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INVENTORIES (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Inventory Disclosure [Abstract]      
Supplies $ 60.1 $ 58.1 $ 73.7
Raw materials 68.9 72.6 88.0
Work in process 115.0 110.7 108.1
Finished goods 448.3 424.9 452.2
Inventory, gross 692.3 666.3 722.0
LIFO reserve (36.0) (35.9) (42.5)
Inventories, net $ 656.3 $ 630.4 $ 679.5