Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Supplementary Information [Line Items]
Stock split additional shares issuable	One additional share of common stock for every two shares of common stock
Stock split conversion ratio	1.5
Common stock, par value	$ 0.01		$ 0.01
Stock-based compensation costs	$ 37.2	$ 19.1
Interest income	1.5	1.7
Benefit plans costs reclassified from accumulated OCI to income	1.9	1.7
Deferred gains and losses on derivatives reclassified from accumulated OCI to income	6.1	0.2
Venezuela devaluation-related charges	$ 29.0
Venezuela Operations
Supplementary Information [Line Items]
Official exchange rate of foreign currency (per U.S. dollar) for remeasuring company's consolidated financial statements	6.30