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Derivative Financial Instruments - Fair Value of Derivatives (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Derivatives, fair value disclosures    
Derivative instruments, assets $ 373.0 $ 337.1
Derivative instruments, liabilities (3,562.6) 582.3
Fair value of embedded derivative liabilities reported with contractholder funds 25.9 356.3
Fair value of net (asset) liability embedded derivative reported with funds withheld payable (4,305.0)  
Derivatives designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 238.4 52.5
Derivative instruments, liabilities 122.2 36.6
Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 134.6 284.6
Derivative instruments, liabilities (3,684.8) 545.7
Interest rate contracts | Derivatives designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 21.0 4.1
Derivative instruments, liabilities 120.2 19.0
Interest rate contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 81.1 233.4
Derivative instruments, liabilities 486.3 13.0
Foreign exchange contracts | Derivatives designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 217.4 48.4
Derivative instruments, liabilities 2.0 17.6
Foreign exchange contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 24.7 11.3
Derivative instruments, liabilities 67.2 83.3
Equity contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 25.8 37.3
Derivative instruments, liabilities 36.9 90.9
Credit contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, assets 3.0 2.6
Derivative instruments, liabilities 3.9 2.2
Other contracts | Derivatives not designated as hedging instruments    
Derivatives, fair value disclosures    
Derivative instruments, liabilities $ (4,279.1) $ 356.3