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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 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 $ 137.7 $ 148.3
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 166.6 180.2
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 137.7 148.3
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 36.4  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 157.3 225.2
Notional amount 63,190.1 62,292.5
Gross credit exposure 351.3 473.5
Less: collateral received 241.7 294.7
Net credit exposure 109.6 178.8
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 44,597.9 44,472.1
Gross credit exposure 186.6 291.0
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 2,373.9 2,083.9
Gross credit exposure 40.9 51.0
Interest rate forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,000.0 1,000.0
Gross credit exposure   6.2
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 705.5 188.5
Swaptions    
Derivative Financial Instruments, exposure    
Notional amount   62.0
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,137.7 1,115.8
Gross credit exposure 45.8 45.4
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 1,077.4 1,045.5
Gross credit exposure 41.6 43.3
Equity options    
Derivative Financial Instruments, exposure    
Notional amount 1,889.7 1,857.8
Gross credit exposure 33.3 33.2
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 122.1 218.1
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 315.0 295.0
Gross credit exposure 3.1 3.4
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 9,970.9 $ 9,953.8