SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) item segment	Jun. 30, 2014 USD ($)
Segment information
Number of reportable segments \| segment			3
Segment information
Total net sales	$ 1,058.4	$ 1,236.9	$ 2,006.0	$ 2,230.6
Operating income (loss)	42.8	58.4	58.4	58.0
Interest expense, net	(19.5)	(19.1)	(38.3)	(37.4)
Debt refinancing costs			(3.2)
Foreign exchange gain (loss)	(0.3)	(0.3)	(0.5)	0.1
Consolidated income before income taxes	23.0	39.0	16.4	20.7
Operating segments
Segment information
Total net sales	1,058.4	1,236.9	2,006.0	2,230.6
Chlorovinyls
Segment information
Total net sales	666.1	777.9	1,314.5	1,460.1
Operating income (loss)	37.8	66.6	81.6	89.9
Chlorovinyls \| Operating segments
Segment information
Total net sales	727.2	845.7	1,431.7	1,579.8
Chlorovinyls \| Intersegment eliminations
Segment information
Total net sales	61.1	67.8	$ 117.2	119.7
Building Products
Segment information
Number of primary product groups \| item			2
Segment information
Total net sales	250.3	243.8	$ 416.7	398.5
Operating income (loss)	22.6	14.2	12.3	3.4
Building Products \| Operating segments
Segment information
Total net sales	250.3	243.8	416.7	398.5
Aromatics
Segment information
Total net sales	142.0	215.2	274.8	372.0
Operating income (loss)	0.4	(7.4)	0.7	(2.9)
Aromatics \| Operating segments
Segment information
Total net sales	142.0	215.2	274.8	372.0
Eliminations, Unallocated and Other
Segment information
Operating income (loss)	(18.0)	(15.0)	(36.2)	(32.4)
Eliminations, Unallocated and Other \| Operating segments
Segment information
Total net sales	(61.1)	(67.8)	(117.2)	(119.7)
Eliminations, Unallocated and Other \| Intersegment eliminations
Segment information
Total net sales	$ (61.1)	$ (67.8)	$ (117.2)	$ (119.7)

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