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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]      
Raw materials and supplies $ 116.0   $ 97.2
Work in process 33.7   37.3
Finished goods 83.8   74.4
Total inventories, net 233.5 $ 197.3 208.9
Inventory valuation reserve $ 8.7   $ 8.5