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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