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Inventories - Components of Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 280.2 $ 307.8
Work in process 15.8 13.9
Finished goods 215.8 199.0
Supplies and materials 294.5 274.9
Inventories $ 806.3 $ 795.6