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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, 2012
Dec. 31, 2011
Jun. 30, 2012
$30.06-$31.48 [Member]
Jun. 30, 2012
$41.16-$43.94 [Member]
Jun. 30, 2012
$45.53-$73.32 [Member]
Range of exercise prices, minimum     $ 30.06 $ 41.16 $ 45.53
Range of exercise prices, maximum     $ 31.48 $ 43.94 $ 73.32
Outstanding Options, Number 975,561 [1] 1,339,536 334,036 [1] 259,632 [1] 381,893 [1]
Outstanding Options, Weighted Average Price $ 40.87 [1] $ 42.27 $ 30.09 [1] $ 42.72 [1] $ 49.05 [1]
Exercisable Options, Number 688,013 [1]   138,229 [1] 241,000 [1] 308,784 [1]
Exercisable Options, Weighted Average Price $ 43.11 [1]   $ 30.13 [1] $ 42.63 [1] $ 49.29 [1]
Aggregate intrinsic value of outstanding options $ 26.3        
Aggregate Intrinsic Value of Exercisable Options $ 17.0        
Closing share price per share for calculation of aggregate intrinsic values $ 67.67        
[1] The aggregate intrinsic value of outstanding and exercisable options at June 30, 2012 were $26.3 million and $17.0 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $67.67 per share on June 30, 2012 and the strike price of the underlying award.