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Cover
 9 Months Ended
Sep. 30, 2023
shares
Cover [Abstract]  
Document Type 10-Q
Document Quarterly Report true
Document Period End Date Sep. 30, 2023
Document Transition Report false
Entity File Number 001-35914
Entity Registrant Name MURPHY USA INC.
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 46-2279221
Entity Address, Address Line One 200 Peach Street
Entity Address, City or Town El Dorado,
Entity Address, State or Province AR
Entity Address, Postal Zip Code 71730-5836
City Area Code 870
Local Phone Number 875-7600
Title of 12(b) Security Common Stock, $0.01 Par Value
Trading Symbol MUSA
Security Exchange Name NYSE
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Small Business false
Entity Emerging Growth Company false
Entity Shell Company false
Entity Common Stock, Shares Outstanding 21,277,031
Amendment Flag false
Entity Central Index Key 0001573516
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2023
Document Fiscal Period Focus Q3