BASIS OF PRESENTATION AND CONSOLIDATION AND ACCOUNTING POLICIES	6 Months Ended
	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION AND CONSOLIDATION AND ACCOUNTING POLICIES	BASIS OF PRESENTATION AND CONSOLIDATION AND ACCOUNTING POLICIES Basis of Presentation and Consolidation The accompanying Condensed Consolidated Financial Statements and notes thereto, have been prepared in accordance with U.S. GAAP for interim financial information and in accordance with the rules and regulations of the SEC. Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. Results for interim periods are not necessarily indicative of the results that can be expected for a full year and therefore should be read in conjunction with the Company’s audited Financial Statements and notes thereto included within the Company’s 2021 Form 10-K. All intercompany balances and transactions have been eliminated in consolidation. The accompanying Condensed Consolidated Financial Statements reflect the consolidated accounts of the parent company, Group 1 Automotive, Inc., and its subsidiaries, all of which are wholly owned. On November 12, 2021, the Company entered into a Share Purchase Agreement (the “Brazil Agreement”) with Original Holdings S.A. (“Buyer”). Pursuant to the terms and conditions set forth in the Brazil Agreement, Buyer agreed to acquire 100% of the issued and outstanding equity interests of the Company’s Brazilian operations (the “Brazil Disposal Group”) for approximately BRL 510.0 million in cash (the “Brazil Disposal”). On July 1, 2022, the Company completed the Brazil Disposal. The Brazil Disposal Group met the criteria to be reported as held for sale and discontinued operations. Therefore, the related assets, liabilities and operating results of the Brazil Disposal Group are reported as discontinued operations (the “Brazil Discontinued Operations”) for all periods presented. The Brazil Disposal Group was previously included in the Brazil segment. Effective as of the fourth quarter of 2021, the Company is aligned into two reportable segments: U.S. and U.K. Refer to Note 5. Segment Information for additional information on the Company’s segments. Unless otherwise specified, disclosures in these Condensed Consolidated Financial Statements reflect continuing operations only. Certain prior-period amounts, primarily related to the Brazil Discontinued Operations, have been reclassified in the Condensed Consolidated Financial Statements and accompanying notes to conform to current-period presentation. Refer to Note 4. Discontinued Operations and Other Divestitures for additional information. Certain amounts in the Condensed Consolidated Financial Statements and the accompanying notes may not compute due to rounding. All computations have been calculated using unrounded amounts for all periods presented. These Condensed Consolidated Financial Statements reflect, in the opinion of management, all normal recurring adjustments necessary to fairly state, in all material respects, the Company’s financial position and results of operations for the periods presented. Use of Estimates The preparation of the Company’s financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the balance sheet date and the amounts of revenues and expenses recognized during the reporting period. Management analyzes the Company’s estimates based on historical experience and other assumptions that are believed to be reasonable under the circumstances; however, actual results could differ materially from such estimates. The significant estimates made by management in the accompanying Condensed Consolidated Financial Statements include, but not limited to, inventory valuation adjustments, reserves for future chargebacks on finance, insurance and VSC fees, self-insured property and casualty insurance exposure, the fair value of assets acquired and liabilities assumed in business combinations, the valuation of goodwill and intangible franchise rights and reserves for potential litigation.