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Incentive Plans - Schedule of Stock Unit Activity (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
$ / shares
shares
RSUs | MUSA 2023 Plan | Non-employee directors  
Number of Units  
Beginning balance (in shares) | shares 98,214
Granted (in shares) | shares 12,674
Vested (in shares) | shares (35,556)
Issued (in shares) | shares (35,556)
Forfeited (in shares) | shares (2,362)
Ending balance (in shares) | shares 72,970
Weighted Average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 285.60
Granted (in dollars per share) | $ / shares 492.34
Vested (in dollars per share) | $ / shares 201.38
Issued (in dollars per share) | $ / shares 201.38
Forfeited (in dollars per share) | $ / shares 285.06
Ending balance (in dollars per share) | $ / shares $ 362.23
Total Fair Value  
Total fair value vested | $ $ 16.6
Total fair value issued | $ 16.6
Total fair value, outstanding | $ $ 34.3
RSUs | 2013 Directors Plan | Non-employee directors  
Number of Units  
Beginning balance (in shares) | shares 9,436
Granted (in shares) | shares 2
Vested (in shares) | shares (7,174)
Issued (in shares) | shares (7,174)
Ending balance (in shares) | shares 2,264
Weighted Average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 196.38
Granted (in dollars per share) | $ / shares 457.52
Vested (in dollars per share) | $ / shares 175.84
Issued (in dollars per share) | $ / shares 175.84
Ending balance (in dollars per share) | $ / shares $ 261.51
Total Fair Value  
Total fair value vested | $ $ 3.5
Total fair value issued | $ 3.5
Total fair value, outstanding | $ $ 1.1
Employee PSUs | MUSA 2023 Plan | Employees  
Number of Units  
Beginning balance (in shares) | shares 77,395
Granted (in shares) | shares 49,102
Vested (in shares) | shares (61,288)
Issued (in shares) | shares (61,288)
Forfeited (in shares) | shares (1,040)
Ending balance (in shares) | shares 64,169
Weighted Average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 320.05
Granted (in dollars per share) | $ / shares 583.25
Vested (in dollars per share) | $ / shares 221.39
Issued (in dollars per share) | $ / shares 221.39
Forfeited (in dollars per share) | $ / shares 385.50
Ending balance (in dollars per share) | $ / shares $ 441.72
Total Fair Value  
Total fair value vested | $ $ 29.7
Total fair value issued | $ 29.7
Total fair value, outstanding | $ $ 30.1