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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
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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 |  |  |  |  |  |  |  |  |  |  |  |  |

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