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RESTRUCTURING CHARGES (Detail Textuals)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended 25 Months Ended 74 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Mar. 21, 2016
T
Dec. 12, 2014
T
Dec. 31, 2013
USD ($)
Dec. 31, 2011
USD ($)
Dec. 09, 2010
T
Restructuring Cost and Reserve [Line Items]                        
Restructuring charges     $ 112.9 $ 2.7 $ 15.7   $ 190.2          
Restructuring and Related Cost, Incurred Cost             67.6          
Restructuring Reserve, Settled without Cash             109.1          
Accrued Restructuring Costs $ 15.7 $ 12.7 12.7 6.7 15.7 $ 12.7 12.7     $ 10.2    
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   111.3 111.3                  
Additional restructuring and related expected cost   33.0 33.0     33.0 33.0          
Chlor Alkali Products Becancour                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring charges $ 10.0   0.8 2.0   12.8            
Additional restructuring and related expected cost   7.0 7.0     7.0 7.0          
Tonnage reduction in chlor alkali manufacturing capacity (in tons) | T                 185,000      
Chlor Alkali Products Mercury                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring charges         3.8   40.6          
Previous mercury cell capacity tonnage at Charleston, TN facility (in tons) | T                       260,000
Membrane capacity tonnage capacity at Charleston, TN facility (in tons) | T                       200,000
Winchester Segment                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring charges     0.8 $ 0.7 $ 1.9   25.5          
Estimated Project Cost For Plant Relocation   110.0 110.0     110.0 110.0          
Estimated Capital Spending For Facility Relocation   $ 80.0 $ 80.0     $ 80.0 $ 80.0          
Government Grants for Facility Relocation Capital Spending                     $ 31.0