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RESTRUCTURING CHARGE (Detail Textuals) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 38 Months Ended 12 Months Ended 38 Months Ended 12 Months Ended 38 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2010
Dec. 09, 2010
T
Dec. 31, 2013
Chlor Alkali Products Segment [Member]
Dec. 31, 2012
Chlor Alkali Products Segment [Member]
Dec. 31, 2011
Chlor Alkali Products Segment [Member]
Dec. 31, 2010
Chlor Alkali Products Segment [Member]
Dec. 31, 2013
Chlor Alkali Products Segment [Member]
Dec. 31, 2013
Winchester Segment [Member]
Dec. 31, 2012
Winchester Segment [Member]
Dec. 31, 2011
Winchester Segment [Member]
Dec. 31, 2010
Winchester Segment [Member]
Dec. 31, 2013
Winchester Segment [Member]
Dec. 31, 2013
Minimum [Member]
Winchester Segment [Member]
Dec. 31, 2013
Maximum [Member]
Winchester Segment [Member]
Restructuring and Related Activities [Abstract]                                    
Previous mercury cell capacity tonnage at Charleston, TN facility (in tons)           260,000                        
Membrane capacity tonnage capacity at Charleston, TN facility (in tons)           200,000                        
Percentage reduction of electricity usage per ECU produced (in hundredths) 25.00%     25.00%                            
Tonnage reduction in chlor alkali manufacturing capacity (in tons)           160,000                        
Restructuring Cost and Reserve [Line Items]                                    
Restructuring charges $ 5.5 $ 8.5 $ 10.7 $ 58.9     $ 3.7 $ 2.3 $ 2.8 $ 28.0 $ 36.8 $ 1.8 $ 6.2 $ 7.0 $ 6.2 $ 22.1    
Additional restructuring and related expected cost             2         5            
Forecast to reduce Winchester's annual operating costs                                 35 40
Estimated five-year project cost for Winchester relocation                       110       110    
Estimated capital spending for Winchester relocation                       80       80    
Government Grants for Facility Relocation Capital Spending                           31        
Restructuring and Related Cost, Incurred Cost       20.4                            
Restructuring Reserve, Settled without Cash       28.3                            
Accrued Restructuring Costs $ 10.2 $ 13.9 $ 12.1 $ 10.2 $ 7.0