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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Derivative Financial Instruments, exposure    
Cash and securities posted under collateral arrangements associated with derivative credit support agreements and Futures Commission Merchant agreements $ 443.5 $ 544.2
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 457.4 482.3
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 443.5 544.2
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 69.3  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 254.2 103.3
Notional amount 95,560.2 94,371.1
Gross credit exposure 433.1 314.3
Less: collateral received 294.3 148.7
Net credit exposure 138.8 165.6
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 59,411.6 57,792.2
Gross credit exposure 21.6 42.9
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 4,420.7 4,498.4
Gross credit exposure 31.0 37.0
Interest rate forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,739.2 1,990.8
Gross credit exposure 1.3 4.2
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 810.0 1,205.0
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 2,509.2 2,105.8
Gross credit exposure 176.7 120.9
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,040.4 1,062.5
Gross credit exposure 17.6 20.8
Equity options    
Derivative Financial Instruments, exposure    
Notional amount 2,907.3 2,331.3
Gross credit exposure 180.2 83.8
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 598.0 568.4
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 305.0 305.0
Gross credit exposure 4.7 4.7
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 21,818.8 $ 22,511.7