Commitments, Contingencies and Guarantees - Additional Information (Details) $ in Millions	3 Months Ended
	Feb. 28, 2022 USD ($)
Loss Contingencies [Line Items]
Fair value of derivative contracts approximated deemed to meet the definition of a guarantee	$ 398.1
Standby letters of credit
Loss Contingencies [Line Items]
Letters of credit commitments	$ 6.1
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	$ 85.3
Jefferies Capital Partners LLC
Loss Contingencies [Line Items]
Outstanding equity commitments	10.7
Oak Hill
Loss Contingencies [Line Items]
Outstanding equity commitments	71.8
Other Investments
Loss Contingencies [Line Items]
Outstanding equity commitments	$ 56.2