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Inventories - Components of Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 317.9 $ 279.8
Work in process 14.9 12.6
Finished goods 180.4 217.0
Supplies and materials 267.4 253.1
Inventories $ 780.6 $ 762.5