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INVENTORIES (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Oct. 05, 2015
Sep. 30, 2015
Business Acquisition [Line Items]        
Supplies $ 58.1 $ 86.5   $ 45.7
Raw materials 79.1 91.5   67.9
Work in process 114.7 105.8   29.0
Finished goods 405.9 445.3   153.4
Inventory, gross 657.8 729.1   296.0
LIFO reserve (40.8) (43.9)   (63.5)
Inventories, net $ 617.0 $ 685.2   $ 232.5
DCP Business        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory     $ 456.4