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RESTRUCTURING CHARGES (Details Textuals)
 3 Months Ended 12 Months Ended 28 Months Ended 77 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 21, 2016
T
Dec. 31, 2015
USD ($)
Dec. 12, 2014
T
Dec. 31, 2011
USD ($)
Restructuring Cost and Reserve [Line Items]                    
Restructuring charges $ 8,200,000 $ 92,800,000     $ 157,800,000          
Inception to date Amounts Utilized (cash)         58,000,000          
Inception to date Amounts Utilized (non-cash)         84,600,000          
Accrued restructuring costs 14,400,000 20,500,000 $ 14,400,000 $ 14,400,000 14,400,000 $ 12,700,000   $ 6,700,000    
Chlor Alkali Products and Vinyls Capacity Reductions                    
Restructuring Cost and Reserve [Line Items]                    
Total Product Segment Production Capacity Decrease | T             433,000      
Henderson Product Segment Production Capacity Decrease | T             153,000      
Niagara Product Segment Production Capacity | T             300,000      
Reduced Niagara Segment Production Capacity | T             240,000      
Freeport Product Segment Production Capacity Decrease | T             220,000      
Restructuring charges 7,500,000 92,200,000 118,800,000              
Additional restructuring and related expected cost 25,000,000   25,000,000 25,000,000 25,000,000          
Chlor Alkali Products Becancour                    
Restructuring Cost and Reserve [Line Items]                    
Restructuring charges 700,000 300,000   13,500,000            
Additional restructuring and related expected cost 6,000,000   6,000,000 6,000,000 6,000,000          
Tonnage reduction in chlor alkali manufacutring capactiy (in tons) | T                 185,000  
Winchester Segment                    
Restructuring Cost and Reserve [Line Items]                    
Restructuring charges   $ 300,000     25,500,000          
Estimated Project Cost For Plant Relocation 110,000,000   110,000,000 110,000,000 110,000,000          
Estimated Capital Spending For Facility Relocation $ 80,000,000   $ 80,000,000 $ 80,000,000 $ 80,000,000          
Government Grants for Facility Relocation Capital Spending                   $ 31,000,000