SEGMENT INFORMATION (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 segment	Mar. 31, 2012
Segment information
Number of reportable segments	3
Segment information
Net sales	$ 1,061.2	$ 859.9
Total net sales	1,061.2	859.9
Transaction related costs and other, net	10.1	5.3
Long-lived asset impairment charges (recoveries), net	2.6	(0.3)
Gain on sale of assets		(17.4)
Operating income (loss)	71.2	68.2
Depreciation and amortization	42.3	22.6
Capital expenditures	16.4	13.5
Chlorovinyls
Segment information
Net sales	614.5	329.5
Intersegment revenues	58.5	67.6
Total net sales	673.0	397.1
Transaction related costs and other, net	1.3
Gain on sale of assets		(17.4)
Operating income (loss)	91.3	51.9
Depreciation and amortization	31.5	11.1
Capital expenditures	11.3	5.8
Building Products
Segment information
Number of primary product groups	2
Segment information
Net sales	162.2	187.2
Intersegment revenues		0.2
Total net sales	162.2	187.4
Transaction related costs and other, net	(0.3)	0.1
Long-lived asset impairment charges (recoveries), net	2.6	(0.3)
Operating income (loss)	(13.8)	(6.4)
Depreciation and amortization	8.8	10.0
Capital expenditures	4.1	5.9
Aromatics
Segment information
Net sales	284.5	343.2
Total net sales	284.5	343.2
Operating income (loss)	13.0	37.5
Depreciation and amortization	0.3	0.4
Capital expenditures	0.2	0.2
Eliminations, Unallocated and Other
Segment information
Intersegment revenues	(58.5)	(67.8)
Total net sales	(58.5)	(67.8)
Transaction related costs and other, net	9.1	5.2
Operating income (loss)	(19.3)	(14.8)
Depreciation and amortization	1.7	1.1
Capital expenditures	$ 0.8	$ 1.6