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Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Inventory [Line Items] |  |
Inventories | $ 18.4 | $ 20.7
Asphalt |  |
Inventory [Line Items] |  |
Inventories | 4.2 | 8.0
Processed rock and sand |  |
Inventory [Line Items] |  |
Inventories | 7.9 | 6.6
Work in progress |  |
Inventory [Line Items] |  |
Inventories | 3.2 | 2.9
Retail merchandise |  |
Inventory [Line Items] |  |
Inventories | 2.1 | 2.0
Parts, materials and supplies inventories |  |
Inventory [Line Items] |  |
Inventories | $ 1.0 | $ 1.2

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