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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Derivative Financial Instruments, exposure    
Cash and securities posted under collateral arrangements associated with derivative credit support agreements and Futures Commission Merchant agreements $ 750.9 $ 240.8
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 632.6 146.3
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 750.9 240.8
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 89.6  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 148.8 214.9
Notional amount 96,926.2 69,428.1
Gross credit exposure 331.2 348.1
Less: collateral received 191.9 244.6
Net credit exposure 139.3 103.5
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 52,249.9 47,927.4
Gross credit exposure 64.2 205.9
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 4,418.9 2,373.9
Gross credit exposure 41.7 24.5
Interest rate forwards    
Derivative Financial Instruments, exposure    
Notional amount 2,527.5 2,181.6
Gross credit exposure 0.1 15.3
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 877.5 1,774.5
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 1,634.7 1,242.7
Gross credit exposure 171.1 51.1
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,123.1 1,043.6
Gross credit exposure 34.0 11.3
Equity options    
Derivative Financial Instruments, exposure    
Notional amount 2,049.3 2,378.2
Gross credit exposure 16.5 37.3
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 574.1 150.4
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 400.0 295.0
Gross credit exposure 3.6 2.7
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 31,071.2 $ 10,060.8