Restructuring Activities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2012
Integration and optimization program [Member]
Restructuring Cost and Reserve [Line Items]
Expected completed date of restructuring program			Dec. 31, 2014
Asset impairment charges		$ 5
Amount of stock appreciation rights that were issued	37.5		110.6
Cumulative cash payments	86		86
Restructuring Expected Accrual to Pay	68		68
Restructuring Expected Accrual Remaining to Pay	7		7
Recognized associated costs	2.9		10.3
Integration and optimization program [Member] | Stock Appreciation Rights (SARs) [Member]
Restructuring Cost and Reserve [Line Items]
Amount of stock appreciation rights that were issued			8.0
European principal company [Member]
Restructuring Cost and Reserve [Line Items]
Recognized associated costs	$ 1.0		$ 12.0