Stock-Based Compensation Plans (Summary Of Stock Option Activity Under All Plans) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Y		Mar. 31, 2011
Stock-Based Compensation Plans [Abstract]
Options outstanding, beginning of period, Shares	1,501		2,068
Options outstanding, beginning of period, Exercise Price	$ 31		$ 31
Granted, Shares	29		25
Granted, Exercise Price	$ 44		$ 37
Exercised, Shares	(267)		(381)
Exercised, Exercise Price	$ 28		$ 29
Expired, Shares			(7)
Expired, Exercise Price	$ 0		$ 37
Options outstanding, end of period, Shares	1,263	[1]	1,705	[1]
Options outstanding, end of period, Exercise Price	$ 32	[1]	$ 31	[1]
Options exercisable, end of period, Shares	1,195	[1]	1,552	[1]
Options exercisable, end of period, Exercise Price	$ 32	[1]	$ 33	[1]
Options vested and expected to vest, end of period, Shares	1,262	[1]	1,698	[1]
Options vested and expected to vest, end of period, Exercise Price	$ 32	[1]	$ 31	[1]
Weighted average fair value of options granted during the period	$ 15.18		$ 13.18
Aggregate intrinsic value of stock options outstanding	$ 18,664
Aggregate intrinsic value of stock options exercisable	17,795
Aggregate intrinsic values of stock options expected to vest	$ 18,627
Weighted average remaining contractual lives of stock options outstanding, years	3.2
Weighted average remaining contractual lives of stock options exercisable, years	2.9
Weighted average remaining contractual lives of stock options expected to vest, years	3.2

[1] At March 31, 2012, the aggregate intrinsic value of stock options outstanding, exercisable and vested/expected to vest was $18,664, $17,795 and $18,627, respectively. At that same date, the weighted average remaining contractual lives of stock options outstanding, exercisable and vested/expected to vest was 3.2 years, 2.9 years and 3.2 years, respectively.