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Share-Based Compensation (Summary Of Share Options Outstanding And Exercisable) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
$30.06-$41.16 [Member]
Dec. 31, 2013
$42.90-$43.94 [Member]
Dec. 31, 2013
$45.53-$62.32 [Member]
Range of exercise prices, minimum         $ 30.06 $ 42.90 $ 45.53
Range of exercise prices, maximum         $ 41.16 $ 43.94 $ 62.32
Outstanding Options, Number 634,361 [1] 838,754 1,339,536 1,847,136 228,012 108,947 297,402
Outstanding Options, Weighted Average Price $ 41.59 $ 42.36 $ 42.27 $ 42.37 $ 33.14 $ 43.43 $ 47.39
Exercisable Options, Number 536,456 [1]       130,107 108,947 297,402
Exercisable Options, Weighted Average Price $ 43.69       $ 35.46 $ 43.43 $ 47.39
Aggregate intrinsic value of outstanding options $ 9.8            
Aggregate Intrinsic Value of Exercisable Options $ 7.2            
Closing share price per share for calculation of aggregate intrinsic values $ 56.88            
[1] (1)The aggregate intrinsic value of outstanding and exercisable options at December 31, 2013 was approximately $9.8 million and $7.2 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $56.88 per share on December 31, 2013 and the strike price of the underlying award.