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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Derivative Financial Instruments, exposure    
Cash and securities posted under collateral arrangements associated with derivative credit support agreements and Futures Commission Merchant agreements $ 756.9 $ 750.9
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 654.0 632.6
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 756.9 750.9
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 75.7  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 129.1 148.8
Notional amount 91,059.3 89,064.3
Gross credit exposure 288.0 331.2
Less: collateral received 165.1 191.9
Net credit exposure 122.9 139.3
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 55,478.2 52,249.9
Gross credit exposure 38.3 64.2
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 3,016.9 4,418.9
Gross credit exposure 34.2 41.7
Interest rate forwards    
Derivative Financial Instruments, exposure    
Notional amount 2,172.6 2,527.5
Gross credit exposure   0.1
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 1,707.2 877.5
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 1,757.3 1,634.7
Gross credit exposure 146.0 171.1
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,016.7 1,123.1
Gross credit exposure 20.1 34.0
Equity options    
Derivative Financial Instruments, exposure    
Notional amount 2,254.8 2,049.3
Gross credit exposure 45.4 16.5
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 573.8 574.1
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 305.0 400.0
Gross credit exposure 4.0 3.6
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 22,776.8 $ 23,209.3