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Current Expected Credit Losses (CECL) - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | $ 27,700,000 | $ 18,500,000 | $ 26,200,000 | $ 14,900,000
Current-period provision for expected credit losses | (100,000) | 1,600,000 | 3,700,000 | 5,200,000
Release of allowance for expected credit losses |  |  | (2,300,000) |
Ending balance | 27,600,000 | 20,100,000 | 27,600,000 | 20,100,000
Accrued commissions and other receivables, net |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | 6,000,000.0 | 5,100,000 | 5,000,000.0 | 5,400,000
Current-period provision for expected credit losses | 100,000 | (200,000) | 1,100,000 | (500,000)
Release of allowance for expected credit losses |  |  | 0 |
Ending balance | 6,100,000 | 4,900,000 | 6,100,000 | 4,900,000
Loans, forgivable loans and other receivables from employees and partners, net |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | 0 | 2,400,000 | 2,300,000 | 2,500,000
Current-period provision for expected credit losses | 0 | (200,000) | 0 | (300,000)
Release of allowance for expected credit losses | 0 |  | (2,300,000) |
Ending balance | 0 | 2,200,000 | 0 | 2,200,000
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | 21,700,000 | 11,000,000.0 | 18,900,000 | 7,000,000.0
Current-period provision for expected credit losses | (200,000) |  | 2,600,000 | 6,000,000.0
Release of allowance for expected credit losses |  |  | 0 |
Ending balance |  | 13,000,000.0 |  | $ 13,000,000.0
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers | Russia/Ukraine Conflit |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Current-period provision for expected credit losses |  | $ 2,000,000.0 |  |
Ending balance | $ 21,500,000 |  | $ 21,500,000 |

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