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Derivative Financial Instruments - Fair Value of Derivatives (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Derivatives, fair value disclosures    
Derivative instruments, assets $ 279.1 $ 321.6
Derivative instruments, liabilities (3,291.8) (2,972.2)
Fair value of embedded derivative liabilities reported with contractholder funds 78.8 46.4
Fair value of net (asset) liability embedded derivative reported with funds withheld payable (4,045.7) (3,652.8)
Derivatives designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 133.0 154.6
Derivative instruments, liabilities 119.7 124.8
Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 146.1 167.0
Derivative instruments, liabilities (3,411.5) (3,097.0)
Interest rate contracts | Derivatives designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 12.5 20.0
Derivative instruments, liabilities 104.3 105.1
Interest rate contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 55.0 81.1
Derivative instruments, liabilities 471.1 439.9
Foreign exchange contracts | Derivatives designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 120.5 134.6
Derivative instruments, liabilities 15.4 19.7
Foreign exchange contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 41.8 65.9
Derivative instruments, liabilities 18.3 21.9
Equity contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 45.4 16.5
Derivative instruments, liabilities 64.7 45.6
Credit contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 3.9 3.5
Derivative instruments, liabilities 1.3 2.0
Other contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, liabilities $ (3,966.9) $ (3,606.4)