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Supplemental Balance Sheet Information - Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
LIFO |  |
Raw Materials | $ 26.6 | $ 24.5
Work in process | 20.4 | 16.2
Finished goods | 40.0 | 37.1
Supplies and other | 0.0 | 0.0
Inventories, gross | 87.0 | 77.8
Excess of FIFO or weighted-average cost over LIFO cost | (13.0) | (12.0)
Inventories, net | 74.0 | 65.8
Non- LIFO |  |
Raw Materials | 1.5 | 0.8
Work in process | 0.3 | 0.1
Finished goods | 9.6 | 8.2
Supplies and other | 5.7 | 5.8
Inventories, gross | 17.1 | 14.9
Inventories, net | 17.1 | 14.9
Total |  |
Raw Materials | 28.1 | 25.3
Work in process | 20.7 | 16.3
Finished goods | 49.6 | 45.3
Supplies and other | 5.7 | 5.8
Inventories, gross | 104.1 | 92.7
Excess of FIFO or weighted-average cost over LIFO cost | (13.0) | (12.0)
Inventories | $ 91.1 | $ 80.7

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