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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Derivative Financial Instruments, exposure    
Cash and securities posted under collateral arrangements associated with derivative credit support agreements and Futures Commission Merchant agreements $ 154.6 $ 271.6
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 120.9 164.7
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 154.6 271.6
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 48.8  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 315.3 156.8
Notional amount 60,516.8 50,787.9
Gross credit exposure 488.6 301.6
Less: collateral received 379.7 208.3
Net credit exposure 108.9 93.3
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 43,937.1 35,173.6
Gross credit exposure 331.8 181.9
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 1,886.9 1,416.9
Gross credit exposure 58.2 28.3
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 253.0 142.5
Swaptions    
Derivative Financial Instruments, exposure    
Notional amount 62.0 62.0
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,182.5 1,182.3
Gross credit exposure 9.1 4.9
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 1,007.7 1,027.2
Gross credit exposure 51.6 55.4
Currency options    
Derivative Financial Instruments, exposure    
Notional amount   53.8
Gross credit exposure   0.1
Equity options    
Derivative Financial Instruments, exposure    
Notional amount 1,828.5 1,672.8
Gross credit exposure 34.9 30.5
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 184.3 149.5
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 310.0 165.0
Gross credit exposure 3.0 0.5
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 9,864.8 $ 9,742.3