GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015 segment	Dec. 31, 2014
GOODWILL AND OTHER INTANGIBLE ASSETS
Number of segments that contain reporting units with goodwill and intangible assets	2
Changes made to goodwill by reportable segment
Gross goodwill at the beginning of the period	$ 1,951.0us-gaap_GoodwillGross
Foreign currency translation adjustment	(9.7)us-gaap_GoodwillTranslationAdjustments
Gross goodwill at the end of the period	1,941.3us-gaap_GoodwillGross
Accumulated impairment losses at the end of the period	(210.0)	(210.0)
Net goodwill at the end of the period	1,731.3us-gaap_Goodwill	1,741.0us-gaap_Goodwill
Trade names
Changes made to goodwill by reportable segment
Indefinite-lived intangible assets, net of cumulative translation adjustment	5.9	6.0
Chlorovinyls
Changes made to goodwill by reportable segment
Gross goodwill at the beginning of the period	1,790.8
Foreign currency translation adjustment	(9.7)
Gross goodwill at the end of the period	1,781.1
Accumulated impairment losses at the end of the period	(59.6)	(59.6)
Net goodwill at the end of the period	1,721.5	1,731.2
Building Products
Changes made to goodwill by reportable segment
Gross goodwill at the beginning of the period		160.2
Gross goodwill at the end of the period	160.2	160.2
Accumulated impairment losses at the end of the period	(150.4)	(150.4)
Net goodwill at the end of the period	$ 9.8	$ 9.8

Represents the number of segments that contain reporting units with goodwill and intangible assets.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 20

-Section 50

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Name Accounting Standards Codification

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Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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-Publisher FASB

-Name Accounting Standards Codification

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