Restructuring Charges - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended				3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Two Thousand Nine Restructuring Programs [Member]	Sep. 30, 2012 2012 Restructuring Program [Member]	Dec. 31, 2012 2012 Restructuring Program [Member]	Dec. 31, 2012 2012 Restructuring Program [Member] Company Restructuring Plan For Year Two [Member]	Dec. 31, 2012 2012 Restructuring Program [Member] Sales [Member]	Dec. 31, 2012 2012 Restructuring Program [Member] Cost of Sales [Member]	Dec. 31, 2012 2012 Restructuring Program [Member] Selling, General and Administrative Expenses [Member]	Dec. 31, 2012 2012 Restructuring Program [Member] Pension Curtailment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 20.7		$ (0.3)		$ 24.1	$ 24.1	$ 25.0	$ 1.6	$ 1.2	$ 0.6	$ 1.5
Settlement of restructuring charges				0.3		24.0
Cash paid for restructuring charges during the period	3.6	1.6	7.3			3.8
Additional charges expected to recognize in 2013						$ 1