Stock-Based Compensation Plans (Summary Of Stock Option Plan Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 Stock Option Shares [Member]	Dec. 31, 2010 Stock Option Shares [Member]	Dec. 31, 2009 Stock Option Shares [Member]	Dec. 31, 2011 Weighted Average Exercise Price [Member]	Dec. 31, 2010 Weighted Average Exercise Price [Member]	Dec. 31, 2009 Weighted Average Exercise Price [Member]	Dec. 31, 2008 Weighted Average Exercise Price [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning of year, Shares	2,843,909	3,131,142	2,998,821
Granted, Shares	297,000	412,250	530,000
Exercised, Shares	(120,064)	(326,823)	(87,469)
Forfeited or cancelled, Shares	(49,165)	(247,260)	(126,110)
Expired, Shares	(256,250)	(125,400)	(184,100)
Outstanding, end of year, Shares	2,715,430	2,843,909	3,131,142
Exercisable, end of year, Shares	1,686,930	2,037,159	2,398,725
Outstanding, beginning of year, Weighted Average Exercise Price				$ 38.57	$ 39.22	$ 39.16	$ 41.02
Granted, Weighted Average Exercise Price				$ 46.47	$ 42.72	$ 34.13
Exercised, Weighted Average Exercise Price				$ 32.82	$ 36.88	$ 35.68
Forfeited or cancelled, Weighted Average Exercise Price				$ 41.67	$ 44.49	$ 45.81
Expired, Weighted Average Exercise Price				$ 57.00	$ 44.91	$ 52.07
Outstanding, end of year, Weighted Average Exercise Price				$ 38.57	$ 39.22	$ 39.16	$ 41.02
Exercisable, end of year, Weighted Average Exercise Price				$ 37.69	$ 39.74	$ 39.39