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Incentive Plans - Narrative (Details)
1 Months Ended 3 Months Ended
Feb. 29, 2024
peer_company
$ / shares
Mar. 31, 2025
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
Dec. 31, 2024
$ / shares
shares
May 04, 2023
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation | $   $ 5,900,000 $ 5,600,000    
Total income tax benefits realized from tax deductions related to stock option exercises under share-based payment arrangements | $   $ 0 $ 500,000    
MUSA 2013 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized for incentive plan (no more than) (in shares)   5,500,000      
Number of shares per employee (no more than) (in shares)   1,000,000      
Maximum amount payable | $   $ 5,000,000      
MUSA 2023 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized for incentive plan (no more than) (in shares)         1,725,000
Award expiration period (in years)   7 years      
Shares granted, fair value (in dollars per share) | $ / shares   $ 154.07      
MUSA 2023 Plan | RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years)   3 years      
MUSA 2023 Plan | RSUs | Non-employee directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years)   1 year      
Granted (in shares)   12,674      
Outstanding (in shares)   72,970   98,214  
Weighted average grant date fair value (in dollars per share) | $ / shares   $ 362.23   $ 285.60  
Restricted stock units issued, weighted average grant date fair value (in dollars per share) | $ / shares   $ 492.34      
MUSA 2023 Plan | RSUs | In 2023 | Non-employee directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years)   1 year      
MUSA 2023 Plan | DSUs | Non-employee directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share of common stock right   1      
Granted (in shares)   192      
Share-based compensation | $   $ 100,000      
Outstanding (in shares)   1,931      
Weighted average grant date fair value (in dollars per share) | $ / shares   $ 399.31      
MUSA 2023 Plan | Return On Average Capital Employed Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years) 3 years        
MUSA 2023 Plan | Total Shareholder Return Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years) 3 years        
Number of companies in total shareholder return peer comparison group | peer_company 17        
MUSA 2023 Plan | PSUs | TSR          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units issued, weighted average grant date fair value (in dollars per share) | $ / shares $ 674.28        
MUSA 2023 Plan | PSUs | ROACE          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units issued, weighted average grant date fair value (in dollars per share) | $ / shares $ 492.22        
2013 Directors Plan | RSUs | Non-employee directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)   2      
Outstanding (in shares)   2,264   9,436  
Weighted average grant date fair value (in dollars per share) | $ / shares   $ 261.51   $ 196.38  
Restricted stock units issued, weighted average grant date fair value (in dollars per share) | $ / shares   $ 457.52      
2013 Directors Plan | RSUs | In 2023 | Non-employee directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years)   1 year      
2013 Directors Plan | RSUs | Prior to 2023 | Non-employee directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years)   3 years      
2013 Directors Plan | DSUs | Non-employee directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share of common stock right   1      
Outstanding (in shares)   425      
Weighted average grant date fair value (in dollars per share) | $ / shares   $ 258.35