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Current Expected Credit Losses (CECL) - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Current-period provision for expected credit losses | $ 1.9 | $ 6.8 |  |
Current expected credit losses reserve | 16.8 | 9.2 | $ 14.9 | $ 2.4
Accrued commissions and other receivables, net |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Current-period provision for expected credit losses | 0.0 | 0.9 |  |
Current expected credit losses reserve | 5.4 | 1.6 | 5.4 | 0.7
Accrued commissions and other receivables, net | Russia/Ukraine Conflit |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Current expected credit losses reserve |  | 0.5 |  |
Loans, forgivable loans and other receivables from employees and partners, net |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Current-period provision for expected credit losses | (0.1) | 0.4 |  |
Current expected credit losses reserve | 2.4 | 2.1 | 2.5 | 1.7
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Current-period provision for expected credit losses | 2.0 | 5.5 |  |
Current expected credit losses reserve | $ 9.0 | $ 5.5 | $ 7.0 | $ 0.0

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