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Supplemental Balance Sheet Information - Inventories (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Inventory, LIFO, Net [Abstract] |  |
Raw materials | $ 37.3 | $ 26.6
Work in process | 25.6 | 20.4
Finished goods | 40.0 | 40.0
Supplies and other | 0.0 | 0.0
Inventory, gross | 102.9 | 87.0
Excess of FIFO or weighted-average cost over LIFO cost | (12.9) | (13.0)
Inventories, net | 90.0 | 74.0
Inventory, Non-LIFO, Net [Abstract] |  |
Raw materials | 1.2 | 1.5
Work in process | 0.4 | 0.3
Finished goods | 10.3 | 9.6
Supplies and other | 5.9 | 5.7
Inventory, gross | 17.8 | 17.1
Inventories, net | 17.8 | 17.1
Inventory, Net [Abstract] |  |
Raw materials | 38.5 | 28.1
Work in process | 26.0 | 20.7
Finished goods | 50.3 | 49.6
Supplies and other | 5.9 | 5.7
Inventory, gross | 120.7 | 104.1
Excess of FIFO or weighted-average cost over LIFO cost | (12.9) | (13.0)
Inventories | $ 107.8 | $ 91.1

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