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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Derivative Financial Instruments, exposure    
Cash and securities posted under collateral arrangements associated with derivative credit support agreements and Futures Commission Merchant agreements $ 105.2 $ 148.3
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 170.0 180.2
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 105.2 148.3
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 23.6  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 177.5 225.2
Notional amount 62,309.3 62,292.5
Gross credit exposure 377.7 473.5
Less: collateral received 253.7 294.7
Net credit exposure 124.0 178.8
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 44,169.9 44,472.1
Gross credit exposure 223.0 291.0
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 2,373.9 2,083.9
Gross credit exposure 36.5 51.0
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 741.5 188.5
Interest rate forwards    
Derivative Financial Instruments, exposure    
Notional amount   1,000.0
Gross credit exposure   6.2
Swaptions    
Derivative Financial Instruments, exposure    
Notional amount   62.0
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 1,180.8 1,045.5
Gross credit exposure 43.2 43.3
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 858.8 1,115.8
Gross credit exposure 34.8 45.4
Currency options    
Derivative Financial Instruments, exposure    
Notional amount 423.3  
Gross credit exposure 1.5  
Equity options    
Derivative Financial Instruments, exposure    
Notional amount 2,024.4 1,857.8
Gross credit exposure 35.5 33.2
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 114.0 218.1
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 315.0 295.0
Gross credit exposure 3.2 3.4
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 10,107.7 $ 9,953.8