Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Operating Revenues
Total operating revenues		$ 5,005.0	$ 5,451.7	$ 9,530.4	$ 10,295.4
Operating Expenses
Store and other operating expenses		275.2	269.9	541.3	522.0
Depreciation and amortization		66.0	59.3	134.2	118.0
Selling, general and administrative		50.9	59.1	111.0	121.2
Accretion of asset retirement obligations		0.8	0.8	1.7	1.6
Total operating expenses		4,785.8	5,233.2	9,222.9	9,972.1
Gain (loss) on sale of assets		0.0	(1.4)	(0.3)	(1.0)
Income (loss) from operations		219.2	217.1	307.2	322.3
Other income (expense)
Investment income (expense)		0.1	0.9	0.0	2.1
Interest expense		(27.8)	(24.9)	(53.2)	(49.8)
Other nonoperating income (expense)		1.0	0.1	0.4	0.5
Total other income (expense)		(26.7)	(23.9)	(52.8)	(47.2)
Income before income taxes		192.5	193.2	254.4	275.1
Income tax expense (benefit)		46.9	48.4	55.6	64.3
Net Income		$ 145.6	$ 144.8	$ 198.8	$ 210.8
Basic and Diluted Earnings Per Common Share:
Basic (in dollars per share)		$ 7.44	$ 7.02	$ 10.07	$ 10.17
Diluted (in dollars per share)		$ 7.36	$ 6.92	$ 9.95	$ 10.02
Weighted-Average Common Shares Outstanding (in thousands):
Basic (in shares)		19,546	20,643	19,738	20,728
Diluted (in shares)		19,765	20,922	19,985	21,043
Supplemental information:
Includes excise taxes of		$ 599.5	$ 597.5	$ 1,151.3	$ 1,156.3
Petroleum product sales
Operating Revenues
Total operating revenues	[1]	3,851.4	4,340.5	7,341.2	8,152.2
Operating Expenses
Cost of goods sold	[1]	3,519.2	3,980.2	6,757.5	7,536.3
Merchandise sales
Operating Revenues
Total operating revenues		1,092.4	1,080.4	2,091.8	2,081.1
Operating Expenses
Cost of goods sold		873.7	863.9	1,677.2	1,673.0
Other operating revenues
Operating Revenues
Total operating revenues		$ 61.2	$ 30.8	$ 97.4	$ 62.1

[1] Includes excise taxes of $599.5 million, $597.5 million and $1,151.3 million, $1,156.3 million for the three and six months ended June 30, 2025 and 2024, respectively.