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Derivative Financial Instruments - Fair Value of Derivatives (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Derivatives, fair value disclosures    
Derivative instruments, assets $ 610.8 $ 648.2
Derivative instruments, liabilities (1,844.7) (1,929.9)
Fair value of embedded derivative liabilities reported with contractholder funds 522.7 578.4
Fair value of net (asset) liability embedded derivative reported with funds withheld payable (2,804.8) (3,014.5)
Derivatives designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 175.8 170.4
Derivative instruments, liabilities 103.0 103.7
Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 435.0 477.8
Derivative instruments, liabilities (1,947.7) (2,033.6)
Interest rate contracts | Derivatives designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, liabilities 79.1 83.0
Interest rate contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 31.1 35.4
Derivative instruments, liabilities 161.1 246.9
Foreign exchange contracts | Derivatives designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 175.8 170.4
Derivative instruments, liabilities 23.9 20.7
Foreign exchange contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 31.5 20.0
Derivative instruments, liabilities 19.3 34.8
Equity contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 368.1 405.0
Derivative instruments, liabilities 136.0 119.8
Credit contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 4.3 17.4
Derivative instruments, liabilities 18.0 1.0
Other contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, liabilities $ (2,282.1) $ (2,436.1)