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Current Expected Credit Losses (CECL) (Tables) | 9 Months Ended
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Sep. 30, 2025
Credit Loss [Abstract] |
Schedule of Current Expected Credit Losses | During the three and nine months ended September 30, 2025 and 2024, the Company recorded changes in the allowance for credit losses as follows (in millions):
| Accrued commissions and other receivables, net |  | Loans, forgivable loans and other receivables from employees and partners, net |  | Receivables from broker-dealers, clearing organizations, customers and related broker-dealers |  | Total
Beginning balance, July 1, 2025 | $ | 7.1 |  |  | $ | — |  |  | $ | 18.1 |  |  | $ | 25.2 |
Current-period provision for expected credit losses | — |  |  | — |  |  | (0.4) |  |  | (0.4) |
Ending balance, September 30, 2025 | $ | 7.1 |  |  | $ | — |  |  | $ | 17.7 |  |  | $ | 24.8 |
| Accrued commissions and other receivables, net |  | Loans, forgivable loans and other receivables from employees and partners, net |  | Receivables from broker-dealers, clearing organizations, customers and related broker-dealers |  | Total
Beginning balance, January 1, 2025 | $ | 6.2 |  |  | $ | — |  |  | $ | 21.0 |  |  | $ | 27.2 |
Current-period provision for expected credit losses | 0.9 |  |  | — |  |  | 0.7 |  |  | 1.6 |
Release of allowance for expected credit losses | — |  |  | — |  |  | (4.0) |  |  | (4.0) |
Ending balance, September 30, 2025 | $ | 7.1 |  |  | $ | — |  |  | $ | 17.7 |  |  | $ | 24.8 |
| Accrued commissions and other receivables, net |  | Loans, forgivable loans and other receivables from employees and partners, net |  | Receivables from broker-dealers, clearing organizations, customers and related broker-dealers |  | Total
Beginning balance, July 1, 2024 | $ | 6.0 |  |  | $ | — |  |  | $ | 21.7 |  |  | $ | 27.7 |
Current-period provision for expected credit losses | 0.1 |  |  | — |  |  | (0.2) |  |  | (0.1) |
Ending balance, September 30, 2024 | $ | 6.1 |  |  | $ | — |  |  | $ | 21.5 |  |  | $ | 27.6 |
| Accrued commissions and other receivables, net |  | Loans, forgivable loans and other receivables from employees and partners, net |  | Receivables from broker-dealers, clearing organizations, customers and related broker-dealers |  | Total
Beginning balance, January 1, 2024 | $ | 5.0 |  |  | $ | 2.3 |  |  | $ | 18.9 |  |  | $ | 26.2 |
Current-period provision for expected credit losses | $ | 1.1 |  |  | $ | — |  |  | $ | 2.6 |  |  | $ | 3.7 |
Release for allowance for expected credit losses | $ | — |  |  | $ | (2.3) |  |  | $ | — |  |  | $ | (2.3) |
Ending balance, September 30, 2024 | $ | 6.1 |  |  | $ | — |  |  | $ | 21.5 |  |  | $ | 27.6 |

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- References No definition available. + Details
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