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INVENTORIES (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Supplies $ 66.1 $ 58.1
Raw materials 75.3 72.6
Work in process 127.8 110.7
Finished goods 462.6 424.9
Inventory, gross 731.8 666.3
LIFO reserves (49.2) (35.9)
Inventories, net $ 682.6 $ 630.4
Percentage of inventory using the last-in, first-out (LIFO) method of inventory accounting (in hundredths) 55.00% 54.00%