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Inventories (Tables) | 3 Months Ended
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Mar. 31, 2020
Inventory Disclosure [Abstract] |
Schedule of Inventories | Inventories are stated at the lower of cost (principally first-in, first-out basis) or net realizable value. Inventories as of March 31, 2020 and December 31, 2019 were as follows (in millions):
|  | March 31, |  | December 31,
|  | 2020 |  | 2019
Asphalt |  |  | $ | 8.1 |  |  | $ | 8.0 |
Processed rock and sand |  |  | 6.2 |  |  | 6.6 |
Work in progress |  |  | 3.1 |  |  | 2.9 |
Retail merchandise |  |  | 2.0 |  |  | 2.0 |
Parts, materials and supplies inventories |  |  | 1.3 |  |  | 1.2 |
Total |  | 20.7 |  |  | $ | 20.7 |

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