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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]      
Raw materials and supplies $ 86.7   $ 72.1
Work in process 32.5   37.1
Finished goods 69.0   64.5
Total inventories, net 188.2 $ 162.1 173.7
Inventory valuation reserve $ 7.5   $ 7.1