Restructuring Charges - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 21.0	$ 21.0
2012 Restructuring Programs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	24.1
Additional Expected Charges		1.0
Total Expected Restructuring Charges		25
Settlement of restructuring charges	23	23
2012 Restructuring Programs [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Additional Expected Charges	21.0
2012 Restructuring Programs [Member] | Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.6
2012 Restructuring Programs [Member] | Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.1
2012 Restructuring Programs [Member] | Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.4