v3.26.1
Collateralized Transactions - Collateral Pledged (Details) - USD ($)
$ in Millions
May 31, 2026
Nov. 30, 2025
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements $ 3,104.6 $ 2,540.8
Repurchase Agreements 18,500.0 18,261.2
Obligation to Return Securities Received as Collateral, at Fair Value 310.8 200.5
Total 21,915.4 21,002.5
Corporate equity securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 2,573.1 1,875.2
Repurchase Agreements 1,774.8 1,028.6
Obligation to Return Securities Received as Collateral, at Fair Value 80.3 0.0
Total 4,428.2 2,903.8
Corporate debt securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 311.8 589.7
Repurchase Agreements 3,428.5 3,271.5
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total 3,740.3 3,861.2
Mortgage-backed and asset-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 186.3 0.0
Repurchase Agreements 2,114.6 2,062.6
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total 2,300.9 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 14.4 21.6
Repurchase Agreements 8,435.1 9,183.1
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total 8,449.5 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 430.9 422.3
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total 430.9 422.3
Sovereign obligations    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending Arrangements 19.0 54.3
Repurchase Agreements 1,529.5 1,487.7
Obligation to Return Securities Received as Collateral, at Fair Value 230.5 200.5
Total 1,779.0 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 786.6 805.4
Obligation to Return Securities Received as Collateral, at Fair Value 0.0 0.0
Total $ 786.6 $ 805.4