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Share Based Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share Based Compensation (Textual) [Abstract]        
Share-based compensation expense $ 3.1 $ 3.0 $ 9.5 $ 9.1
Tax benefits $ 1.2 $ 1.1 $ 3.6 $ 3.4
Stock Option SAR Awards [Member]
       
Additional Share Based Compensation (Textual) [Abstract]        
Stock awards     317,100,000,000  
Restricted Stock and Performance Share Awards [Member]
       
Additional Share Based Compensation (Textual) [Abstract]        
Stock awards     67,970,000,000  
Phantom Stock Units [Member]
       
Additional Share Based Compensation (Textual) [Abstract]        
Stock awards     68,780,000,000  
Stock Options SARs Granted Since Two Thousand Four [Member]
       
Additional Share Based Compensation (Textual) [Abstract]        
Stock awards     15,401,000,000