v3.5.0.2

Goodwill and Other Intangible Assets - Detail of the Definite-Lived Intangible Assets by Reportable Segment (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 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	(249.2)	(215.2)
Foreign currency translation adjustment	(20.1)	(24.7)
Net carrying amounts	978.4	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	(224.6)	(192.2)
Foreign currency translation adjustment	(20.1)	(24.6)
Net carrying amounts	958.2	986.1
Building Products [Member]
Goodwill [Line Items]
Gross carrying amounts	44.8	44.8
Accumulated amortization	(24.6)	(23.0)
Foreign currency translation adjustment		(0.1)
Net carrying amounts	20.2	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	(223.5)	(191.8)
Foreign currency translation adjustment	(20.1)	(24.7)
Net carrying amounts	923.2	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	(213.8)	(182.9)
Foreign currency translation adjustment	(20.1)	(24.6)
Net carrying amounts	905.5	931.9
Customer Relationships [Member] | Building Products [Member]
Goodwill [Line Items]
Gross carrying amounts	27.4	27.4
Accumulated amortization	(9.7)	(8.9)
Foreign currency translation adjustment		(0.1)
Net carrying amounts	17.7	18.4
Supply Contracts [Member]
Goodwill [Line Items]
Gross carrying amounts	42.6	42.6
Accumulated amortization	(7.3)	(6.3)
Net carrying amounts	35.3	36.3
Supply Contracts [Member] | Chlorovinyls [Member]
Goodwill [Line Items]
Gross carrying amounts	42.6	42.6
Accumulated amortization	(7.3)	(6.3)
Net carrying amounts	35.3	36.3
Technology [Member]
Goodwill [Line Items]
Gross carrying amounts	32.3	32.3
Accumulated amortization	(17.2)	(16.1)
Net carrying amounts	15.1	16.2
Technology [Member] | Chlorovinyls [Member]
Goodwill [Line Items]
Gross carrying amounts	14.9	14.9
Accumulated amortization	(2.3)	(2.0)
Net carrying amounts	12.6	12.9
Technology [Member] | Building Products [Member]
Goodwill [Line Items]
Gross carrying amounts	17.4	17.4
Accumulated amortization	(14.9)	(14.1)
Net carrying amounts	2.5	3.3
Trade Names [Member]
Goodwill [Line Items]
Gross carrying amounts	6.0	6.0
Accumulated amortization	(1.2)	(1.0)
Net carrying amounts	4.8	5.0
Trade Names [Member] | Chlorovinyls [Member]
Goodwill [Line Items]
Gross carrying amounts	6.0	6.0
Accumulated amortization	(1.2)	(1.0)
Net carrying amounts	$ 4.8	$ 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=66006027&loc=d3e16323-109275

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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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=66006027&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=66006027&loc=d3e16323-109275

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+ References

No definition available.

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X

- 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=66006027&loc=d3e16373-109275

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