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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Inventories [Abstract]    
Raw materials and supplies $ 141.0 $ 132.9
Work in process 31.2 27.7
Finished products 84.1 82.4
Inventory reserves (39.6) (38.1)
Total Inventory $ 216.7 $ 204.9