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SEGMENT INFORMATION (Details 1) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 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 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 | 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 Chemical Distribution [Member] | Dec. 31, 2012 Chemical Distribution [Member] | Dec. 31, 2011 Chemical Distribution [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 Corporate/Other [Member] | Dec. 31, 2012 Corporate/Other [Member] | Dec. 31, 2011 Corporate/Other [Member] | Dec. 31, 2013 Intersegment Elimination [Member] | Dec. 31, 2012 Intersegment Elimination [Member] | Dec. 31, 2011 Intersegment Elimination [Member]
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Synergies Transferred Between Segments |  |  |  |  |  |  |  |  | $ 11.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | 562.1 | 670.7 | 652.2 | 630.0 | 587.6 | 581.2 | 508.7 | 507.2 | 2,515.0 | 2,184.7 | 1,961.1 |  | 1,412.3 | 1,428.9 | 1,389.1 |  |  | 406.4 | 156.3 | 0 | 777.6 | 617.6 | 572.0 |  |  |  |  |  | (81.3) | (18.1) | 0
Income before taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income before taxes by segment |  |  |  |  |  |  |  |  | 250.0 | 225.2 | 379.4 |  | 203.8 | 263.2 | 245.0 |  |  | 9.7 | 4.5 | 0 | 143.2 | 55.2 | 37.9 |  |  | (62.6) | (51.8) | (46.7) |  |  |
Restructuring charge |  |  |  |  |  |  |  |  | (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) |  |  |  |  |  |
Acquisition costs |  |  |  |  |  |  |  |  | 0 | (8.3) | (0.8) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 0.7 | 7.6 | 8.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (38.6) | (26.4) | (30.4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 0.6 | 1.0 | 1.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other (expense) income |  |  |  |  |  |  |  |  | (1.3) | (11.3) | 175.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings of non-consolidated affiliates [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total earnings of non-consolidated affiliates |  |  |  |  |  |  |  |  | 2.8 | 3.0 | 9.6 |  | 2.8 | 3.0 | 9.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization expense |  |  |  |  |  |  |  |  | 135.3 | 110.9 | 99.3 |  | 102.1 | 88.9 | 85.6 |  |  | 15.4 | 5.5 | 0 | 14.9 | 13.6 | 10.9 |  |  | 2.9 | 2.9 | 2.8 |  |  |
Capital spending [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital spending |  |  |  |  |  |  |  |  | 90.8 | 255.7 | 200.9 |  | 65.5 | 221.3 | 134.2 |  |  | 2.5 | 0.8 | 0 | 21.2 | 32.1 | 63.9 |  |  | 1.6 | 1.5 | 2.8 |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 2,802.8 |  |  |  | 2,777.7 |  |  |  | 2,802.8 | 2,777.7 |  | 2,802.8 | 1,695.8 | 1,781.8 |  |  | 1,695.8 | 335.3 | 379.7 |  | 339.2 | 340.7 |  |  | 339.2 | 432.5 | 275.5 |  |  |  |
Investments-Affiliated Companies (at equity) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in non-consolidated affiliates | $ 21.6 |  |  |  | $ 29.3 |  |  |  | $ 21.6 | $ 29.3 |  | $ 21.6 | $ 21.6 | $ 29.3 |  |  | $ 21.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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