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Share-Based Compensation And Benefit Plans (Summary Of Share Options Outstanding And Exercisable) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2011
$30.06-$41.16 [Member]
Dec. 31, 2011
$42.90-$45.53 [Member]
Dec. 31, 2011
$48.02-$73.32 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Range of Exercise Prices, Minimum         $ 30.06 $ 42.90 $ 48.02
Range of Exercise Prices, Maximum         $ 41.16 $ 45.53 $ 73.32
Outstanding Options, Number 1,339,536 [1] 1,847,136 1,983,358 1,536,527 470,019 [1] 466,060 [1] 403,457 [1]
Outstanding Options, Weighted Average Price $ 42.27 [1]       $ 32.06 [1] $ 44.32 [1] $ 51.79 [1]
Exercisable Options, Number 858,179 [1]       176,314 [1] 428,797 [1] 253,068 [1]
Exercisable Options, Weighted Average Price $ 45.37 [1]       $ 35.39 [1] $ 44.36 [1] $ 54.03 [1]
Aggregate intrinsic value of outstanding options $ 27.0            
Aggregate Intrinsic Value of Exercisable Options $ 14.7            
Closing share price per share for calculation of aggregate intrinsic values $ 62.24            
[1] The aggregate intrinsic value of outstanding and exercisable options at December 31, 2011 was approximately $27.0 million and $14.7 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $62.24 per share on December 31, 2011 and the strike price of the underlying award.