Restructuring Of Operations (Aggregate Pre-Tax Restructuring Charges (Credits) In Consolidated Statements Of Income) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	$ 11.5	$ (0.1)	$ 0.3	$ 11.4	$ 0.4	$ 0.8
Manufacturing Cost Of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	2.4		0.4	2.3	0.5
Selling And Technical Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	0.5		0	0.5	0
Research And Process Development [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	0.5		0	0.5	0
Administrative And General [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	$ 8.1		$ (0.1)	$ 8.1	$ (0.1)