Equity-Based Compensation (Summary Of Stock Option And SAR Activity) (Details) (Stock Option And Stock Appreciation Rights (SARs) [Member], USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Option And Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Outstanding at beginning of year	3,575,746	3,451,945	3,139,174
Shares, Granted	387,847	612,681	749,951
Shares, Exercised	(586,387)	(304,565)	(128,311)
Shares, Forfeited	(302,679)	(93,476)	(132,646)
Shares, Expired	(84,153)	(90,839)	(176,223)
Shares, Outstanding at end of period	2,990,374	3,575,746	3,451,945
Shares, Exercisable at end of period	1,894,324	2,042,664	1,884,449
Weighted-Average Exercise Price, Outstanding at beginning of year	$ 32.68	$ 32.81	$ 35.83
Weighted-Average Exercise Price, Granted	$ 41.13	$ 27.82	$ 19.96
Weighted-Average Exercise Price, Exercised	$ 25.91	$ 23.03	$ 17.53
Weighted-Average Exercise Price, Forfeited	$ 26.39	$ 30.44	$ 37.28
Weighted-Average Exercise Price, Expired	$ 40.69	$ 38.02	$ 39.88
Weighted-Average Exercise Price, Outstanding at end of period	$ 35.47	$ 32.68	$ 32.81
Weighted-Average Exercise Price, Exercisable at end of period	$ 38.00	$ 36.24	$ 35.23
Intrinsic value of exercised options and SARs	$ 8,100,000	$ 2,567,000	$ 738,000