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Derivative Financial Instruments - Fair Value of Derivatives (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Derivatives, fair value disclosures    
Derivative instruments, assets $ 253.0 $ 256.6
Derivative instruments, liabilities (1,737.2) (2,994.3)
Fair value of embedded derivative liabilities reported with contractholder funds 115.5 46.3
Fair value of net (asset) liability embedded derivative reported with funds withheld payable (2,326.1) (3,652.8)
Derivatives designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 93.6 154.6
Derivative instruments, liabilities 111.5 124.4
Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 159.4 102.0
Derivative instruments, liabilities (1,848.7) (3,118.7)
Interest rate contracts | Derivatives designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 9.0 20.0
Derivative instruments, liabilities 72.6 105.1
Interest rate contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 70.3 81.1
Derivative instruments, liabilities 284.3 439.9
Foreign exchange contracts | Derivatives designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 84.6 134.6
Derivative instruments, liabilities 38.9 19.3
Foreign exchange contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 0.7 0.9
Derivative instruments, liabilities 2.3 0.3
Equity contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 83.8 16.5
Derivative instruments, liabilities 74.2 45.6
Credit contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 4.6 3.5
Derivative instruments, liabilities 1.1 2.0
Other contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, liabilities $ (2,210.6) $ (3,606.5)