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Inventories - Components of Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 263.7 $ 271.9
Work in process 13.0 12.9
Finished goods 214.5 206.5
Supplies and materials 245.4 232.3
Inventories $ 736.6 $ 723.6