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Equity Incentive Program (Tables)
9 Months Ended
Sep. 30, 2011
Equity Incentive Program [Abstract] 
Assumptions used in determining fair value of stock appreciation rights and performance shares awarded during the period
The following assumptions were used in determining the fair value of the SARs and performance shares awarded during the respective periods:
 
   
SARs
  
Performance Shares
 
   
Nine Months Ended September 30,
  
Nine Months Ended September 30,
 
   
2011
  
2010
  
2011
  
2010
 
Risk-free interest rate
  2.68%  2.77%  1.34%  1.37%
Dividend yield
  1.70%  2.33%  1.61%  2.38%
Expected life (years)
  5.8   6.0   2.9   2.9 
Volatility
  33.56%  31.93%  40.48%  39.98%
Grant price
 $66.59  $42.88   n/a   n/a 
Fair value at date of grant
 $20.13  $11.66  $91.41  $57.49