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Components of Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Inventory, Finished Goods and Work in Process, Net of Reserves [Abstract]    
Raw materials and supplies $ 85.7 $ 85.6
Work in process 33.2 30.8
Finished goods 271.7 214.3
Total $ 390.6 $ 330.7