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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2011
Stock-Based Compensation 
Estimated Fair Value Of The Stock Options Granted
Fair Value Of The Restricted Stock Awards Granted During The Periods
                                 
     Three Months Ended
September 30,
    Nine Months Ended
September 30,
 
     2011     2010     2011     2010  
         

Shares granted

     12,402        192,272        209,150        440,655   
         

Estimated fair value (in millions)

   $ 0.6      $ 6.0      $ 10.9      $ 16.6   
         

Percentage of shares granted expected to be distributed

     95     89     93     91