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Share-Based Compensation (Summary Of Stock Option Activity) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Shares Under Option    
Outstanding at December 31, 2010 4,155,000  
Granted 200,000 540,000
Exercised (108,000)  
Cancelled/forfeited/expired (202,000)  
Outstanding at June 30, 2011 4,045,000  
Exercisable at June 30, 2011 1,056,000  
Weighted Average Exercise Price    
Outstanding at December 31, 2010 $ 20.80  
Granted $ 18.62  
Exercised $ 9.25  
Cancelled / forfeited / expired $ 24.96  
Outstanding at June 30, 2011 $ 20.73  
Exercisable at June 30, 2011 $ 11.48  
Weighted Average Remaining Contractual Term (Years)    
Outstanding at December 31, 2010 6.3  
Granted 9.7  
Outstanding at June 30, 2011 6.3  
Exercisable at June 30, 2011 5.3  
Aggregate Intrinsic Value    
Outstanding at December 31, 2010 $ 14.4  
Outstanding at June 30, 2011 16.9  
Exercisable at June 30, 2011 $ 8.6