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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Derivative Financial Instruments, exposure    
Cash and securities posted under collateral arrangements associated with derivative credit support agreements and Futures Commission Merchant agreements $ 544.2 $ 750.9
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 482.3 632.6
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 544.2 750.9
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 96.6  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 103.3 148.8
Notional amount 94,371.1 89,064.3
Gross credit exposure 314.3 331.2
Less: collateral received 148.7 191.9
Net credit exposure 165.6 139.3
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 57,792.2 52,249.9
Gross credit exposure 42.9 64.2
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 4,498.4 4,418.9
Gross credit exposure 37.0 41.7
Interest rate forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,990.8 2,527.5
Gross credit exposure 4.2 0.1
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 1,205.0 877.5
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 2,105.8 1,634.7
Gross credit exposure 120.9 171.1
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,062.5 1,123.1
Gross credit exposure 20.8 34.0
Equity options    
Derivative Financial Instruments, exposure    
Notional amount 2,331.3 2,049.3
Gross credit exposure 83.8 16.5
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 568.4 574.1
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 305.0 400.0
Gross credit exposure 4.7 3.6
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 22,511.7 $ 23,209.3