Goodwill - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended							12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2013 Chemicals	Dec. 31, 2012 Chemicals	Dec. 31, 2011 Chemicals	Dec. 31, 2010 Chemicals	Dec. 31, 2012 Component Products	Dec. 31, 2011 Component Products	Dec. 31, 2013 Component Products	Dec. 31, 2012 EWI	Dec. 31, 2010 EWI
Goodwill [Line Items]
Beginning Balance	$ 400.1	$ 397.4	$ 379.7	$ 352.6	$ 352.6	$ 352.6	$ 352.6	$ 41.1	$ 38.4	$ 27.1	$ 6.4	$ 6.4
Changes in foreign exchange rates	0.3	(0.4)						0.3	(0.4)
Goodwill acquired		3.1							3.1
Ending Balance	379.7	400.1	379.7	352.6	352.6	352.6	352.6	27.1	41.1	27.1		6.4
Sale of discontinued operations	(14.3)							(14.3)
Goodwill impairment	$ (6.4)										$ (6.4)