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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 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 $ 599.8 $ 750.9
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 528.7 632.6
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 599.8 750.9
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 84.1  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 132.8 148.8
Notional amount 126,582.4 89,064.3
Gross credit exposure 371.3 331.2
Less: collateral received 229.3 191.9
Net credit exposure 142.0 139.3
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 90,672.4 52,249.9
Gross credit exposure 52.8 64.2
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 3,049.0 4,418.9
Gross credit exposure 31.1 41.7
Interest rate forwards    
Derivative Financial Instruments, exposure    
Notional amount 2,428.9 2,527.5
Gross credit exposure 6.4 0.1
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 1,670.3 877.5
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 1,703.6 1,634.7
Gross credit exposure 180.1 171.1
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,020.0 1,123.1
Gross credit exposure 58.6 34.0
Equity options    
Derivative Financial Instruments, exposure    
Notional amount 2,112.8 2,049.3
Gross credit exposure 38.3 16.5
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 676.7 574.1
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 $ 22,943.7 $ 23,209.3