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INVENTORIES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Mar. 31, 2016
Dec. 31, 2015
Oct. 05, 2015
Mar. 31, 2015
Business Acquisition [Line Items]          
Supplies $ 39.2 $ 73.7 $ 86.5   $ 40.2
Raw materials 63.3 88.0 91.5   63.6
Work in process 31.8 108.1 105.8   37.2
Finished goods 141.5 452.2 445.3   141.1
Inventory, Gross 275.8 722.0 729.1   282.1
LIFO reserves (65.7) (42.5) (43.9)   (66.0)
Inventories $ 210.1 $ 679.5 $ 685.2   $ 216.1
Percentage of inventory using the last-in, first-out (LIFO) method of inventory accounting (in hundredths) 58.00%   49.00%    
Effect of LIFO Inventory Liquidation on Income $ 1.5        
DCP Business          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory       $ 477.1  
Initial Valuation [Member] | DCP Business          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory       $ 477.1