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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 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
June 30,
    Six Months Ended
June 30,
 
     2011     2010     2011     2010  

Shares granted

     4,167        0        196,748        248,383   

Estimated fair value (in millions)

   $ 0.2      $ 0      $ 10.3      $ 10.6   

Percentage of shares granted expected to be distributed

     95     0     93     93