v3.26.3
Collateralized Transactions - Collateral Pledged (Details) - USD ($)
$ in Millions
Aug. 31, 2026
Nov. 30, 2025
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements $ 4,023.0 $ 2,540.8
Repurchase Agreements 19,066.6 18,261.2
Obligation to Return Securities Received as Collateral, at Fair Value 289.9 200.5
Total 23,379.5 21,002.5
Corporate equity securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 3,214.2 1,875.2
Repurchase Agreements 2,493.3 1,028.6
Obligation to Return Securities Received as Collateral, at Fair Value 56.0 0.0
Total 5,763.5 2,903.8
Corporate debt securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 323.7 589.7
Repurchase Agreements 3,428.4 3,271.5
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total 3,752.1 3,861.2
Mortgage-backed and asset-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 397.2 0.0
Repurchase Agreements 2,128.9 2,062.6
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total 2,526.1 2,062.6
U.S. government and federal agency securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 63.4 21.6
Repurchase Agreements 8,232.7 9,183.1
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total 8,296.1 9,204.7
Municipal securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 0.0 0.0
Repurchase Agreements 565.5 422.3
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total 565.5 422.3
Sovereign obligations    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 24.5 54.3
Repurchase Agreements 1,638.3 1,487.7
Obligation to Return Securities Received as Collateral, at Fair Value 233.9 200.5
Total 1,896.7 1,742.5
Loans and other receivables    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 0.0 0.0
Repurchase Agreements 579.5 805.4
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total $ 579.5 $ 805.4