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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