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INVENTORIES (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Oct. 05, 2015
Mar. 31, 2015
Business Acquisition [Line Items]        
Supplies $ 73.7 $ 86.5   $ 40.2
Raw materials 88.0 91.5   63.6
Work in process 108.1 105.8   37.2
Finished goods 452.2 445.3   141.1
Inventory, gross 722.0 729.1   282.1
LIFO reserve (42.5) (43.9)   (66.0)
Inventories, net $ 679.5 $ 685.2   $ 216.1
DCP Business        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory     $ 477.1