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Share-Based Compensation (Summary Of Share Options Outstanding And Exercisable) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
$30.06-$41.16 [Member]
Mar. 31, 2013
$42.90-$43.94 [Member]
Mar. 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 673,357 [1] 838,754 240,713 [1] 108,947 [1] 323,697 [1]
Outstanding Options, Weighted Average Price $ 41.62 [1] $ 42.36 $ 32.98 [1] $ 43.43 [1] $ 47.44 [1]
Exercisable Options, Number 575,452 [1]   142,808 [1] 108,947 [1] 323,697 [1]
Exercisable Options, Weighted Average Price $ 43.59 [1]   $ 34.98 [1] $ 43.43 [1] $ 47.44 [1]
Aggregate intrinsic value of outstanding options $ 18.2        
Aggregate Intrinsic Value of Exercisable Options $ 14.4        
Closing share price per share for calculation of aggregate intrinsic values $ 68.68        
[1] The aggregate intrinsic value of outstanding and exercisable options at March 31, 2013 was $18.2 million and $14.4 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $68.68 per share on March 31, 2013 and the strike price of the underlying award.