Restructuring Of Operations (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended		12 Months Ended		3 Months Ended		6 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended	3 Months Ended		12 Months Ended			6 Months Ended	12 Months Ended						3 Months Ended		12 Months Ended		6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2012 2010 Restructuring Initiatives	Mar. 31, 2012 2010 Restructuring Initiatives	Jun. 30, 2012 2010 Restructuring Initiatives	Dec. 31, 2011 2010 Restructuring Initiatives	Dec. 31, 2010 2010 Restructuring Initiatives	May 31, 2010 2010 Restructuring Initiatives Mt. Pleasant, Tennessee Facility In-Process Separation Segment	Dec. 31, 2011 2010 Restructuring Initiatives Mt. Pleasant, Tennessee Facility In-Process Separation Segment	Jun. 30, 2012 2009 Restructuring Initiatives	Mar. 31, 2012 2009 Restructuring Initiatives	Dec. 31, 2011 2009 Restructuring Initiatives	Dec. 31, 2009 2009 Restructuring Initiatives	Dec. 31, 2010 2009 Restructuring Initiatives	Jun. 30, 2012 2009 Restructuring Initiatives Manufacturing Locations In Process Separation And Additive Technologies	Dec. 31, 2010 2009 Restructuring Initiatives Manufacturing Locations In Process Separation And Additive Technologies	Dec. 31, 2009 2009 Restructuring Initiatives Manufacturing Locations In Process Separation And Additive Technologies Person	Dec. 31, 2010 2009 Restructuring Initiatives Engineered Materials Segment	Dec. 31, 2009 2009 Restructuring Initiatives Engineered Materials Segment	Dec. 31, 2010 2009 Restructuring Initiatives Corporate Functions In Process Separation And Additive Technologies	Dec. 31, 2009 2009 Restructuring Initiatives Corporate Functions In Process Separation And Additive Technologies Person	Jun. 30, 2012 2012 Restructuring Initiatives	Mar. 31, 2012 2012 Restructuring Initiatives	Dec. 31, 2011 2012 Restructuring Initiatives	Dec. 31, 2010 2012 Restructuring Initiatives	Jun. 30, 2012 2012 Restructuring Initiatives Coating Resins Segment Person
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 10.8	$ 0.2		$ 10.8		$ 0.5	$ 3.0	$ 0	$ 0.1	$ 0	$ 0.3	$ 1.5			$ 0.1	$ 0.1	$ 0.2		$ 1.5								$ 10.7	$ 0	$ 0	$ 0	$ 11.6
Number of positions eliminated													10									43		230		208					158
Restructuring charge	11.5	(0.1)	0.3	11.4	0.4	0.8		(0.1)	(0.1)		1.1		5.5		0	0	(0.3)	13.6		4.0							11.6	0	0
Severance cost													0.4											3.6		6.0
Write-down of manufacturing assets													1.7
Additional costs													3.4
Restructuring charge, adjustment related to restructuring initiatives										$ 0.2				$ 1.1			$ 0.3				$ 0.2		$ 0.4		$ 0.8