ORGANIZATION AND BASIS OF PRESENTATION (Policies)	6 Months Ended
Jun. 30, 2021
ORGANIZATION AND BASIS OF PRESENTATION
Basis of Presentation	Basis of Presentation These interim unaudited condensed consolidated financial statements have been prepared in accordance with GAAP as established by FASB for interim financial information and with the instructions to Form 10-Q and should be read in conjunction with the consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020. The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities, and reported amounts of revenues and expenses. On an ongoing basis, management evaluates its estimates based upon historical experience, observance of trends, information available from outside sources and various other assumptions that management believes to be reasonable under the circumstances. Actual results may differ from these estimates under different conditions or assumptions. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation of financial position, results of operations and cash flows at the dates and for the periods presented have been included. The results of operations for interim periods are not necessarily indicative of the results of operations for the full year.
Segment information	Segment information The Company has five business segments: Options, North American Equities, Futures, Europe, and Global FX, which is reflective of how the Company’s chief operating decision-maker reviews and operates the business. See Note 14 (“Segment Reporting”) for more information.
Update to Significant Accounting Policies	Update to Significant Accounting Policies There have been no new or material changes to the significant accounting policies discussed in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020, that are of significance, or potential significance, to the Company.
Recent Accounting Pronouncements	Recent Accounting Pronouncements - Adopted In December 2019, the FASB issued Accounting Standards Update (“ASU”) 2019-12, Income Taxes (Topic 740) – Simplifying the Accounting for Income Taxes. This ASU removed certain income tax exceptions and modifies existing guidance to simplify the accounting for income taxes. For public entities, the update was effective for fiscal years and interim period within those fiscal years, beginning after December 15, 2020. The Company adopted this ASU on January 1, 2021, which did not result in a material impact to the condensed consolidated financial statements and disclosures. Recent Accounting Pronouncements - Issued, not yet Adopted There are no applicable material accounting pronouncements that have been issued but are not yet adopted as of June 30, 2021.

ORGANIZATION AND BASIS OF PRESENTATION

Segment information

The Company has five business segments: Options, North American Equities, Futures, Europe, and Global FX, which is reflective of how the Company’s chief operating decision-maker reviews and operates the business. See Note 14 (“Segment Reporting”) for more information.

Recent Accounting Pronouncements

Recent Accounting Pronouncements - Adopted

In December 2019, the FASB issued Accounting Standards Update (“ASU”) 2019-12, Income Taxes (Topic 740) – Simplifying the Accounting for Income Taxes. This ASU removed certain income tax exceptions and modifies existing guidance to simplify the accounting for income taxes. For public entities, the update was effective for fiscal years and interim period within those fiscal years, beginning after December 15, 2020. The Company adopted this ASU on January 1, 2021, which did not result in a material impact to the condensed consolidated financial statements and disclosures.

Recent Accounting Pronouncements - Issued, not yet Adopted

There are no applicable material accounting pronouncements that have been issued but are not yet adopted as of June 30, 2021.