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Current Expected Credit Losses (CECL) - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Current-period provision for expected credit losses | $ 1.1 | $ 1.5 |  |
Current expected credit losses reserve | 28.3 | 27.7 | $ 27.2 | $ 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 | 0.9 |  |
Current expected credit losses reserve | 6.2 | 5.9 | 6.2 | 5.0
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 | 1.1 | 0.6 |  |
Current expected credit losses reserve |  | $ 19.5 | $ 21.0 | $ 18.9
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers | Russia/Ukraine Conflit |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Current expected credit losses reserve | $ 22.1 |  |  |

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