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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Derivative Financial Instruments, exposure    
Cash and securities posted under collateral arrangements associated with derivative credit support agreements and Futures Commission Merchant agreements $ 653.8 $ 240.8
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 504.9 146.3
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 653.8 240.8
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 78.7  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 145.6 214.9
Notional amount 91,762.2 69,428.1
Gross credit exposure 265.5 348.1
Less: collateral received 160.2 244.6
Net credit exposure 105.3 103.5
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 50,917.9 47,927.4
Gross credit exposure 83.2 205.9
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 2,845.9 2,373.9
Gross credit exposure 25.9 24.5
Interest rate forwards    
Derivative Financial Instruments, exposure    
Notional amount 2,891.1 2,181.6
Gross credit exposure 5.8 15.3
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 1,039.5 1,774.5
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 1,420.0 1,242.7
Gross credit exposure 106.2 51.1
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,063.8 1,043.6
Gross credit exposure 20.7 11.3
Equity options    
Derivative Financial Instruments, exposure    
Notional amount 2,319.1 2,378.2
Gross credit exposure 20.7 37.3
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 557.1 150.4
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 400.0 295.0
Gross credit exposure 3.0 2.7
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 28,307.8 $ 10,060.8