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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Derivative Financial Instruments, exposure    
Cash and securities posted under collateral arrangements associated with derivative credit support agreements and Futures Commission Merchant agreements $ 170.1 $ 106.6
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 143.9 109.7
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 170.1 106.6
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 32.4  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 115.5 79.5
Notional amount 49,669.4 49,954.5
Gross credit exposure 297.4 197.7
Less: collateral received 200.0 122.9
Net credit exposure 97.4 74.8
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 34,178.3 34,393.7
Gross credit exposure 174.3 95.4
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 1,126.9 1,126.9
Gross credit exposure 29.5 16.3
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 270.0 260.0
Swaptions    
Derivative Financial Instruments, exposure    
Notional amount 62.0  
Gross credit exposure 0.1  
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 915.1 863.6
Gross credit exposure 1.3 2.8
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 903.8 898.6
Gross credit exposure 68.5 71.2
Currency options    
Derivative Financial Instruments, exposure    
Notional amount 469.2 525.2
Gross credit exposure 0.5 1.9
Equity options    
Derivative Financial Instruments, exposure    
Notional amount 1,581.5 1,522.5
Gross credit exposure 22.2 7.7
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 316.1 491.7
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 370.0 420.0
Gross credit exposure 1.0 2.4
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 9,476.5 $ 9,452.3