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Current Expected Credit Losses (CECL) (Tables) | 12 Months Ended
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Dec. 31, 2024
Credit Loss [Abstract] |
Schedule of Changes in CECL Allowance Reserve | During the years ended December 31, 2024, 2023 and 2022, 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, January 1, 2022 | $ | 0.7 |  |  | $ | 1.7 |  |  | $ | — |  |  | $ | 2.4 |
Current-period provision for expected credit losses | 4.7 |  |  | 0.8 |  |  | 7.0 |  |  | 12.5 |
Ending Balance, December 31, 2022 | 5.4 |  |  | 2.5 |  |  | 7.0 |  |  | 14.9 |
Current-period provision for expected credit losses | (0.4) |  |  | (0.2) |  |  | 11.9 |  |  | 11.3 |
Ending Balance, December 31, 2023 | 5.0 |  |  | 2.3 |  |  | 18.9 |  |  | 26.2 |
Current-period provision for expected credit losses | 1.2 |  |  | — |  |  | 2.1 |  |  | 3.3 |
Release of allowance for expected credit losses | — |  |  | (2.3) |  |  | — |  |  | (2.3) |
Ending Balance, December 31, 2024 | $ | 6.2 |  |  | $ | — |  |  | $ | 21.0 |  |  | $ | 27.2 |

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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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