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Incentive Plans (Schedule of Stock Unit Activity) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2023
2013 Plan — Employee RSUs | MUSA 2013 Plan | Employees |  |  |
Number of units |  |  |
Beginning balance (in shares) |  | 149,366 | 149,366
Granted (in shares) |  |  | 34,600
Vested (in shares) |  |  | (60,735)
Issued (in shares) |  |  | (60,735)
Forfeited (in shares) |  |  | (2,642)
Ending balance (in shares) | 120,589 |  | 120,589
Weighted Average Grant Date Fair Value |  |  |
Beginning balance (in dollars per share) |  | $ 125.51 | $ 125.51
Granted (in dollars per share) |  |  | 256.84
Vested (in dollars per share) |  |  | 80.07
Issued (in dollars per share) |  |  | 80.07
Forfeited (in dollars per share) |  |  | 176.19
Ending balance (in dollars per share) | $ 198.08 |  | $ 198.08
Total Fair Value |  |  |
Total fair value vested |  |  | $ 16.0
Total fair value issued |  |  | 16.0
Total fair value, outstanding | $ 41.2 |  | $ 41.2
2013 Plan — Employee RSUs | 2013 Directors Plan | Non-employee directors |  |  |
Number of units |  |  |
Beginning balance (in shares) |  | 26,923 | 26,923
Granted (in shares) |  |  | 6,584
Vested (in shares) |  |  | (9,880)
Issued (in shares) |  |  | (9,880)
Ending balance (in shares) | 23,627 |  | 23,627
Weighted Average Grant Date Fair Value |  |  |
Beginning balance (in dollars per share) |  | $ 132.38 | $ 132.38
Granted (in dollars per share) |  |  | 258.35
Vested (in dollars per share) |  |  | 110.19
Issued (in dollars per share) |  |  | 110.19
Ending balance (in dollars per share) | $ 177.98 |  | $ 177.98
Total Fair Value |  |  |
Total fair value vested |  |  | $ 2.7
Total fair value issued |  |  | 2.7
Total fair value, outstanding | $ 8.1 |  | $ 8.1
2013 Plan — Employee PSUs | MUSA 2013 Plan | Employees |  |  |
Number of units |  |  |
Beginning balance (in shares) |  | 106,001 | 106,001
Granted (in shares) |  |  | 62,275
Vested (in shares) |  |  | (72,799)
Issued (in shares) |  |  | (72,799)
Ending balance (in shares) | 95,477 |  | 95,477
Weighted Average Grant Date Fair Value |  |  |
Beginning balance (in dollars per share) |  | $ 160.03 | $ 160.03
Granted (in dollars per share) |  |  | 292.52
Vested (in dollars per share) |  |  | 121.83
Issued (in dollars per share) |  |  | 121.83
Ending balance (in dollars per share) | $ 218.97 |  | $ 218.97
Total Fair Value |  |  |
Total fair value vested |  |  | $ 19.0
Total fair value issued |  |  | 19.0
Total fair value, outstanding | $ 32.6 |  | $ 32.6
Restricted Stock Units (RSUs) And | MUSA 2023 Plan | Non-employee directors |  |  |
Number of units |  |  |
Beginning balance (in shares) |  | 0 | 0
Granted (in shares) |  |  | 692
Vested (in shares) |  |  | 0
Issued (in shares) |  |  | 0
Ending balance (in shares) | 692 |  | 692
Weighted Average Grant Date Fair Value |  |  |
Beginning balance (in dollars per share) |  | $ 0 | $ 0
Granted (in dollars per share) |  |  | 325.32
Vested (in dollars per share) |  |  | 0
Issued (in dollars per share) |  |  | 0
Ending balance (in dollars per share) | $ 325.32 |  | $ 325.32
Total Fair Value |  |  |
Total fair value vested |  |  | $ 0.0
Total fair value issued |  |  | 0.0
Total fair value, outstanding | $ 0.2 |  | $ 0.2
DSUs | 2013 Directors Plan | Non-employee directors |  |  |
Number of units |  |  |
Granted (in shares) | 1 | 421 |
Vested (in shares) | (1) |  |
Ending balance (in shares) | 422 |  | 422
Weighted Average Grant Date Fair Value |  |  |
Ending balance (in dollars per share) | $ 258.05 |  | $ 258.05
DSUs | MUSA 2023 Plan | Non-employee directors |  |  |
Number of units |  |  |
Granted (in shares) | 692 |  |
Ending balance (in shares) | 692 |  | 692
Weighted Average Grant Date Fair Value |  |  |
Ending balance (in dollars per share) | $ 325.32 |  | $ 325.32

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