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Income Taxes (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Tax Credit Carryforward [Line Items]          
Provision for income taxes $ 27,268,000 $ 5,923,000 $ 55,780,000 $ 30,605,000  
Effective income tax rate Percent 17.60% 16.70% 18.90% 18.00%  
Current income taxes receivable $ 51,100,000   $ 51,100,000   $ 44,300,000
Current taxes payable 9,500,000   9,500,000   6,800,000
Valuation allowance on deferred taxes 0   0   0
Unrecognized tax benefits that would impact effective tax rate 7,900,000   7,900,000    
Non-US          
Tax Credit Carryforward [Line Items]          
Deferred tax asset, operating loss carryforward 56,600,000   56,600,000   57,100,000
ITG | Non-US          
Tax Credit Carryforward [Line Items]          
Operating loss carryforwards 302,400,000   302,400,000   304,500,000
KCG | Non-US          
Tax Credit Carryforward [Line Items]          
Operating loss carryforwards $ 302,400,000   $ 302,400,000   $ 304,500,000