Business and Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended							3 Months Ended	12 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 SG&A	Dec. 31, 2011 SG&A	Dec. 31, 2010 SG&A	Feb. 08, 2013 Changed Exchange Rate	Mar. 31, 2013 Pre Tax	Dec. 31, 2010 Venezuela Operations	Dec. 31, 2012 Venezuela Operations	Dec. 31, 2010 Venezuela Operations SG&A
Supplementary Information [Line Items]
Stock-based compensation costs	$ 67.1	$ 23.8	$ 24.3
Interest income	6.7	7.2	4.9
Foreign currency transaction gains/(losses)	1.9	(11.1)	8.7
Official exchange rate of foreign currency (per U.S. dollar) for remeasuring company's consolidated financial statements										4.30
Bolivar exchange rate for imported non-essential goods (per U.S. dollar)									4.30
Venezuela devaluation charges									14.0
Venezuela hyperinflationary charges											56.6
Official exchange rate of foreign currency remeasured (per U.S. dollar)							6.30
Venezuela devaluation charges								27
Concentrations of credit risk, percentage of sales to single customer	20.00%	20.00%	21.00%
Advertising cost				$ 156	$ 143	$ 129