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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 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 $ 240.8 $ 148.3
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 146.3 180.2
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 240.8 148.3
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 48.6  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 214.9 225.2
Notional amount 69,428.1 62,292.5
Gross credit exposure 348.1 473.5
Less: collateral received 244.6 294.7
Net credit exposure 103.5 178.8
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 47,927.4 44,472.1
Gross credit exposure 205.9 291.0
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 2,373.9 2,083.9
Gross credit exposure 24.5 51.0
Interest rate forwards    
Derivative Financial Instruments, exposure    
Notional amount 2,181.6 1,000.0
Gross credit exposure 15.3 6.2
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 1,774.5 188.5
Swaptions    
Derivative Financial Instruments, exposure    
Notional amount   62.0
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 1,242.7 1,045.5
Gross credit exposure 51.1 43.3
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,043.6 1,115.8
Gross credit exposure 11.3 45.4
Equity options    
Derivative Financial Instruments, exposure    
Notional amount 2,378.2 1,857.8
Gross credit exposure 37.3 33.2
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 150.4 218.1
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 295.0 295.0
Gross credit exposure 2.7 3.4
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 10,060.8 $ 9,953.8