SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segment item	Sep. 30, 2014 USD ($)
Segment information
Number of reportable segments \| segment			2
Segment information
Total net sales	$ 874.4	$ 1,047.2	$ 2,605.7	$ 2,905.8
Operating income (loss)	(811.3)	72.2	(753.5)	133.1
Interest expense, net	(19.6)	(19.5)	(57.9)	(56.9)
Debt refinancing costs			(3.2)
Foreign exchange loss	(0.5)	(0.3)	(1.0)	(0.2)
Income (loss) from continuing operations before income taxes	(831.4)	52.4	(815.6)	76.0
Eliminations, Unallocated and Other
Segment information
Total net sales	(60.0)	(75.4)	(177.4)	(195.1)
Operating income (loss)	(19.4)	(21.4)	$ (55.5)	(53.8)
Building Products
Segment information
Number of primary product groups \| item			2
Segment information
Total net sales	248.0	277.8	$ 664.8	676.3
Building Products \| Operating Segments
Segment information
Total net sales	248.0	277.8	664.8	676.3
Operating income (loss)	20.2	24.0	32.5	27.4
Chlorovinyls
Segment information
Total net sales	626.4	769.4	1,940.9	2,229.5
Chlorovinyls \| Operating Segments
Segment information
Total net sales	686.4	844.8	2,118.3	2,424.6
Operating income (loss)	(812.1)	69.6	(730.5)	159.5
Chlorovinyls \| Intersegment Elimination
Segment information
Total net sales	$ 60.0	$ 75.4	$ 177.4	$ 195.1

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