Discontinued Operations - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of business	$ 29.2
Net cash proceeds from the sale of window and door profiles business			$ 26.8	$ (0.9)
Aromatics [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash received from business disposal			52.4
Business disposal, sale price			47.4
Advance toward the cost of decommissioning and dismantling business			5.0
Contingent consideration		$ 5.0
Working capital adjustment, net		0.2
Discontinued Operations Disposed of by Sale [Member] | Aromatics [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on business disposal		5.3	$ (25.1)
Contingent consideration		5.5
Discontinued Operations Disposed of by Sale [Member] | Window and Door Profiles Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on business disposal	(25.2)
Net cash proceeds from the sale of window and door profiles business	27.5
Discontinued Operations Disposed of by Sale [Member] | INEOS Americas LLC. [Member] | Aromatics [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Advance toward the cost of decommissioning and dismantling business		5.0
Decommissioning and dismantlement costs		$ 5.0
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Concord Ontario [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on the sale of assets	$ (4.0)