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Collateralized Transactions - Contractual Maturity (Details) - USD ($)
$ in Millions
May 31, 2025
Nov. 30, 2024
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements $ 2,041.8 $ 2,540.9
Repurchase Agreements 20,545.0 18,088.9
Obligation to Return Securities Received as Collateral, at Fair Value 51.0 185.6
Total 22,637.8 20,815.4
Overnight and Continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 1,474.5 1,617.8
Repurchase Agreements 2,431.4 2,258.1
Obligation to Return Securities Received as Collateral, at Fair Value 51.0 185.6
Total 3,956.9 4,061.5
Up to 30 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 76.1 154.3
Repurchase Agreements 10,216.6 7,055.1
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total 10,292.7 7,209.4
31-90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 195.0 250.4
Repurchase Agreements 3,879.2 4,182.8
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total 4,074.2 4,433.2
Greater than 90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 296.2 518.4
Repurchase Agreements 4,017.8 4,592.9
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total $ 4,314.0 $ 5,111.2