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Commitments, Contingencies and Guarantees - Narrative (Details) $ in Millions	3 Months Ended
	Feb. 28, 2026 USD ($)
Loss Contingencies [Line Items]
Fair value of derivative contracts approximated deemed to meet the definition of a guarantee	$ (635.0)
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	$ 74.4
Outstanding Loan Commitments to Clients
Loss Contingencies [Line Items]
Loan commitments outstanding to clients	319.2
Outstanding Loan Commitments to Strategic Affiliates
Loss Contingencies [Line Items]
Loan commitments outstanding to clients	3.4
Jefferies Capital Partners LLC
Loss Contingencies [Line Items]
Outstanding equity commitments	9.7
Strategic Affiliates
Loss Contingencies [Line Items]
Outstanding equity commitments	192.9
Other Investments
Loss Contingencies [Line Items]
Outstanding equity commitments	$ 35.7

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