Share Options And Awards (Summary Of Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares Under Option, Outstanding beginning of period	3,543,746	4,085,702	4,607,703
Shares Under Option, Forfeited or expired	(307,413)	(79,108)	(40,390)
Shares Under Option, Exercised	(339,210)	(462,848)	(481,611)
Shares Under Option, Outstanding end of period	2,897,123	3,543,746	4,085,702
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, Outstanding beginning of period	$ 29.16	$ 28.98	$ 28.09
Weighted Average Exercise Price, Forfeited or expired	$ 39.73	$ 32.61	$ 27.12
Weighted Average Exercise Price, Exercised	$ 22.98	$ 26.95	$ 20.70
Weighted Average Exercise Price, Outstanding end of period	$ 28.76	$ 29.16	$ 28.98