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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Inventories [Abstract]    
Raw materials and supplies $ 128.4 $ 132.9
Work in process 29.9 27.7
Finished products 78.1 82.4
Inventory reserves (34.5) (38.1)
Total Inventory $ 201.9 $ 204.9