Segment Information - Schedule of Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 699.2	$ 784.6
Operating income (loss)	(35.2)	22.1
Interest expense, net	(17.0)	(17.6)
Debt refinancing costs		3.2
Foreign exchange loss	(0.9)	(0.7)
Income from continuing operations before income taxes	(53.1)	0.6
Chlorovinyls [Member]
Segment Reporting Information [Line Items]
Net sales	556.1	648.4
Operating income (loss)	(9.6)
Building Products [Member]
Segment Reporting Information [Line Items]
Net sales	143.1	136.2
Operating income (loss)	4.1
Intersegment Elimination [Member] \| Chlorovinyls [Member]
Segment Reporting Information [Line Items]
Net sales	55.3	56.1
Intersegment Elimination [Member] \| Building Products [Member]
Segment Reporting Information [Line Items]
Net sales	0.1
Intersegment Eliminations Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Net sales	(55.4)	(56.1)
Operating income (loss)	(29.7)	(18.2)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	699.2	784.6
Operating income (loss)	(35.2)
Operating Segments [Member] \| Chlorovinyls [Member]
Segment Reporting Information [Line Items]
Net sales	611.4	704.5
Operating income (loss)		43.7
Operating Segments [Member] \| Building Products [Member]
Segment Reporting Information [Line Items]
Net sales	$ 143.2	136.2
Operating income (loss)		$ (3.4)

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 25
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 10
-Article 5

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The net amount of nonoperating interest income (expense).

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The net result for the period of deducting operating expenses from operating revenues.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
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-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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