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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 65,673.1 $ 62,889.9
Fixed maturities, trading 836.2 760.7
Equity securities 1,478.1 1,708.6
Derivative instruments, assets 304.2 321.6
Separate account assets 167,605.6 155,375.1
Investment and universal life contracts $ (115.5) (46.4)
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%  
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 7.8
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,528.8 1,739.8
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 507.9 567.3
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,676.8 6,232.3
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 35,810.0 36,183.2
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,061.1 2,228.7
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,775.5 4,864.6
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 5,403.7 4,566.4
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,909.3 6,507.6
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 65,673.1 62,889.9
Fixed maturities, trading 836.2 760.7
Equity securities 1,478.1 1,708.6
Derivative instruments, assets 304.2 321.6
Other investments 815.6 701.1
Cash equivalents 3,771.4 3,604.1
Market risk benefit asset 153.4 109.2
Sub-total excluding separate account assets 73,032.0 70,095.2
Separate account assets 167,605.6 155,375.1
Total assets 240,637.6 225,470.3
Investment and universal life contracts (115.5) (46.4)
Market risk benefit liability (133.2) (207.4)
Funds withheld payable embedded derivative 2,567.1 3,652.8
Derivative liabilities (494.0) (634.2)
Other liabilities (1.0) (0.4)
Total liabilities 1,823.4 2,764.4
Net assets (liabilities) 242,461.0 228,234.7
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 73.7 81.4
Sub-total excluding separate account assets 73.7 81.4
Separate account assets 8,692.0 9,120.9
Total assets 8,765.7 9,202.3
Net assets (liabilities) 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 1,247.1 1,387.1
Fixed maturities, trading 27.7 78.6
Equity securities 245.4 492.4
Other investments 220.1 311.7
Cash equivalents 511.6 973.5
Sub-total excluding separate account assets 2,251.9 3,243.3
Separate account assets 104,505.0 92,010.7
Total assets 106,756.9 95,254.0
Net assets (liabilities) 106,756.9 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 60,789.2 59,336.2
Fixed maturities, trading 392.7 548.1
Equity securities 1,232.7 1,216.2
Derivative instruments, assets 297.9 320.9
Other investments 356.7 306.1
Cash equivalents 3,259.8 2,630.6
Sub-total excluding separate account assets 66,329.0 64,358.1
Separate account assets 53,655.8 53,208.6
Total assets 119,984.8 117,566.7
Derivative liabilities (493.2) (630.1)
Other liabilities (1.0) (0.4)
Total liabilities (494.2) (630.5)
Net assets (liabilities) 119,490.6 116,936.2
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,636.8 2,166.6
Fixed maturities, trading 415.8 134.0
Derivative instruments, assets 6.3 0.7
Other investments 165.1 1.9
Market risk benefit asset 153.4 109.2
Sub-total excluding separate account assets 4,377.4 2,412.4
Separate account assets 752.8 1,034.9
Total assets 5,130.2 3,447.3
Investment and universal life contracts (115.5) (46.4)
Market risk benefit liability (133.2) (207.4)
Funds withheld payable embedded derivative 2,567.1 3,652.8
Derivative liabilities (0.8) (4.1)
Total liabilities 2,317.6 3,394.9
Net assets (liabilities) 7,447.8 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 1,528.8 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 1,216.0 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 312.8 380.7
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 507.9 567.3
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 0.2 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 507.7 565.9
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,676.8 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 6,606.9 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 69.9 70.9
Recurring Fair Value Measurements | Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 35,810.0 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 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 33,473.2 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 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 3,061.1 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 3,061.1 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 4,775.5 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 4,772.5 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 3.0 3.4
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 5,403.7 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 5,328.3 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 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 7,909.3 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 6,726.7 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 $ 1,182.6 $ 467.8