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Stock-Based Compensation (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Weighted Average Grant Date Fair Value [Abstract]    
Granted $ 55.78  
Restricted Stock Units (RSUs) [Member]
   
Restricted Stock Units [Abstract]    
Non-vested at beginning of year 13,155  
Granted 8,815  
Vested (4,870)  
Forfeited (1,184)  
Non-vested at end of year 15,916 13,155
Weighted Average Grant Date Fair Value [Abstract]    
Non-vested at beginning of year $ 36.49  
Granted $ 56.17  
Vested $ 36.05  
Forfeited $ 42.39  
Non-vested at end of year $ 47.08 $ 36.49
Weighted average grant date fair value of restricted stock granted during the year $ 56.17 $ 35.96
Total intrinsic value of restricted stock that vested during year $ 0.3 $ 0.1