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INVENTORIES (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Inventory Disclosure [Abstract]      
Supplies $ 59.7 $ 58.1 $ 60.9
Raw materials 74.9 72.6 82.1
Work in process 133.7 110.7 102.8
Finished goods 445.8 424.9 423.4
Inventory, gross 714.1 666.3 669.2
LIFO reserve (47.9) (35.9) (33.0)
Inventories, net $ 666.2 $ 630.4 $ 636.2