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Credit Losses (Tables) | 12 Months Ended
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Dec. 31, 2022
Credit Loss [Abstract] |
Financing Receivable, Allowance for Credit Loss | During the years ended December 31, 2022, 2021 and 2020, the Company recorded changes in the CECL reserve 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, 2020 | $ | 0.8 |  |  | $ | 1.1 |  |  | $ | — |  |  | $ | 1.9 |
Current-period provision for expected credit losses | 0.2 |  |  | 0.5 |  |  | — |  |  | 0.7 |
Ending balance, December 31, 2020 | 1.0 |  |  | 1.6 |  |  | — |  |  | 2.6 |
Current-period provision for expected credit losses | (0.3) |  |  | 0.1 |  |  | — |  |  | (0.2) |
Ending balance, December 31, 2021 | 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 |

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