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INVENTORIES (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Inventory Disclosure [Abstract]      
Supplies $ 60.3 $ 58.1 $ 58.1
Raw materials 85.4 72.6 79.1
Work in process 120.6 110.7 114.7
Finished goods 470.7 424.9 405.9
Inventory, gross 737.0 666.3 657.8
LIFO reserve (47.5) (35.9) (40.8)
Inventories, net $ 689.5 $ 630.4 $ 617.0