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Inventories | 12 Months Ended
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Dec. 31, 2020
Inventory Disclosure [Abstract] |
Inventories | Inventories Inventories are stated at the lower of cost (principally average cost, first-in, first-out basis) or net realizable value. Inventories as of December 31, 2020 and 2019 were as follows (in millions):
| 2020 |  | 2019
Asphalt | $ | 4.2 |  | $ | 8.0
Processed rock and sand | 7.9 |  | 6.6
Work in progress | 3.2 |  | 2.9
Retail merchandise | 2.1 |  | 2.0
Parts, materials and supplies inventories | 1.0 |  | 1.2
Total | $ | 18.4 |  | $ | 20.7

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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