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Current Expected Credit Losses (CECL) - Schedule of Current Expected Credit Losses (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ 16,800,000 $ 9,200,000 $ 14,900,000 $ 2,400,000
Current-period provision for expected credit losses 1,700,000 5,800,000 3,600,000 12,600,000
Ending balance 18,500,000 15,000,000.0 18,500,000 15,000,000.0
Accrued commissions and other receivables, net        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 5,400,000 1,600,000 5,400,000 700,000
Current-period provision for expected credit losses (300,000) 3,200,000 (300,000) 4,100,000
Ending balance 5,100,000 4,800,000 5,100,000 4,800,000
Loans, forgivable loans and other receivables from employees and partners, net        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 2,400,000 2,100,000 2,500,000 1,700,000
Current-period provision for expected credit losses 0 1,200,000 (100,000) 1,600,000
Ending balance 2,400,000 3,300,000 2,400,000 3,300,000
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 9,000,000.0 5,500,000 7,000,000.0 0
Current-period provision for expected credit losses 2,000,000.0 1,400,000 4,000,000.0 6,900,000
Ending balance $ 11,000,000.0 $ 6,900,000 $ 11,000,000.0 $ 6,900,000