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Current Expected Credit Losses (CECL) - Schedule of Current Expected Credit Losses (Details) - USD ($)
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ 26,200,000 $ 14,900,000
Current-period provision for expected credit losses 1,500,000 1,900,000
Ending balance 27,700,000 16,800,000
Accrued commissions and other receivables, net    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 5,000,000.0 5,400,000
Current-period provision for expected credit losses 900,000 0
Ending balance 5,900,000 5,400,000
Loans, forgivable loans and other receivables from employees and partners, net    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 2,300,000 2,500,000
Current-period provision for expected credit losses 0 (100,000)
Ending balance 2,300,000 2,400,000
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ 18,900,000 7,000,000.0
Ending balance   $ 9,000,000.0