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Inventories (Schedule of Inventories) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Inventory Disclosure [Abstract] |  |
Petroleum products - FIFO basis | $ 430.5 | $ 367.0
Store merchandise for resale - FIFO basis | 203.6 | 192.1
Less LIFO reserve | (313.7) | (250.7)
Total petroleum products and store merchandise inventory | 320.4 | 308.4
Materials and supplies | 15.0 | 10.7
Inventories, at lower of cost or market | $ 335.4 | $ 319.1

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