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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