v3.4.0.3

Goodwill and Other Intangible Assets - Detail of the Definite-Lived Intangible Assets by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Gross carrying amounts	$ 1,250.6	$ 1,250.6
Accumulated impairment charges	(2.9)	(2.9)
Accumulated amortization	(232.1)	(215.2)
Foreign currency translation adjustment	(20.3)	(24.7)
Net carrying amounts	995.3	1,007.8
Chlorovinyls [Member]
Goodwill [Line Items]
Gross carrying amounts	1,205.8	1,205.8
Accumulated impairment charges	(2.9)	(2.9)
Accumulated amortization	(208.3)	(192.2)
Foreign currency translation adjustment	(20.3)	(24.6)
Net carrying amounts	974.3	986.1
Building Products [Member]
Goodwill [Line Items]
Gross carrying amounts	44.8	44.8
Accumulated amortization	(23.8)	(23.0)
Foreign currency translation adjustment		(0.1)
Net carrying amounts	21.0	21.7
Customer Relationships [Member]
Goodwill [Line Items]
Gross carrying amounts	1,169.7	1,169.7
Accumulated impairment charges	(2.9)	(2.9)
Accumulated amortization	(207.6)	(191.8)
Foreign currency translation adjustment	(20.3)	(24.7)
Net carrying amounts	938.9	950.3
Customer Relationships [Member] | Chlorovinyls [Member]
Goodwill [Line Items]
Gross carrying amounts	1,142.3	1,142.3
Accumulated impairment charges	(2.9)	(2.9)
Accumulated amortization	(198.3)	(182.9)
Foreign currency translation adjustment	(20.3)	(24.6)
Net carrying amounts	920.8	931.9
Customer Relationships [Member] | Building Products [Member]
Goodwill [Line Items]
Gross carrying amounts	27.4	27.4
Accumulated amortization	(9.3)	(8.9)
Foreign currency translation adjustment		(0.1)
Net carrying amounts	18.1	18.4
Supply Contracts [Member]
Goodwill [Line Items]
Gross carrying amounts	42.6	42.6
Accumulated amortization	(6.8)	(6.3)
Net carrying amounts	35.8	36.3
Supply Contracts [Member] | Chlorovinyls [Member]
Goodwill [Line Items]
Gross carrying amounts	42.6	42.6
Accumulated amortization	(6.8)	(6.3)
Net carrying amounts	35.8	36.3
Technology [Member]
Goodwill [Line Items]
Gross carrying amounts	32.3	32.3
Accumulated amortization	(16.6)	(16.1)
Net carrying amounts	15.7	16.2
Technology [Member] | Chlorovinyls [Member]
Goodwill [Line Items]
Gross carrying amounts	14.9	14.9
Accumulated amortization	(2.1)	(2.0)
Net carrying amounts	12.8	12.9
Technology [Member] | Building Products [Member]
Goodwill [Line Items]
Gross carrying amounts	17.4	17.4
Accumulated amortization	(14.5)	(14.1)
Net carrying amounts	2.9	3.3
Trade Names [Member]
Goodwill [Line Items]
Gross carrying amounts	6.0	6.0
Accumulated amortization	(1.1)	(1.0)
Net carrying amounts	4.9	5.0
Trade Names [Member] | Chlorovinyls [Member]
Goodwill [Line Items]
Gross carrying amounts	6.0	6.0
Accumulated amortization	(1.1)	(1.0)
Net carrying amounts	$ 4.9	$ 5.0

X

- 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

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- Definition

Amount before 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

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- Definition

Amount after 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

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- Definition

Amount of increase (decrease) to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for foreign currency translation adjustments.

+ References

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275

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