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Collateralized Transactions - Contractual Maturity (Details) - USD ($)
$ in Millions
Aug. 31, 2025
Nov. 30, 2024
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements $ 2,498.0 $ 2,540.9
Repurchase Agreements 18,011.7 18,088.9
Obligation to Return Securities Received as Collateral, at Fair Value 54.2 185.6
Total 20,563.9 20,815.4
Overnight and Continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 1,788.8 1,617.8
Repurchase Agreements 2,083.7 2,258.1
Obligation to Return Securities Received as Collateral, at Fair Value 54.2 185.6
Total 3,926.7 4,061.5
Up to 30 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 70.8 154.3
Repurchase Agreements 8,998.9 7,055.1
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total 9,069.7 7,209.4
31-90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 135.7 250.4
Repurchase Agreements 3,485.2 4,182.8
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total 3,620.9 4,433.2
Greater than 90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 502.7 518.4
Repurchase Agreements 3,443.9 4,592.9
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total $ 3,946.6 $ 5,111.2