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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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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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