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Current Expected Credit Losses - Changes in CECL Allowance Reserve (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance | $ 14,900,000 | $ 2,400,000 | $ 2,600,000
Current-period provision for expected credit losses | 11,300,000 | 12,500,000 | (200,000)
Ending balance | 26,200,000 | 14,900,000 | 2,400,000
Accrued commissions and other receivables, net |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance | 5,400,000 | 700,000 | 1,000,000.0
Current-period provision for expected credit losses | (400,000) | 4,700,000 | (300,000)
Ending balance | 5,000,000.0 | 5,400,000 | 700,000
Loans, forgivable loans and other receivables from employees and partners, net |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance | 2,500,000 | 1,700,000 | 1,600,000
Current-period provision for expected credit losses | (200,000) | 800,000 | 100,000
Ending balance | 2,300,000 | 2,500,000 | 1,700,000
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance | 7,000,000.0 | 0 | 0
Current-period provision for expected credit losses | 11,900,000 | 7,000,000.0 | 0
Ending balance | $ 18,900,000 | $ 7,000,000.0 | $ 0

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