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Components of Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventory, Finished Goods and Work in Process, Net of Reserves [Abstract]    
Raw materials and supplies $ 85.6 $ 69.8
Work in process 30.8 28.8
Finished goods 214.3 159.6
Total $ 330.7 $ 258.2