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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 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 $ 282.9 $ 271.6
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 117.0 164.7
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 282.9 271.6
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 83.1  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 383.7 156.8
Notional amount 55,894.5 50,787.9
Gross credit exposure 541.3 301.6
Less: collateral received 446.5 208.3
Net credit exposure 94.8 93.3
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 38,991.6 35,173.6
Gross credit exposure 351.7 181.9
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 1,886.9 1,416.9
Gross credit exposure 65.1 28.3
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 591.5 142.5
Swaptions    
Derivative Financial Instruments, exposure    
Notional amount 62.0 62.0
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,185.9 1,182.3
Gross credit exposure 10.9 4.9
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 986.0 1,027.2
Gross credit exposure 71.7 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 1,735.9 1,672.8
Gross credit exposure 39.3 30.5
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 379.9 149.5
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 310.0 165.0
Gross credit exposure 2.6 0.5
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 9,764.8 $ 9,742.3