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Components of Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Inventory, Finished Goods and Work in Process, Net of Reserves [Abstract]    
Raw materials and supplies $ 81.7 $ 84.4
Work in process 36.1 34.1
Finished goods 281.7 264.3
Total $ 399.5 $ 382.8