Commitments, Contingencies and Guarantees - Additional Information (Details) $ in Millions	6 Months Ended
	May 31, 2022 USD ($)
Loss Contingencies [Line Items]
Fair value of derivative contracts approximated deemed to meet the definition of a guarantee	$ 600.7
Standby letters of credit
Loss Contingencies [Line Items]
Letters of credit commitments	$ 7.6
Standby letters of credit | Maximum
Loss Contingencies [Line Items]
Standby letters of credit expiration period	1 year
Outstanding loan commitments to clients
Loss Contingencies [Line Items]
Loan commitments outstanding to clients	$ 91.6
Jefferies Capital Partners LLC
Loss Contingencies [Line Items]
Outstanding equity commitments	10.7
Oak Hill
Loss Contingencies [Line Items]
Outstanding equity commitments	70.8
Strategic Affiliates
Loss Contingencies [Line Items]
Outstanding equity commitments	350.0
Other Investments
Loss Contingencies [Line Items]
Outstanding equity commitments	$ 46.8