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Supplemental Balance Sheet Information - Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Inventory, LIFO, Net [Abstract] |  |
Raw materials | $ 50.4 | $ 46.3
Work in process | 28.8 | 30.4
Finished goods | 53.4 | 49.5
Supplies and other | 0.0 | 0.0
Inventory, gross | 132.6 | 126.2
Excess of FIFO or weighted-average cost over LIFO cost | (6.9) | (9.9)
Inventories, net | 125.7 | 116.3
Inventory, Non-LIFO, Net [Abstract] |  |
Raw materials | 2.9 | 2.9
Work in process | 0.4 | 0.5
Finished goods | 20.1 | 21.7
Supplies and other | 4.0 | 4.5
Inventory, gross | 27.4 | 29.6
Inventories, net | 27.4 | 29.6
Inventory, Net [Abstract] |  |
Raw materials | 53.3 | 49.2
Work in process | 29.2 | 30.9
Finished goods | 73.5 | 71.2
Supplies and other | 4.0 | 4.5
Inventory, gross | 160.0 | 155.8
Excess of FIFO or weighted-average cost over LIFO cost | (6.9) | (9.9)
Inventories | $ 153.1 | $ 145.9

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