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Current Expected Credit Losses (CECL) (Tables) | 9 Months Ended
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Sep. 30, 2024
Credit Loss [Abstract] |
Schedule of Current Expected Credit Losses | During the three and nine months ended September 30, 2024 and 2023, 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, 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 of allowance for expected credit losses | $ | — |  |  | $ | (2.3) |  |  | $ | — |  |  | $ | (2.3) |
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, July 1, 2023 | $ | 5.1 |  |  | $ | 2.4 |  |  | $ | 11.0 |  |  | $ | 18.5 |
Current-period provision for expected credit losses | (0.2) |  |  | (0.2) |  |  | 2.0 |  |  | 1.6 |
Ending balance, September 30, 2023 | $ | 4.9 |  |  | $ | 2.2 |  |  | $ | 13.0 |  |  | $ | 20.1 |
| 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, 2023 | $ | 5.4 |  |  | $ | 2.5 |  |  | $ | 7.0 |  |  | $ | 14.9 |
Current-period provision for expected credit losses | $ | (0.5) |  |  | $ | (0.3) |  |  | $ | 6.0 |  |  | $ | 5.2 |
Ending balance, September 30, 2023 | $ | 4.9 |  |  | $ | 2.2 |  |  | $ | 13.0 |  |  | $ | 20.1 |

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 2: 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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