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Related Party Transactions - Jefferies (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2021
Feb. 28, 2021
Feb. 29, 2020
Nov. 30, 2020
Related Party Transaction [Line Items]        
Payables-brokers, dealers and clearing organizations   $ 4,098,406,000   $ 3,325,753,000
Financial instruments owned, at fair value   18,570,876,000   17,686,052,000
Total financial instruments sold, not yet purchased   12,361,542,000   10,017,522,000
Floor brokerage and clearing fees   76,580,000 $ 60,580,000  
Jefferies | Broker-dealer payable to customer        
Related Party Transaction [Line Items]        
Customer account payables   1,100,000   2,200,000
Corporate debt securities        
Related Party Transaction [Line Items]        
Total financial instruments sold, not yet purchased   1,826,029,000   1,237,772,000
Affiliated entity | Jefferies        
Related Party Transaction [Line Items]        
Charges to Jefferies for services provided   15,600,000 10,400,000  
Charges from Jefferies for services received   9,900,000 8,000,000.0  
Receivable from Jefferies   4,000,000.0   1,300,000
Payable to Jefferies   3,200,000   7,100,000
Contribution received   153,600,000    
Distribution payable   247,000,000.0    
Net current tax payable   244,200,000   111,100,000
Net gain (loss) on investments   0    
Securities purchased from Jefferies   9,100,000 26,100,000  
Securities sold to Jefferies   500,000 0  
Payables-brokers, dealers and clearing organizations   100,000   2,700,000
Affiliated entity | Affiliate of Jefferies Financial Group Inc.        
Related Party Transaction [Line Items]        
Financial instruments owned, at fair value       100,000
Payments for rent and other expenses   200,000 200,000  
Affiliated entity | Hedge Fund Managed by Jefferies        
Related Party Transaction [Line Items]        
Net gain (loss) on investments   3,800,000    
Investment in related party       239,000,000.0
Payment received   2,200,000    
Affiliated entity | Subsidiary of Jefferies Financial Group Inc.        
Related Party Transaction [Line Items]        
Net gains (losses) on foreign exchange contracts   100,000 (600,000)  
Affiliated entity | Subsequent event | Jefferies        
Related Party Transaction [Line Items]        
Payments of payable to Jefferies $ 175,000,000.0      
Affiliated entity | Corporate debt securities | Jefferies        
Related Party Transaction [Line Items]        
Financial instruments owned, at fair value   200,000   2,600,000
Total financial instruments sold, not yet purchased   100,000    
Floor brokerage and clearing fees   500,000    
Affiliated entity | Director        
Related Party Transaction [Line Items]        
Investment in related party       $ 800,000
Affiliated entity | Investment banking | Jefferies        
Related Party Transaction [Line Items]        
Charges to Jefferies for services provided   13,600,000 0  
Affiliated entity | Commissions and other fees | Jefferies        
Related Party Transaction [Line Items]        
Charges to Jefferies for services provided   300,000 $ 300,000  
Affiliated entity | Distribution based on earnings | Jefferies        
Related Party Transaction [Line Items]        
Payments of distributions to affiliates   153,600,000    
Affiliated entity | Additional distribution | Jefferies        
Related Party Transaction [Line Items]        
Payments of distributions to affiliates   $ 153,600,000