Organization and Basis of Presentation	12 Months Ended
Organization and Basis of Presentation	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Organization The accompanying consolidated financial statements include the accounts and operations of Virtu Financial, Inc. (“VFI” or, collectively with its wholly owned or controlled subsidiaries, “Virtu” or the “Company”). VFI is a Delaware corporation whose primary asset is its ownership interest in Virtu Financial LLC (“Virtu Financial”). As of December 31, 2020, VFI owned approximately 64.1% of the membership interests of Virtu Financial. VFI is the sole managing member of Virtu Financial and operates and controls all of the businesses and affairs of Virtu Financial and its subsidiaries (the “Group”). The Company is a leading financial firm that leverages cutting edge technology to deliver liquidity to the global markets and innovative, transparent trading solutions to its clients. The Company provides deep liquidity in over 25,000 financial instruments, on over 235 venues, in 36 countries worldwide to help create more efficient markets. Leveraging its global market structure expertise and scaled, multi-asset infrastructure, the Company provides its clients with a robust product suite including offerings in execution, liquidity sourcing, analytics and broker-neutral, multi-dealer platforms in workflow technology. The Company’s product offerings allow its clients to trade on hundreds of venues in over 50 countries and across multiple asset classes, including global equities, ETFs, foreign exchange, futures, fixed income and other commodities. The Company’s integrated, multi-asset analytics platform provides a range of pre and post-trade services, data products and compliance tools that its clients rely upon to invest, trade and manage risk across global markets. The Company has completed two significant acquisitions over the past four years that have expanded and complemented Virtu Financial's original electronic trading and marking making business. On July 20, 2017 (the “KCG Closing Date”), the Company completed the all-cash acquisition of KCG Holdings, Inc. (“KCG”) (the “Acquisition of KCG”). On March 1, 2019 (the “ITG Closing Date”), the Company completed the acquisition of Investment Technology Group, Inc. and its subsidiaries (“ITG”) in an all-cash transaction valued at $30.30 per ITG share, for a total of approximately $1.0 billion (the “ITG Acquisition”). ITG was a global financial technology company. ITG's business contributes to the Company's Execution Services segment. See Note 3 "ITG Acquisition" for further details. Virtu Financial’s principal U.S. subsidiary is Virtu Americas LLC (“VAL”), which is a U.S. broker-dealer. As part of the Company's integration efforts, the Company consolidated the operations of its other historical U.S. broker-dealer subsidiaries. Specifically, the broker-dealer activities of Virtu Financial BD LLC and Virtu Financial Capital Markets LLC were consolidated within VAL as of December 31, 2019 and the SEC registrations were withdrawn in March 2020. The Company consolidated the broker-dealer activities of Virtu ITG LLC ("VITG") and Virtu Alternet Securities within VAL as of June 1, 2020 and the SEC registrations were withdrawn in August 2020. Other principal U.S. subsidiaries include Virtu Financial Global Markets LLC, a U.S. trading entity focused on futures and currencies; Virtu ITG Analytics LLC, a provider of pre and post-trade analysis, fair value, and trade optimization services; and Virtu ITG Platforms LLC, a provider of workflow technology solutions and network connectivity services. Principal foreign subsidiaries include Virtu Financial Ireland Limited and Virtu ITG Europe Limited, each formed in Ireland; Virtu ITG UK Limited, formed in the United Kingdom; Virtu ITG Canada Corp. and Virtu Financial Canada ULC, each formed in Canada; Virtu Financial Asia Pty Ltd. and Virtu ITG Australia Limited, each formed in Australia; Virtu ITG Hong Kong Limited, formed in Hong Kong; and Virtu Financial Singapore Pte. Ltd. and Virtu ITG Singapore Pte. Ltd., each formed in Singapore, all of which are trading entities focused on asset classes in their respective geographic regions. The Company has two operating segments: (i) Market Making and (ii) Execution Services; and one non-operating segment: Corporate. See Note 23 "Geographic Information and Business Segments" for a further discussion of the Company’s segments. Basis of Consolidation and Form of Presentation These consolidated financial statements are presented in U.S. dollars, have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding financial reporting with respect to Form 10-K and accounting standards generally accepted in the United States of America (“U.S. GAAP”) promulgated by the Financial Accounting Standards Board (“FASB”) in the Accounting Standards Codification (“ASC” or the “Codification”), and reflect all adjustments that, in the opinion of management, are normal and recurring, and that are necessary for a fair statement of the results for the periods presented. The consolidated financial statements of the Company include its equity interests in Virtu Financial and its subsidiaries. As sole managing member of Virtu Financial, the Company exerts control over the Group’s operations. The Company consolidates Virtu Financial and its subsidiaries’ financial statements and records the interests in Virtu Financial that the Company does not own as noncontrolling interests. All intercompany accounts and transactions have been eliminated in consolidation. Certain reclassifications have been made to the prior periods’ consolidated financial statements in order to conform to the current period presentation. Such reclassifications are immaterial, individually and in the aggregate, to both current and all previously issued financial statements taken as a whole and have no effect on previously reported consolidated net income available to common stockholders. Effective for the quarter ended June 30, 2020, the Company has changed the presentation of its Consolidated Statements of Comprehensive Income. As a result, the Company made the following reclassifications to prior period amounts to be consistent with current period presentation. For the years ended December 31, 2019 and 2018, the Company reclassified $102.1 million and $74.6 million, respectively, of Payments for order flow to Brokerage, exchange, clearance fees and payments for order flow, net, previously reported as Payments for order flow and Brokerage, exchange and clearance fees, net, respectively. Brokerage, exchange and clearance fees, net and Payments for order flow both represent costs associated with transacting trades. For the year ended December 31, 2019, the Company reclassified $12.6 million of sublease income from Other, net within Total revenues to net with other occupancy costs recorded in Operations and administrative within Operating expenses.