Stock-Based Compensation Plans (Schedule Of Company's Stock Option Plans) (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Options outstanding Beginning Balance | shares	2,724
Number of Shares, Granted | shares	563
Number of Shares, Exercised | shares	(663)
Number of Shares, Canceled | shares	(74)
Number of Shares, Options outstanding Ending Balance | shares	2,550
Number of Shares, Options exercisable Ending Balance | shares	861
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, Options outstanding Beginning Balance | $ / shares	$ 51.41
Weighted Average Exercise Price, Granted | $ / shares	73.90
Weighted Average Exercise Price, Exercised | $ / shares	50.82
Weighted Average Exercise Price, Canceled | $ / shares	54.02
Weighted Average Exercise Price, Options outstanding Ending Balance | $ / shares	56.45
Weighted Average Exercise Price, Options exercisable Ending Balance | $ / shares	$ 54.51
Weighted Average Remaining Life (Years), Options outstanding	7 years 2 months 1 day
Weighted Average Remaining Life (Years), Options exercisable	5 years 4 months 2 days