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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 61,582.0 $ 62,889.9
Fixed maturities, trading 722.2 760.7
Equity securities 1,760.2 1,708.6
Derivative instruments, assets 279.1 321.6
Separate account assets 155,478.2 155,375.1
Investment and universal life contracts $ (78.8) (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) 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 $ 7.1 7.8
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,458.8 1,739.8
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 478.4 567.3
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,271.0 6,232.3
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 33,669.9 36,183.2
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,683.7 2,228.7
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,659.6 4,864.6
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 5,133.8 4,566.4
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,226.8 6,507.6
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 61,582.0 62,889.9
Fixed maturities, trading 722.2 760.7
Equity securities 1,760.2 1,708.6
Derivative instruments, assets 279.1 321.6
Other investments 757.0 701.1
Cash equivalents 3,194.3 3,604.1
Market risk benefit asset 173.1 109.2
Sub-total excluding separate account assets 68,467.9 70,095.2
Separate account assets 155,478.2 155,375.1
Total assets 223,946.1 225,470.3
Investment and universal life contracts (78.8) (46.4)
Market risk benefit liability (112.5) (207.4)
Funds withheld payable embedded derivative 4,045.7 3,652.8
Derivative liabilities (675.1) (634.2)
Other liabilities (1.3) (0.4)
Total liabilities 3,178.0 2,764.4
Net assets (liabilities) 227,124.1 228,234.7
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 77.6 81.4
Sub-total excluding separate account assets 77.6 81.4
Separate account assets 8,301.0 9,120.9
Total assets 8,378.6 9,202.3
Net assets (liabilities) 8,378.6 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 1,159.9 1,387.1
Fixed maturities, trading 65.4 78.6
Equity securities 569.1 492.4
Other investments 217.6 311.7
Cash equivalents 111.9 973.5
Sub-total excluding separate account assets 2,123.9 3,243.3
Separate account assets 95,974.0 92,010.7
Total assets 98,097.9 95,254.0
Net assets (liabilities) 98,097.9 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 57,207.9 59,336.2
Fixed maturities, trading 361.7 548.1
Equity securities 1,191.1 1,216.2
Derivative instruments, assets 278.4 320.9
Other investments 356.6 306.1
Cash equivalents 3,082.4 2,630.6
Sub-total excluding separate account assets 62,478.1 64,358.1
Separate account assets 50,438.7 53,208.6
Total assets 112,916.8 117,566.7
Derivative liabilities (657.1) (630.1)
Other liabilities (1.3) (0.4)
Total liabilities (658.4) (630.5)
Net assets (liabilities) 112,258.4 116,936.2
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,214.2 2,166.6
Fixed maturities, trading 295.1 134.0
Derivative instruments, assets 0.7 0.7
Other investments 105.2 1.9
Market risk benefit asset 173.1 109.2
Sub-total excluding separate account assets 3,788.3 2,412.4
Separate account assets 764.5 1,034.9
Total assets 4,552.8 3,447.3
Investment and universal life contracts (78.8) (46.4)
Market risk benefit liability (112.5) (207.4)
Funds withheld payable embedded derivative 4,045.7 3,652.8
Derivative liabilities (18.0) (4.1)
Total liabilities 3,836.4 3,394.9
Net assets (liabilities) 8,389.2 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 1,458.8 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 1,132.4 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 326.4 380.7
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 478.4 567.3
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 478.1 565.9
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,271.0 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 6,205.8 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 65.2 70.9
Recurring Fair Value Measurements | Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 33,669.9 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 27.2 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 31,610.8 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 2,031.9 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 2,683.7 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 2,683.7 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 4,659.6 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 4,656.5 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 3.1 3.4
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 5,133.8 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 5,076.1 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 57.7 56.2
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 7,226.8 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 6,170.5 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 $ 1,056.3 $ 467.8