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Commitments, Contingencies and Guarantees - Narrative (Details) $ in Millions | 9 Months Ended
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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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