| Fiscal period | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
| Period End Date | 12/31/2025 | 12/31/2024 | 12/31/2023 | 12/31/2022 | 12/31/2021 | 12/31/2020 | 12/31/2019 | 12/31/2018 | 12/31/2017 | 12/31/2016 |
| Petroleum product sales | 14,862.80 | 15,891.80 | 17,104.40 | 19,230.10 | 13,410.80 | 8,208.60 | 11,373.80 | 11,858.40 | 10,287.86 | 9,070.62 |
| Merchandise Sales | 4,303.80 | 4,214.80 | 4,089.30 | 3,903.20 | 3,677.70 | 2,955.10 | 2,620.10 | 2,423.00 | 2,372.66 | 2,338.59 |
| Ethanol sales and other | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Other operating revenues | 217.40 | 137.70 | 335.70 | 312.80 | 272.00 | 100.60 | 40.70 | 81.50 | 166.04 | 185.34 |
| Total Revenues | 19,384.00 | 20,244.30 | 21,529.40 | 23,446.10 | 17,360.50 | 11,264.30 | 14,034.60 | 14,362.90 | 12,826.55 | 11,594.55 |
| Petroleum product cost of goods sold | 13,589.80 | 14,556.40 | 15,929.70 | 17,910.10 | 12,535.50 | 7,325.70 | 10,707.40 | 11,251.10 | 9,773.21 | 8,603.95 |
| Merchandise cost of goods sold | 3,434.80 | 3,381.10 | 3,285.90 | 3,136.10 | 2,976.10 | 2,495.70 | 2,200.70 | 2,022.50 | 1,991.40 | 1,974.49 |
| Ethanol cost of goods sold | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Station and other operating expenses | 1,108.50 | -- | -- | 976.50 | 827.30 | 549.10 | 559.30 | 541.30 | 514.87 | 493.32 |
| Depreciation and amortization | 276.80 | 248.00 | 228.70 | 220.40 | 212.60 | 161.00 | 152.20 | 134.00 | 116.97 | 98.61 |
| Selling, general and administrative | 231.50 | 235.40 | 240.50 | 232.50 | 193.60 | 171.10 | 144.60 | 136.20 | 141.17 | 122.67 |
| Restructuring expense | 12.60 | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Accretion of asset retirement obligations | (3.40) | (3.20) | (3.00) | (2.70) | (2.50) | (2.30) | (2.10) | (2.00) | (1.79) | (1.65) |
| Acquisition related costs | -- | -- | -- | (1.50) | (10.40) | (1.70) | -- | -- | -- | -- |
| Impairment of properties | (5.30) | (8.20) | -- | -- | -- | -- | -- | -- | -- | -- |
| Station and other operating expenses | -- | (1,064.60) | (1,014.80) | -- | -- | -- | -- | -- | -- | -- |
| Gain (loss) on sale of assets | (2.80) | (4.50) | (0.80) | 2.10 | 1.50 | 1.30 | 0.10 | (1.10) | (3.95) | -- |
| Net settlement proceeds | -- | -- | -- | -- | -- | -- | 0.10 | 50.40 | -- | -- |
| Total costs and operating expenses | 18,662.70 | 19,496.90 | 20,702.60 | 22,479.80 | 16,758.00 | 10,706.60 | 13,766.30 | 14,087.10 | 12,539.41 | 11,294.69 |
| Income from operations | 718.50 | 742.90 | 826.00 | 968.40 | 604.00 | 559.00 | 268.50 | 325.10 | 283.19 | 299.87 |
| Interest expense | 110.90 | 97.10 | 98.50 | 85.30 | 82.40 | 51.20 | 54.90 | 52.90 | 46.66 | 39.70 |
| Gain on sale of assets | -- | -- | -- | -- | -- | -- | -- | -- | -- | 88.21 |
| Interest income | 0.20 | 6.40 | 6.90 | 3.00 | 0.10 | 1.00 | 3.20 | 1.50 | 1.31 | 0.58 |
| Other nonoperating income | 1.40 | (0.60) | -- | (2.30) | 0.20 | 0.30 | 0.40 | 0.20 | 2.18 | 3.08 |
| Loss on early debt extinguishment | -- | -- | -- | -- | -- | -- | (14.80) | -- | -- | -- |
| Total Other Income (Expense) | (109.30) | (91.30) | (91.60) | (84.60) | (82.10) | (49.90) | (66.10) | (51.20) | (43.17) | 52.17 |
| Income Before Income Taxes | 609.20 | 651.60 | 734.40 | 883.80 | 521.90 | 509.10 | 202.40 | 273.90 | 240.02 | 352.03 |
| Federal - Current | 70.10 | 115.50 | 141.50 | 143.50 | 86.20 | 96.00 | 15.60 | 18.40 | 39.15 | 74.93 |
| Federal - Deferred | 48.40 | 11.80 | 3.50 | 33.00 | 14.40 | 4.70 | 21.70 | 31.00 | (50.71) | 38.81 |
| Provision for Income Taxes - Total | 138.60 | 149.10 | 177.60 | 210.90 | 125.00 | 123.00 | 47.60 | 60.30 | (5.24) | 130.54 |
| State - Current and deferred | 20.10 | 21.80 | 32.60 | 34.40 | 24.40 | 22.30 | 10.30 | 10.90 | 6.33 | 16.80 |
| Income from continuing operations | -- | -- | -- | -- | -- | -- | -- | -- | 245.26 | 221.49 |
| Income from discontinued operations, net of income taxes | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net Income (Loss) Available to Common Shareholders | 470.60 | 502.50 | 556.80 | 672.90 | 396.90 | 386.10 | 154.80 | 213.60 | 245.26 | 221.49 |
| Income from Continuing Operations | -- | -- | -- | -- | -- | -- | -- | -- | 6.85 | 5.64 |
| Income from discontinued operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Earnings per share:Basic | 24.38 | 24.47 | 25.91 | 28.63 | 15.14 | 13.25 | 4.90 | 6.54 | 6.85 | 5.64 |
| Income from Continuing Operations | -- | -- | -- | -- | -- | -- | -- | -- | 6.78 | 5.59 |
| Income from discontinued operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Earnings per share:Diluted | 24.10 | 24.11 | 25.49 | 28.10 | 14.92 | 13.08 | 4.86 | 6.48 | 6.78 | 5.59 |
| Weighted-average shares outstanding:Basic | 19.30 | 20.53 | 21.49 | 23.51 | 26.21 | 29.13 | 31.59 | 32.67 | 35.82 | 39.27 |
| Weighted-average shares outstanding:Diluted | 19.53 | 20.84 | 21.84 | 23.95 | 26.60 | 29.53 | 31.86 | 32.98 | 36.16 | 39.65 |