Fair Value of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified							3 Months Ended		9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Other Accounts Receivable	Dec. 31, 2012 Other Accounts Receivable	Sep. 30, 2013 Accrued Expenses	Dec. 31, 2012 Accrued Expenses	Sep. 30, 2013 Other income (expenses), net	Sep. 30, 2012 Other income (expenses), net	Sep. 30, 2013 Other income (expenses), net	Sep. 30, 2012 Other income (expenses), net	Sep. 30, 2013 Other, net	Sep. 30, 2012 Other, net
Fair Value, Option, Quantitative Disclosures [Line Items]
Foreign currency forward contracts, notional values	$ 255.9	$ 274.0
Fair value foreign currency forward contracts, assets			0.1	0.3
Fair value of foreign currency forward contracts, liabilities					0.1	0.8
Recognized gains (losses) of foreign currency forward contracts							0.4	3.0	(1.8)	(1.1)
Change in the fair value of foreign currency forward contracts											1.8	1.1
Cash settlements											$ (2.2)	$ (1.6)