Description of Business and Basis of Presentation	3 Months Ended
Description of Business and Basis of Presentation	Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation Description of business — Murphy USA Inc. and its consolidated subsidiaries (“Murphy USA”, "we", "our", "us", or the “Company”) markets refined products through a network of retail gasoline stores and to unbranded wholesale customers. In addition, we operate non-fuel convenience stores in select markets. The Company owns and operates a chain of retail stores under the brand names of Murphy USA® and Murphy Express, most of which are located in close proximity to Walmart stores, and also has a mix of convenience stores with and without retail gasoline that operate under the brand name of QuickChek®. At March 31, 2025, the Company had a total of 1,761 Company stores of which 1,607 were branded as Murphy and 154 were the QuickChek brand. The Company also has certain product supply and wholesale assets, including product distribution terminals and pipeline positions. Basis of Presentation — Murphy USA was incorporated in March 2013 and, in connection with its incorporation, Murphy USA issued 100 shares of common stock, par value $0.01 per share, to Murphy Oil Corporation (“Murphy Oil”) for $1.00. On August 30, 2013, Murphy USA was separated from Murphy Oil through the distribution of 100% of the common stock of Murphy USA to holders of Murphy Oil stock. Murphy USA Inc., Murphy Oil USA, Inc. and certain of its subsidiaries operate on a calendar year basis, while the QuickChek subsidiary uses a weekly retail calendar where each quarter has 13 weeks. For the three month period ended March 31, 2025, the QuickChek results covered the period December 28, 2024 to March 28, 2025. For the three month period ended March 31, 2024, the QuickChek results covered the period December 30, 2023 to March 29, 2024. The difference in timing of the period ends is immaterial to the overall consolidated results. In preparing the financial statements of Murphy USA in conformity with accounting principles generally accepted in the United States, management has made a number of estimates and assumptions related to the reporting of assets, liabilities, revenues, expenses and the disclosure of contingent assets and liabilities. Actual results may differ from these estimates. Interim Financial Information — The interim period financial information presented in these consolidated financial statements is unaudited and includes all known accruals and adjustments, in the opinion of management, necessary for a fair presentation of the consolidated financial position of Murphy USA and its results of operations and cash flows for the periods presented. All such adjustments are of a normal and recurring nature. These interim consolidated financial statements should be read together with our audited financial statements for the years ended December 31, 2024, 2023 and 2022, included in our Annual Report on Form 10-K (File No. 001-35914), as filed with the Securities and Exchange Commission under the Securities Exchange Act of 1934 on February 20, 2025. Recently Issued Accounting Standards— In December 2023, the FASB issued ASU 2023-09, "Improvements to Income Tax Disclosures." This ASU intends to enhance income tax disclosures, under Topic 740, to address investor requests for more transparency about income tax information through improvements to income tax disclosures primarily related to the rate reconciliation and income taxes paid information. The amendments in this Update improve the transparency of income tax disclosures by requiring (1) consistent categories and greater disaggregation of information in the rate reconciliation and (2) income taxes paid disaggregated by jurisdiction. The amendments in this Update are effective for the Company for annual periods beginning after December 15, 2024, with early adoption permitted. The amendments should be applied on a prospective basis, with retrospective application permitted. The Company has determined this will not have a material impact on the Company's consolidated financial statements. In November 2024, the FASB issued ASU 2024-03, "Disaggregation of Income Statement Expenses." This ASU addresses investor requests for more granular information about an entity’s expenses, allowing investors to better understand performance, prospects for future cash flows, and comparability over time and with other entities. The primary goal is to improve the decision-usefulness of expense information on public companies’ income statements through disaggregation of relevant expense captions in the notes to the financial statements. The amendments in this Update are effective for the Company for annual periods beginning after December 15, 2026, and interim periods in the year beginning after December 15, 2027. Early adoption is permitted. The amendments should be applied either prospectively or retrospectively. The Company is assessing the impact of the standard on the Company's consolidated financial statements.