v3.26.1
Incentive Plans - Schedule of Stock Unit Activity (Details)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2026
USD ($)
$ / shares
shares
RSUs | Employees | Murphy USA, Two Thousand Thirteen Plan  
Number of Units  
Beginning balance (in shares) | shares 81,915
Granted (in shares) | shares 27,916
Vested (in shares) | shares (30,435)
Issued (in shares) | shares (30,435)
Forfeited (in shares) | shares (5,377)
Ending balance (in shares) | shares 74,019
Weighted Average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 376.60
Granted (in dollars per share) | $ / shares 441.82
Vested (in dollars per share) | $ / shares 287.25
Issued (in dollars per share) | $ / shares 287.25
Forfeited (in dollars per share) | $ / shares 401.67
Ending balance (in dollars per share) | $ / shares $ 435.82
Total Fair Value  
Total fair value vested | $ $ 13.8
Total fair value issued | $ 13.8
Total fair value, outstanding | $ $ 39.9
PSUs | Employees | Murphy USA, Two Thousand Thirteen Plan  
Number of Units  
Beginning balance (in shares) | shares 59,604
Granted (in shares) | shares 30,352
Vested (in shares) | shares (38,178)
Issued (in shares) | shares (38,178)
Forfeited (in shares) | shares (5,166)
Ending balance (in shares) | shares 46,612
Weighted Average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 438.28
Granted (in dollars per share) | $ / shares 425.34
Vested (in dollars per share) | $ / shares 303.84
Issued (in dollars per share) | $ / shares 303.84
Forfeited (in dollars per share) | $ / shares 481.61
Ending balance (in dollars per share) | $ / shares $ 499.57
Total Fair Value  
Total fair value vested | $ $ 13.9
Total fair value issued | $ 13.9
Total fair value, outstanding | $ $ 25.1
2013 Plan — Director RSUs | Non-employee directors | 2013 Directors Plan  
Number of Units  
Beginning balance (in shares) | shares 2,274
Granted (in shares) | shares 6
Vested (in shares) | shares 0
Issued (in shares) | shares 0
Ending balance (in shares) | shares 2,280
Weighted Average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 261.51
Granted (in dollars per share) | $ / shares 478.90
Vested (in dollars per share) | $ / shares 0.00
Issued (in dollars per share) | $ / shares 0.00
Ending balance (in dollars per share) | $ / shares $ 261.51
Total Fair Value  
Total fair value vested | $ $ 0.0
Total fair value issued | $ 0.0
Total fair value, outstanding | $ $ 1.2