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Current Expected Credit Losses (CECL) - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Current-period provision for expected credit losses | $ (0.4) | $ (0.1) | $ 1.6 | $ 3.7 |  |  |  |
Current expected credit losses reserve | 24.8 | 27.6 | 24.8 | 27.6 | $ 25.2 | $ 27.2 | $ 27.7 | $ 26.2
Accrued commissions and other receivables, net |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Current-period provision for expected credit losses | 0.0 | 0.1 | 0.9 | 1.1 |  |  |  |
Current expected credit losses reserve | 7.1 | 6.1 | 7.1 | 6.1 | 7.1 | 6.2 | 6.0 | 5.0
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 | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |
Current expected credit losses reserve | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 2.3
Financing receivable, allowance for credit loss, period increase (decrease) | 0.0 | 0.0 | 0.0 | (2.3) |  |  |  |
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 | (0.4) | (0.2) | 0.7 | 2.6 |  |  |  |
Current expected credit losses reserve | $ 17.7 | $ 21.5 | 17.7 | $ 21.5 | $ 18.1 | $ 21.0 | $ 21.7 | $ 18.9
Financing receivable, allowance for credit loss, period increase (decrease) |  |  | $ (3.3) |  |  |  |  |

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