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Commitments, Contingencies and Guarantees - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2017
Loss Contingencies [Line Items]      
Loan commitments outstanding to clients $ 64.3    
Future minimum rentals due from non-cancelable sublease 16.2    
Rental expense, net 61.2 $ 52.3 $ 56.1
Fair value of derivative contracts approximated deemed to meet the definition of a guarantee 170.9    
Standby Letters of Credit      
Loss Contingencies [Line Items]      
Letters of credit commitments $ 36.9    
Letters of credit commitments expiration period 1 year    
Jefferies Capital Partners LLC      
Loss Contingencies [Line Items]      
Outstanding equity commitments $ 11.5    
Other Investments      
Loss Contingencies [Line Items]      
Outstanding equity commitments $ 7.8