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Current Expected Credit Losses (CECL) - Schedule of Current Expected Credit Losses (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | $ 16,800,000 | $ 9,200,000 | $ 14,900,000 | $ 2,400,000
Current-period provision for expected credit losses | 1,700,000 | 5,800,000 | 3,600,000 | 12,600,000
Ending balance | 18,500,000 | 15,000,000.0 | 18,500,000 | 15,000,000.0
Accrued commissions and other receivables, net |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 5,400,000 | 1,600,000 | 5,400,000 | 700,000
Current-period provision for expected credit losses | (300,000) | 3,200,000 | (300,000) | 4,100,000
Ending balance | 5,100,000 | 4,800,000 | 5,100,000 | 4,800,000
Loans, forgivable loans and other receivables from employees and partners, net |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 2,400,000 | 2,100,000 | 2,500,000 | 1,700,000
Current-period provision for expected credit losses | 0 | 1,200,000 | (100,000) | 1,600,000
Ending balance | 2,400,000 | 3,300,000 | 2,400,000 | 3,300,000
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 9,000,000.0 | 5,500,000 | 7,000,000.0 | 0
Current-period provision for expected credit losses | 2,000,000.0 | 1,400,000 | 4,000,000.0 | 6,900,000
Ending balance | $ 11,000,000.0 | $ 6,900,000 | $ 11,000,000.0 | $ 6,900,000

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