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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]      
Raw materials and supplies $ 109.4   $ 97.2
Work in process 36.0   37.3
Finished goods 77.7   74.4
Total inventories, net 223.1 $ 197.3 208.9
Inventory valuation reserve $ 8.7   $ 8.5