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Description of Business
6 Months Ended
Jun. 30, 2011
Description of Business and Basis of Presentation [Abstract]  
Description of Business
NOTE 1. Description of Business
          GATX Corporation (“GATX” or the “Company”) leases, operates and manages long-lived, widely-used assets in the rail, marine and industrial equipment markets. GATX also invests in joint ventures that complement existing business activities. Headquartered in Chicago, Illinois, GATX has three financial reporting segments: Rail, Specialty and American Steamship Company (“ASC”).