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Share-Based Compensation (Summary Of Share Options Outstanding And Exercisable) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
$30.06-$41.16 [Member]
Jun. 30, 2013
$42.90-$43.94 [Member]
Jun. 30, 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 635,568 [1] 838,754 228,012 [1] 108,947 [1] 298,609 [1]
Outstanding Options, Weighted Average Price $ 41.60 [1] $ 42.36 $ 33.14 [1] $ 43.43 [1] $ 47.39 [1]
Exercisable Options, Number 537,663 [1]   130,107 [1] 108,947 [1] 298,609 [1]
Exercisable Options, Weighted Average Price $ 43.70 [1]   $ 35.46 [1] $ 43.43 [1] $ 47.39 [1]
Aggregate intrinsic value of outstanding options $ 17.5        
Aggregate Intrinsic Value of Exercisable Options $ 13.7        
Closing share price per share for calculation of aggregate intrinsic values $ 69.14        
[1] The aggregate intrinsic value of outstanding and exercisable options at June 30, 2013 was $17.5 million and $13.7 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $69.14 per share on June 30, 2013 and the strike price of the underlying award.