Stock-Based Compensation (Summary Of Stock Option Activity) (Detail) (Stock Option [Member], USD $)	6 Months Ended
	Jun. 30, 2012
Stock Option [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Aggregate Intrinsic Value, Outstanding at June 30, 2012	$ 244.7	[1]
Aggregate Intrinsic Value, Vested and exercisable at June 30, 2012	$ 150.2	[1]
Weighted Average Remaining Contractual Term (in years), Outstanding at June 30, 2012	7 years 11 days
Weighted Average Remaining Contractual Term (in years), Vested and exercisable at June 30,2012	5 years 8 months 27 days
Weighted Average Exercise Price, Outstanding at December 31, 2011	$ 18.34
Weighted Average Exercise Price, Granted	$ 66.99
Weighted Average Exercise Price, Exercised	$ 11.93
Weighted Average Exercise Price, Forfeited	$ 25.88
Weighted Average Exercise Price, Outstanding at June 30, 2012	$ 24.80
Weighted Average Exercise Price,Vested and exercisable at June 30, 2012	$ 19.60
Number of Options, Outstanding at December 31, 2011	4,301,808
Number of Options, Granted	370,538
Number of Options, Exercised	(949,531)
Number of Options, Forfeited	(48,487)
Number of Options, Outstanding at June 30, 2012	3,674,328
Number of Options, Vested and exercisable at June 30, 2012	2,092,153
Closing stock price of common stock	$ 91.40

[1] The aggregate intrinsic value is calculated as the pre-tax difference between the exercise price of the underlying awards and the closing stock price per share of $91.40 of the Company's common stock on June 29, 2012. The amount is presented in millions.