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Inventories | 3 Months Ended
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Mar. 31, 2026
Inventory Disclosure [Abstract] |
Inventories | Inventories Inventories consisted of the following:
(Millions of dollars) |  | March 31, 2026 |  | December 31, 2025
Petroleum products - FIFO basis |  | $ | 437.3 |  |  | $ | 305.8 |
Store merchandise for resale - FIFO basis |  | 258.0 |  |  | 254.7 |
Less LIFO reserve |  | (347.0) |  |  | (162.6) |
Total petroleum products and store merchandise inventory |  | 348.3 |  |  | 397.9 |
Materials and supplies |  | 15.0 |  |  | 15.1 |
Total inventories |  | $ | 363.3 |  |  | $ | 413.0 |
At March 31, 2026 and December 31, 2025, the replacement cost (market value) of LIFO inventories exceeded the LIFO carrying value for petroleum products by $347.0 million and $162.6 million, respectively.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 330 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/330/tableOfContent + Details
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