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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 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 $ 674.0 $ 750.9
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 504.3 632.6
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 674.0 750.9
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 94.1  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 136.5 148.8
Notional amount 90,213.3 89,064.3
Gross credit exposure 395.9 331.2
Less: collateral received 219.0 191.9
Net credit exposure 176.9 139.3
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 54,333.8 52,249.9
Gross credit exposure 68.3 64.2
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 3,049.0 4,418.9
Gross credit exposure 32.3 41.7
Interest rate forwards    
Derivative Financial Instruments, exposure    
Notional amount 2,370.7 2,527.5
Gross credit exposure 5.4 0.1
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 960.5 877.5
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 1,617.9 1,634.7
Gross credit exposure 190.8 171.1
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,585.3 1,123.1
Gross credit exposure 70.8 34.0
Equity options    
Derivative Financial Instruments, exposure    
Notional amount 1,999.1 2,049.3
Gross credit exposure 24.6 16.5
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 732.7 574.1
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 400.0 400.0
Gross credit exposure 3.7 3.6
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 23,164.3 $ 23,209.3