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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 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 $ 232.3 $ 148.3
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 165.9 180.2
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 232.3 148.3
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 57.8  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 176.9 225.2
Notional amount 65,182.1 62,292.5
Gross credit exposure 341.1 473.5
Less: collateral received 217.9 294.7
Net credit exposure 123.2 178.8
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 44,028.9 44,472.1
Gross credit exposure 215.1 291.0
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 2,373.9 2,083.9
Gross credit exposure 31.9 51.0
Interest rate forwards    
Derivative Financial Instruments, exposure    
Notional amount 2,181.6 1,000.0
Gross credit exposure   6.2
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 1,585.0 188.5
Swaptions    
Derivative Financial Instruments, exposure    
Notional amount   62.0
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 1,152.6 1,045.5
Gross credit exposure 46.0 43.3
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,006.7 1,115.8
Gross credit exposure 8.9 45.4
Equity options    
Derivative Financial Instruments, exposure    
Notional amount 2,284.4 1,857.8
Gross credit exposure 36.2 33.2
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 117.4 218.1
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 310.0 295.0
Gross credit exposure 3.0 3.4
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 10,141.6 $ 9,953.8