Fair Value of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified						3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Other Accounts Receivable	Dec. 31, 2012 Other Accounts Receivable	Dec. 31, 2012 Accrued Expenses	Mar. 31, 2013 Other income (expenses), net	Mar. 31, 2012 Other income (expenses), net	Mar. 31, 2013 Other, net	Mar. 31, 2012 Other, net	Mar. 31, 2013 4.50% Senior Notes	Dec. 31, 2012 4.50% Senior Notes	Mar. 31, 2013 5.10% Senior Notes	Dec. 31, 2012 5.10% Senior Notes
Fair Value, Option, Quantitative Disclosures [Line Items]
Debt instrument, interest rate										4.50%	4.50%	5.10%	5.10%
Foreign currency forward contracts, notional values	$ 236.5	$ 274.0
Fair value of foreign currency forward contracts, assets			0.3	0.3
Fair value of foreign currency forward contracts, liabilities					0.8
Recognized gains (losses) of foreign currency forward contracts						(4.7)	1.3
Change in the fair value of foreign currency forward contracts								4.7	(1.3)
Cash settlements								$ (5.5)	$ 0.4