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Current Expected Credit Losses (CECL) - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Current-period provision for expected credit losses | $ 3.3 | $ 11.3 | $ 12.5 |
Current expected credit losses reserve | 27.2 | 26.2 | 14.9 | $ 2.4
Release of allowance for expected credit losses | (2.3) |  |  |
Accrued commissions and other receivables, net |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Current-period provision for expected credit losses | 1.2 | (0.4) | 4.7 |
Current expected credit losses reserve | 6.2 | 5.0 | 5.4 | 0.7
Release of allowance for expected credit losses | 0.0 |  |  |
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 | (0.2) | 0.8 |
Current expected credit losses reserve | 0.0 | 2.3 | 2.5 | 1.7
Release of allowance for expected credit losses | (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 | 2.1 | 11.9 | 7.0 |
Current expected credit losses reserve | 21.0 | $ 18.9 | $ 7.0 | $ 0.0
Release of allowance for expected credit losses | 0.0 |  |  |
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers | Russia/Ukraine Conflict |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Current expected credit losses reserve | $ 21.0 |  |  |

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