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Disclosure - Organization and Basis of Presentation link:presentationLink link:calculationLink link:definitionLink 0000009 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 0000010 - Disclosure - Earnings per Share link:presentationLink link:calculationLink link:definitionLink 0000011 - Disclosure - Tax Receivable Agreements link:presentationLink link:calculationLink link:definitionLink 0000012 - Disclosure - Goodwill and Intangible Assets link:presentationLink link:calculationLink link:definitionLink 0000013 - Disclosure - Receivables from/Payables to Broker-Dealers and Clearing Organizations link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - Collateralized Transactions link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - Borrowings link:presentationLink link:calculationLink link:definitionLink 0000016 - Disclosure - Financial Assets and Liabilities link:presentationLink link:calculationLink link:definitionLink 0000017 - 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Disclosure - Goodwill and Intangible Assets - Goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 9954494 - Disclosure - Goodwill and Intangible Assets - Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9954494 - Disclosure - Goodwill and Intangible Assets - Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9954495 - Disclosure - Goodwill and Intangible Assets - Expects Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954496 - Disclosure - Receivables from/Payables to Broker-Dealers and Clearing Organizations (Details) link:presentationLink link:calculationLink link:definitionLink 9954497 - Disclosure - Collateralized Transactions (Details) link:presentationLink link:calculationLink link:definitionLink 9954498 - Disclosure - Borrowings - Short-term Borrowings, net (Details) link:presentationLink link:calculationLink link:definitionLink 9954499 - Disclosure - Borrowings - Broker-Dealer Credit Facilities (Details) link:presentationLink link:calculationLink link:definitionLink 9954500 - Disclosure - Borrowings - Broker-Dealer Credit Facilities Carrying Values, Net (Details) link:presentationLink link:calculationLink link:definitionLink 9954501 - Disclosure - Borrowings - Interest Expense on Broker-Dealer Facilities (Details) link:presentationLink link:calculationLink link:definitionLink 9954502 - Disclosure - Borrowings - Short-Term Bank Loans (Details) link:presentationLink link:calculationLink link:definitionLink 9954503 - Disclosure - Borrowings - Prime Brokerage Credit Facilities (Details) link:presentationLink link:calculationLink link:definitionLink 9954504 - Disclosure - Borrowings - Long-Term Borrowings (Details) link:presentationLink link:calculationLink link:definitionLink 9954505 - Disclosure - Borrowings - Credit Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 9954506 - Disclosure - 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Disclosure - Cash (Details) link:presentationLink link:calculationLink link:definitionLink 9954527 - Disclosure - Capital Structure - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954528 - Disclosure - Capital Structure - Amended and Restated 2015 Management Incentive Plan (Details) link:presentationLink link:calculationLink link:definitionLink 9954529 - Disclosure - Capital Structure - Amended and Restated Investment Technology Group, Inc. 2007 Omnibus Equity Compensation Plan (Details) link:presentationLink link:calculationLink link:definitionLink 9954530 - Disclosure - Capital Structure - Share Repurchase Program (Details) link:presentationLink link:calculationLink link:definitionLink 9954531 - Disclosure - Capital Structure - Employee Exchanges (Details) link:presentationLink link:calculationLink link:definitionLink 9954532 - Disclosure - Capital Structure - Schedule of Accumulated Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 9954533 - 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