Restructuring Of Operations (Components Of Restructuring Initiatives) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended		12 Months Ended	3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended		12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 2009 Restructuring Initiatives	Mar. 31, 2012 2009 Restructuring Initiatives	Dec. 31, 2011 2009 Restructuring Initiatives	Dec. 31, 2009 2009 Restructuring Initiatives	Jun. 30, 2012 2010 Restructuring Initiatives	Mar. 31, 2012 2010 Restructuring Initiatives	Dec. 31, 2011 2010 Restructuring Initiatives	Jun. 30, 2012 2011 Restructuring Initiatives	Mar. 31, 2012 2011 Restructuring Initiatives	Dec. 31, 2011 2011 Restructuring Initiatives	Jun. 30, 2012 2012 Restructuring Initiatives	Mar. 31, 2012 2012 Restructuring Initiatives	Dec. 31, 2011 2012 Restructuring Initiatives
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	$ 0.2	$ 0.5		$ 0.5	$ 3.0	$ 3.0	$ 0.1	$ 0.2	$ 1.5		$ 0.1	$ 0.3	$ 1.5	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Restructuring charges (credits)	11.5	(0.1)	0.3	11.4	0.4	0.8	0	0	(0.3)	13.6	(0.1)	(0.1)	1.1	0	0	0	11.6	0	0
Non-cash items	0	0				0	0	0	0		0	0	0	0	0	0	0	0	0
Cash payments	(0.9)	(0.2)				(3.3)	0	(0.1)	(1.0)		0	(0.1)	(2.3)	0	0	0	(0.9)	0	0
Currency translation adjustments	0	0				0	0	0	0		0	0	0	0	0	0	0	0	0
Restructuring reserve, ending balance	$ 10.8	$ 0.2		$ 10.8		$ 0.5	$ 0.1	$ 0.1	$ 0.2		$ 0	$ 0.1	$ 0.3	$ 0	$ 0	$ 0	$ 10.7	$ 0	$ 0