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Share Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2011
Share-Based Compensation [Abstract]  
Weighted Average Estimated Fair Value
          The weighted average estimated fair value of GATX’s 2011 SAR awards and underlying assumptions thereof are noted in the table below. The vesting period for the 2011 SAR grant is 3 years, with 1/3 vesting after each year.
         
    2011
Weighted average fair value of SAR award
  $ 13.88  
Annual dividend
  $ 1.16  
Expected life of the SAR, in years
    4.3  
Risk free interest rate
    1.6 %
Dividend yield
    3.4 %
Expected stock price volatility
    41.91 %