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Income Taxes - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Tax Credit Carryforward [Line Items] |  |  |
Provision for income taxes | $ 28,512,000 | $ 24,682,000 |
Effective income tax rate Percent | 20.40% | 18.30% |
Current income taxes receivable | $ 54,700,000 |  | $ 44,300,000
Current taxes payable | 10,600,000 |  | 6,800,000
Valuation allowance on deferred taxes | 0 |  | 0
Unrecognized tax benefits that would impact effective tax rate | 7,600,000 |  |
Non-US |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Deferred tax asset, operating loss carryforward | 56,900,000 |  | 57,100,000
ITG | Non-US |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Operating loss carryforwards | 303,400,000 |  | 304,500,000
KCG | Non-US |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Operating loss carryforwards | $ 303,400,000 |  | $ 304,500,000

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