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Share-Based Compensation (Summary Of Share Options Outstanding And Exercisable) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
$30.06-$31.48 [Member]
Sep. 30, 2012
$41.16-$43.94 [Member]
Sep. 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 848,712 [1] 1,339,536 210,750 [1] 258,632 [1] 379,330 [1]
Outstanding Options, Weighted Average Price $ 42.41 [1] $ 42.27 $ 30.06 [1] $ 42.72 [1] $ 49.05 [1]
Exercisable Options, Number 561,164 [1]   14,943 [1] 240,000 [1] 306,221 [1]
Exercisable Options, Weighted Average Price $ 45.93 [1]   $ 30.12 [1] $ 42.63 [1] $ 49.30 [1]
Aggregate intrinsic value of outstanding options $ 18.9        
Aggregate Intrinsic Value of Exercisable Options $ 10.6        
Closing share price per share for calculation of aggregate intrinsic values $ 64.49        
[1] The aggregate intrinsic value of outstanding and exercisable options at September 30, 2012 were $18.9 million and $10.6 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $64.49 per share on September 30, 2012 and the strike price of the underlying award.