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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale $ 62,781.9 [1] $ 62,530.2 [1] $ 59,631.3
Fixed maturities, trading 585.0 715.3 634.0
Equity securities 46.1 43.0 53.1
Derivative assets 384.7 253.0 256.6
Separate account assets 137,061.8 131,641.7 120,279.6
Investment and universal life contracts $ (230.0) $ (115.5) (46.3)
Fixed maturities valued using internal pricing models      
Fixed maturities classified as Level 3 assets, percent valued using internal pricing models (as a percent) 3.00% 3.00%  
Amount measured at net asset value      
Assets (liabilities) measured at fair value on a recurring basis      
Unfunded commitments of investments measured using NAV $ 7.1 $ 7.1 7.8
U.S. government and agencies      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 1,706.9 1,504.9 1,715.9
Non-U.S. governments      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 489.7 479.9 520.4
States and political subdivisions      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 6,238.8 6,613.3 6,168.3
Corporate debt securities      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 32,294.7 33,079.5 33,184.8
Residential mortgage-backed pass-through securities      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 3,010.6 2,824.9 2,170.9
Commercial mortgage-backed securities      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 4,854.8 4,743.4 4,827.5
Collateralized debt obligations      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 5,867.7 5,397.8 4,560.2
Other debt obligations      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 8,318.7 7,886.5 6,483.3
Recurring Fair Value Measurements      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 62,781.9 62,530.2 59,631.3
Fixed maturities, trading 585.0 715.3 634.0
Equity securities 46.1 43.0 53.1
Derivative assets 384.7 253.0 256.6
Other investments 243.3 238.3 82.8
Cash equivalents 2,547.9 3,010.2 2,776.4
Market risk benefit asset 212.3 153.4 109.2
Sub-total excluding separate account assets 66,801.2 66,943.4 63,543.4
Separate account assets 137,061.8 131,641.7 120,279.6
Total assets 203,863.0 198,585.1 183,823.0
Investment and universal life contracts (230.0) (115.5) (46.3)
Market risk benefit liability (69.3) (111.9) (181.4)
Funds withheld payable embedded derivative 2,874.9 2,326.1 3,652.8
Derivative liabilities (456.7) (473.4) (612.2)
Total liabilities 2,118.9 1,625.3 2,812.9
Net assets (liabilities) 205,981.9 200,210.4 186,635.9
Recurring Fair Value Measurements | Amount measured at net asset value      
Assets (liabilities) measured at fair value on a recurring basis      
Other investments 70.2 73.7 81.4
Sub-total excluding separate account assets 70.2 73.7 81.4
Separate account assets 8,251.2 8,692.0 9,120.9
Total assets 8,321.4 8,765.7 9,202.3
Net assets (liabilities) 8,321.4 8,765.7 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 1,447.0 1,241.7 1,380.6
Fixed maturities, trading 27.9 27.7 78.6
Equity securities 15.3 14.9 14.8
Cash equivalents 249.6 449.6 930.3
Sub-total excluding separate account assets 1,739.8 1,733.9 2,404.3
Separate account assets 108,545.5 103,598.9 91,424.2
Total assets 110,285.3 105,332.8 93,828.5
Net assets (liabilities) 110,285.3 105,332.8 93,828.5
Recurring Fair Value Measurements | Fair value hierarchy Level 2      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 57,565.6 57,653.4 56,085.9
Fixed maturities, trading 238.4 307.8 449.2
Equity securities 30.8 28.1 38.3
Derivative assets 380.7 246.9 256.5
Cash equivalents 2,298.3 2,560.6 1,846.1
Sub-total excluding separate account assets 60,513.8 60,796.8 58,676.0
Separate account assets 19,546.7 18,598.0 18,700.4
Total assets 80,060.5 79,394.8 77,376.4
Derivative liabilities (454.5) (472.6) (608.1)
Total liabilities (454.5) (472.6) (608.1)
Net assets (liabilities) 79,606.0 78,922.2 76,768.3
Recurring Fair Value Measurements | Fair value hierarchy Level 3      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 3,769.3 3,635.1 2,164.8
Fixed maturities, trading 318.7 379.8 106.2
Derivative assets 4.0 6.1 0.1
Other investments 173.1 164.6 1.4
Market risk benefit asset 212.3 153.4 109.2
Sub-total excluding separate account assets 4,477.4 4,339.0 2,381.7
Separate account assets 718.4 752.8 1,034.1
Total assets 5,195.8 5,091.8 3,415.8
Investment and universal life contracts (230.0) (115.5) (46.3)
Market risk benefit liability (69.3) (111.9) (181.4)
Funds withheld payable embedded derivative 2,874.9 2,326.1 3,652.8
Derivative liabilities (2.2) (0.8) (4.1)
Total liabilities 2,573.4 2,097.9 3,421.0
Net assets (liabilities) 7,769.2 7,189.7 6,836.8
Recurring Fair Value Measurements | U.S. government and agencies      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 1,706.9 1,504.9 1,715.9
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 1,416.7 1,210.8 1,354.0
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 290.2 294.1 361.9
Recurring Fair Value Measurements | Non-U.S. governments      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 489.7 479.9 520.4
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 489.7 479.9 520.4
Recurring Fair Value Measurements | States and political subdivisions      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 6,238.8 6,613.3 6,168.3
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 6,155.5 6,545.1 6,099.2
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 83.3 68.2 69.1
Recurring Fair Value Measurements | Corporate debt securities      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 32,294.7 33,079.5 33,184.8
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 30.3 30.9 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 30,035.8 30,742.7 31,589.9
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 2,228.6 2,305.9 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 3,010.6 2,824.9 2,170.9
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 3,010.6 2,824.9 2,170.9
Recurring Fair Value Measurements | Commercial mortgage-backed securities      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 4,854.8 4,743.4 4,827.5
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 4,852.0 4,740.4 4,824.1
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 2.8 3.0 3.4
Recurring Fair Value Measurements | Collateralized debt obligations      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 5,867.7 5,397.8 4,560.2
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 5,763.0 5,322.4 4,504.0
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 104.7 75.4 56.2
Recurring Fair Value Measurements | Other debt obligations      
Assets (liabilities) measured at fair value on a recurring basis      
Fixed maturities, available-for-sale 8,318.7 7,886.5 6,483.3
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 6,968.8 6,703.9 6,015.5
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 $ 1,349.9 $ 1,182.6 $ 467.8
[1] See Note 3, Investments, for further details relating to the amortized cost of fixed maturities, available-for-sale.