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Commitments, Contingencies and Guarantees - Narrative (Details) $ in Millions	9 Months Ended
	Aug. 31, 2025 USD ($)
Loss Contingencies [Line Items]
Fair value of derivative contracts approximated deemed to meet the definition of a guarantee	$ (382.4)
Standby Letters of Credit
Loss Contingencies [Line Items]
Letters of credit commitments	$ 345.6
Standby Letters of Credit | Maximum
Loss Contingencies [Line Items]
Letters of credit commitments expiration period	1 year
HomeFed LLC
Loss Contingencies [Line Items]
Aggregate amount of infrastructure improvement bonds, outstanding	$ 68.2
Outstanding Loan Commitments to Clients
Loss Contingencies [Line Items]
Loan commitments outstanding to clients	99.4
Outstanding Loan Commitments to Strategic Affiliates
Loss Contingencies [Line Items]
Loan commitments outstanding to clients	9.6
Jefferies Capital Partners LLC
Loss Contingencies [Line Items]
Outstanding equity commitments	9.8
Strategic Affiliates
Loss Contingencies [Line Items]
Outstanding equity commitments	232.1
Other Investments
Loss Contingencies [Line Items]
Outstanding equity commitments	$ 40.7

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