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.

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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.

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Goodwill - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Goodwill [Line Items]
Beginning Balance	$ 400.1us-gaap_Goodwill	$ 379.7us-gaap_Goodwill	$ 379.7us-gaap_Goodwill
Sale of discontinued operations	(14.3)
Goodwill impairment	(6.4)us-gaap_GoodwillImpairmentLoss
Changes in foreign exchange rates	0.3us-gaap_GoodwillTranslationAdjustments
Ending Balance	379.7us-gaap_Goodwill	379.7us-gaap_Goodwill	379.7us-gaap_Goodwill
Chemicals
Goodwill [Line Items]
Beginning Balance		352.6	352.6	352.6
Ending Balance	352.6	352.6	352.6	352.6
Component Products
Goodwill [Line Items]
Beginning Balance	41.1	27.1	27.1
Sale of discontinued operations	(14.3)
Changes in foreign exchange rates	0.3
Ending Balance	27.1	27.1	27.1
EWI
Goodwill [Line Items]
Beginning Balance	6.4
Goodwill impairment	$ (6.4)