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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 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 $ 148.3 $ 271.6
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 180.2 164.7
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 148.3 271.6
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 44.4  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 225.2 156.8
Notional amount 62,292.5 50,787.9
Gross credit exposure 473.5 301.6
Less: collateral received 294.7 208.3
Net credit exposure 178.8 93.3
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 44,472.1 35,173.6
Gross credit exposure 291.0 181.9
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 2,083.9 1,416.9
Gross credit exposure 51.0 28.3
Interest rate forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,000.0  
Gross credit exposure 6.2  
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 188.5 142.5
Swaptions    
Derivative Financial Instruments, exposure    
Notional amount 62.0 62.0
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,115.8 1,182.3
Gross credit exposure 45.4 4.9
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 1,045.5 1,027.2
Gross credit exposure 43.3 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 1,857.8 1,672.8
Gross credit exposure 33.2 30.5
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 218.1 149.5
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 295.0 165.0
Gross credit exposure 3.4 0.5
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 9,953.8 $ 9,742.3