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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
 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Exercise Price Thirty Point Zero Six Member [Domain]
Jun. 30, 2014
Range Of Exercise Prices Forty One Point One Six To Forty Three Point Nine Four [Domain]
Jun. 30, 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 $ 41.16 $ 48.02
Range of exercise prices, maximum     $ 30.06 $ 43.94 $ 64.75
Outstanding and Exercisable Options, Number 341,127 [1],[2]   139,767 [1],[2] 119,242 [1],[2] 82,118 [1],[2]
Outstanding and Exercisable Options, Weighted Average Price     $ 30.06 [1],[2] $ 42.46 [1],[2] $ 50.32 [1],[2]
Aggregate intrinsic value of outstanding options $ 10.9        
Aggregate Intrinsic Value of Exercisable Options $ 10.9        
Closing share price per share for calculation of aggregate intrinsic values $ 71.15        
Share Based Compensation Shares Authorized Under Stock Options Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price $ 39.27 [1],[2] $ 41.59      
[1] The aggregate intrinsic value of options outstanding and exercisable at June 30, 2014 was $10.9 million. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $71.15 per share on June 30, 2014 and the strike price of the underlying award.
[2] As of June 30, 2014, all options outstanding are also exercisable.