RESTRUCTURING CHARGE (Details Textuals) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 47 Months Ended 3 Months Ended 9 Months Ended 47 Months Ended 3 Months Ended 9 Months Ended 47 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Chlor Alkali Products Segment
Sep. 30, 2013
Chlor Alkali Products Segment
Sep. 30, 2014
Chlor Alkali Products Segment
Sep. 30, 2013
Chlor Alkali Products Segment
Sep. 30, 2014
Chlor Alkali Products Segment
Dec. 09, 2010
Chlor Alkali Products Segment
T
Sep. 30, 2014
Winchester Segment
Sep. 30, 2013
Winchester Segment
Sep. 30, 2014
Winchester Segment
Sep. 30, 2013
Winchester Segment
Sep. 30, 2014
Winchester Segment
Dec. 31, 2011
Winchester Segment
Sep. 30, 2014
Winchester Segment
Minimum
Sep. 30, 2014
Winchester Segment
Maximum
Restructuring Cost and Reserve [Line Items]                                                  
Previous mercury cell capacity tonnage at Charleston, TN facility (in tons)                                 260,000                
Membrane capacity tonnage capability at Charleston, TN facility (in tons)                                 200,000                
Percentage reduction of electricity usage per ECU produced (in hundredths)                       25.00%   25.00%   25.00%                  
Product Segment Production Capacity Decrease                                 160,000                
Restructuring charges (credits) $ 1.2 $ 2.3 $ 1.0 $ 1.6 $ 0.2 $ 2.3 $ 4.5 $ 4.1 $ 63.4     $ 0.7 $ 1.3 $ 3.0 $ 2.7 $ 39.8   $ 0.5 $ 0.3 $ 1.5 $ 1.4 $ 23.6      
Restructuring And Related Cost Expected Cost                           1           3          
Forecast annual reduction of Winchester's annual operating costs                                               35 40
Estimated five-year project cost for Winchester relocation                                   110   110   110      
Estimated capital spending for Winchester relocation                                   80   80   80      
Government Grants for Facility Relocation Capital Spending                                             31    
Inception to date Amounts Utilized (cash)                 24.6                                
Inception to date Amounts Utilized (non-cash)                 28.6                                
Accrued restructuring costs $ 10.2     $ 10.8     $ 10.2 $ 10.8 $ 10.2 $ 10.2 $ 13.9