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Collateralized Transactions - Contractual Maturity (Details) - USD ($)
$ in Millions
Feb. 28, 2026
Nov. 30, 2025
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements $ 2,690.4 $ 2,540.8
Repurchase Agreements 15,831.0 18,261.2
Obligation to Return Securities Received as Collateral, at Fair Value 393.9 200.5
Total 18,915.3 21,002.5
Overnight and Continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 2,252.7 2,072.7
Repurchase Agreements 1,719.2 2,108.1
Obligation to Return Securities Received as Collateral, at Fair Value 393.9 200.5
Total 4,365.8 4,381.3
Up to 30 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 89.0 123.8
Repurchase Agreements 7,290.3 9,569.4
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total 7,379.3 9,693.2
31-90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 150.7 81.3
Repurchase Agreements 3,104.3 2,959.8
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total 3,255.0 3,041.1
Greater than 90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 198.0 263.0
Repurchase Agreements 3,717.2 3,623.9
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total $ 3,915.2 $ 3,886.9