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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 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 $ 290.9 $ 271.6
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 102.3 164.7
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 290.9 271.6
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 78.8  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 473.5 156.8
Notional amount 54,266.9 50,868.2
Gross credit exposure 629.0 301.6
Less: collateral received 536.0 208.3
Net credit exposure 93.0 93.3
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 37,078.6 35,173.6
Gross credit exposure 355.3 181.9
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 1,886.9 1,416.9
Gross credit exposure 63.8 28.3
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 539.0 142.5
Swaptions    
Derivative Financial Instruments, exposure    
Notional amount 62.0 62.0
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,257.6 1,262.6
Gross credit exposure 36.4 4.9
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 1,005.1 1,027.2
Gross credit exposure 89.7 55.4
Currency options    
Derivative Financial Instruments, exposure    
Notional amount 95.2 53.8
Gross credit exposure 7.4 0.1
Equity options    
Derivative Financial Instruments, exposure    
Notional amount 1,742.0 1,672.8
Gross credit exposure 74.7 30.5
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 667.8 149.5
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 160.0 165.0
Gross credit exposure 1.7 0.5
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 9,772.7 $ 9,742.3