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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2012
Stock-Based Compensation [Abstract]  
Stock-Based Compensation Cost And Associated Tax Benefit
     Three Months Ended
March 31,
 
     2012      2011  

Stock compensation cost

   $ 15.0      $ 16.0  

Tax benefit

   $ 5.4      $ 5.6  
Weighted Average Assumptions Used In Determining The Fair Value For Options Granted

Expected dividend yield

     1.66

Expected stock volatility

     44

Risk-free interest rate

     1.55

Expected holding period

     7.4 yrs   

Grant date fair value

   $ 15.15   
Stock Option Exercises And Restricted Stock Vesting