1,233.6 1,216.2
Derivative instruments, assets 358.9 320.9
Other investments 360.0 306.1
Cash equivalents 2,533.4 2,630.6
Sub-total excluding separate account assets 64,908.6 64,358.1
Separate account assets 54,476.6 53,208.6
Total assets 119,385.2 117,566.7
Derivative liabilities (526.7) (630.1)
Other liabilities (0.2) (0.4)
Total liabilities (526.9) (630.5)
Net assets (liabilities) 118,858.3 116,936.2
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,874.4 2,166.6
Fixed maturities, trading 171.0 134.0
Derivative instruments, assets 3.0 0.7
Other investments 1.9 1.9
Market risk benefit asset 148.6 109.2
Sub-total excluding separate account assets 3,198.9 2,412.4
Separate account assets 838.1 1,034.9
Total assets 4,037.0 3,447.3
Investment and universal life contracts (69.6) (46.4)
Market risk benefit liability (136.1) (207.4)
Funds withheld payable embedded derivative 3,120.1 3,652.8
Derivative liabilities (2.8) (4.1)
Total liabilities 2,911.6 3,394.9
Net assets (liabilities) 6,948.6 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 1,647.4 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 1,353.7 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 293.7 380.7
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 532.3 567.3
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 0.3 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 532.0 565.9
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,539.5 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 6,469.5 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 70.0 70.9
Recurring Fair Value Measurements | Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 35,715.0 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 28.8 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 33,867.4 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 1,818.8 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 2,570.1 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 2,570.1 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 4,776.0 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 4,772.8 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 3.2 3.4
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 5,021.3 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 4,955.7 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 65.6 56.2
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,440.2 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 6,523.4 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 $ 916.8 $ 467.8