GOODWILL AND OTHER INTANGIBLE ASSETS (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	$ 1,270.6		$ 1,270.6		$ 52.6
Accumulated amortization	(48.1)		(48.1)		(18.3)
Foreign currency translation adjustment			(4.3)
Net carrying amounts	1,218.2		1,218.2		34.3
Amortization expense for the definite-lived intangible assets	18.20	0.80	29.80	1.70
Total definite-lived intangible asset estimated annual amortization expense for the next five fiscal years
Year one	70.9		70.9
Year two	70.9		70.9
Year three	70.9		70.9
Year four	70.9		70.9
Year five	70.9		70.9
Customer relationships
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	1,232.3		1,232.3		35.2
Accumulated amortization	(37.3)		(37.3)		(8.7)
Foreign currency translation adjustment			(4.3)
Net carrying amounts	1,190.7		1,190.7		26.5
Customer relationships | Weighted average
Changes made to finite-lived intangible assets by reportable segment
Weighted average estimated useful life			18 years
Technology
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	32.3		32.3		17.4
Accumulated amortization	(10.7)		(10.7)		(9.6)
Net carrying amounts	21.6		21.6		7.8
Technology | Weighted average
Changes made to finite-lived intangible assets by reportable segment
Weighted average estimated useful life			16 years
Definite-lived trade names
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	6.0		6.0
Accumulated amortization	(0.1)		(0.1)
Net carrying amounts	5.9		5.9
Definite-lived trade names | Weighted average
Changes made to finite-lived intangible assets by reportable segment
Weighted average estimated useful life			17 years
Chlorovinyls
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	1,218.0		1,218.0		0
Accumulated amortization	(28.1)		(28.1)
Foreign currency translation adjustment			(4.3)
Net carrying amounts	1,185.6		1,185.6
Chlorovinyls | Customer relationships
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	1,197.1		1,197.1
Accumulated amortization	(27.7)		(27.7)
Foreign currency translation adjustment			(4.3)
Net carrying amounts	1,165.1		1,165.1
Chlorovinyls | Technology
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	14.9		14.9
Accumulated amortization	(0.3)		(0.3)
Net carrying amounts	14.6		14.6
Chlorovinyls | Definite-lived trade names
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	6.0		6.0
Accumulated amortization	(0.1)		(0.1)
Net carrying amounts	5.9		5.9
Building Products
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	52.6		52.6		52.6
Accumulated amortization	(20.0)		(20.0)		(18.3)
Net carrying amounts	32.6		32.6		34.3
Building Products | Customer relationships
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	35.2		35.2		35.2
Accumulated amortization	(9.6)		(9.6)		(8.7)
Net carrying amounts	25.6		25.6		26.5
Building Products | Technology
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	17.4		17.4		17.4
Accumulated amortization	(10.4)		(10.4)		(9.6)
Net carrying amounts	7.0		7.0		7.8
Aromatics
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	$ 0		$ 0		$ 0