GOODWILL, OTHER INTANGIBLE ASSETS AND RESTRUCTURING (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	$ 1,255.4	$ 1,255.4		$ 1,255.4
Accumulated impairment charges	(2.6)
Accumulated amortization:	(152.0)	(82.7)		(152.0)
Foreign currency translation adjustment:	(14.2)	(4.0)
Net carrying amounts	1,086.6us-gaap_FiniteLivedIntangibleAssetsNet	1,168.7us-gaap_FiniteLivedIntangibleAssetsNet		1,086.6us-gaap_FiniteLivedIntangibleAssetsNet
Amortization expense for the definite-lived intangible assets	69.6us-gaap_AmortizationOfIntangibleAssets	64.3us-gaap_AmortizationOfIntangibleAssets	3.3us-gaap_AmortizationOfIntangibleAssets
Total definite-lived intangible asset estimated annual amortization expense for the next five fiscal years
Year one	67.0			67.0
Year two	67.0			67.0
Year three	67.0			67.0
Year four	67.0			67.0
Year five	67.0			67.0
Customer relationships
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	1,174.5	1,174.5		1,174.5
Accumulated amortization:	(133.2)	(68.7)		(133.2)
Foreign currency translation adjustment:	(14.2)	(4.0)
Net carrying amounts	1,024.5	1,101.8		1,024.5
Customer relationships \| Weighted average
Changes made to finite-lived intangible assets by reportable segment
Weighted average estimated useful life	16 years
Supply contracts
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	42.6	42.6		42.6
Accumulated amortization:	(4.1)	(2.0)		(4.1)
Net carrying amounts	38.5	40.6		38.5
Supply contracts \| Weighted average
Changes made to finite-lived intangible assets by reportable segment
Weighted average estimated useful life	18 years
Trade names
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	6.0	6.0		6.0
Accumulated amortization:	(0.7)	(0.3)		(0.7)
Net carrying amounts	5.3	5.7		5.3
Trade names \| Weighted average
Changes made to finite-lived intangible assets by reportable segment
Weighted average estimated useful life	15 years
Technology
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	32.3	32.3		32.3
Accumulated amortization:	(14.0)	(11.7)		(14.0)
Net carrying amounts	18.3	20.6		18.3
Technology \| Weighted average
Changes made to finite-lived intangible assets by reportable segment
Weighted average estimated useful life	16 years
Chlorovinyls
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	1,205.8	1,205.8		1,205.8
Accumulated impairment charges	(2.6)
Accumulated amortization:	(127.2)	(61.1)		(127.2)
Foreign currency translation adjustment:	(14.2)	(4.0)
Net carrying amounts	1,061.8	1,140.7		1,061.8
Chlorovinyls \| Customer relationships
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	1,142.3	1,142.3		1,142.3
Accumulated impairment charges				(2.6)
Accumulated amortization:	(121.1)	(58.2)		(121.1)
Foreign currency translation adjustment:	(14.2)	(4.0)
Net carrying amounts	1,004.4	1,080.1		1,004.4
Chlorovinyls \| Supply contracts
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	42.6	42.6		42.6
Accumulated amortization:	(4.1)	(2.0)		(4.1)
Net carrying amounts	38.5	40.6		38.5
Chlorovinyls \| Trade names
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	6.0	6.0		6.0
Accumulated amortization:	(0.7)	(0.3)		(0.7)
Net carrying amounts	5.3	5.7		5.3
Chlorovinyls \| Technology
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	14.9	14.9		14.9
Accumulated amortization:	(1.3)	(0.6)		(1.3)
Net carrying amounts	13.6	14.3		13.6
Building Products
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	49.6	49.6		49.6
Accumulated amortization:	(24.8)	(21.6)		(24.8)
Net carrying amounts	24.8	28.0		24.8
Total definite-lived intangible asset estimated annual amortization expense for the next five fiscal years
Restructuring charge	6.3	3.2
Expected restructuring charges in 2014 and 2015	1.9			1.9
Building Products \| Customer relationships
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	32.2	32.2		32.2
Accumulated amortization:	(12.1)	(10.5)		(12.1)
Net carrying amounts	20.1	21.7		20.1
Building Products \| Technology
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	17.4	17.4		17.4
Accumulated amortization:	(12.7)	(11.1)		(12.7)
Net carrying amounts	4.7	6.3		4.7
Aromatics
Changes made to finite-lived intangible assets by reportable segment
Gross carrying amounts	$ 0	$ 0		$ 0

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Name:	us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References