Stockholders' Equity (Summary Of Stock Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011
Stockholders' Equity [Abstract]
Number of Shares, Options outstanding at December 31, 2010	5,041,303
Number of Shares, Granted	595,364
Number of Shares, Exercised	(1,106,403)
Number of Shares, Forfeited	(228,456)
Number of Shares, Options outstanding at December 31, 2011	4,301,808
Weighted-Average Exercise price, Options outstanding at December 31, 2010	$ 17.39
Weighted-Average Exercise price, Granted	$ 19.71
Weighted-Average Exercise price, Exercised	$ 14.22
Weighted-Average Exercise price, Forfeited	$ 20.79
Weighted-Average Exercise price, Options outstanding at December 31, 2011	$ 18.34
Weighted-Average Remaining Contractual Term (in years), Options outstanding at December 31, 2011	6.9
Aggregate Intrinsic Value, Options outstanding at December 31, 2011	$ 119.4	[1]
Number of Shares, Vested and exercisable as of December 31, 2011	2,739,718
Weighted-Average Exercise Price, Vested and exercisable as of December 31, 2011	$ 16.72
Weighted-Average Remaining Contractual Term (in years), Vested and exercisable as of December 31, 2011	5.9
Aggregate Intrinsic Value, Vested and exercisable as of December 31, 2011	$ 80.5	[1]
Closing stock price of common stock	$ 46.11

[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 $46.11 of the Company's common stock on December 30, 2011. The amount is presented in millions.