Share-Based Compensation and Non-Qualified Deferred Compensation Plan (Summary Of Share Options Outstanding And Exercisable) (Details) (USD $) In Millions, except Share data, unless otherwise specified				3 Months Ended
	Mar. 31, 2014		Dec. 31, 2013	Mar. 31, 2014 $30.06-$41.16 [Member]		Mar. 31, 2014 Range Of Exercise Prices Forty Three Point Nine Zero To Forty Five Point Five Three [Member] [Domain]		Mar. 31, 2014 Range Of Exercise Prices Forty Eight Point Zero Two To Sixty Four Point Seven Five Member [Domain]
Range of exercise prices, minimum				$ 30.06		$ 43.90		$ 48.02
Range of exercise prices, maximum				$ 41.16		$ 45.53		$ 64.75
Outstanding and Exercisable Options, Number	516,959	[1],[2]		207,036	[1],[2]	151,837	[1],[2]	158,086	[1],[2]
Outstanding and Exercisable Options, Weighted Average Price				$ 33.46	[1],[2]	$ 44.94	[1],[2]	$ 56.96	[1],[2]
Aggregate intrinsic value of outstanding options	$ 12.1
Aggregate Intrinsic Value of Exercisable Options	$ 12.1
Closing share price per share for calculation of aggregate intrinsic values	$ 67.34
Share Based Compensation Shares Authorized Under Stock Options Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price	$ 44.02	[1],[2]	$ 41.59

[1] The aggregate intrinsic value of options outstanding and exercisable at March 31, 2014 was $12.1 million. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $67.34 per share on March 31, 2014 and the strike price of the underlying award.

[2] As of March 31, 2014, all options outstanding are also exercisable.