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Investment in Affiliated Companies (Tables)
9 Months Ended
Sep. 30, 2011
Investments in Affiliated Companies [Abstract] 
Operating results of affiliated companies of GATX
                                 
    Three Months Ended
September 30		     Nine Months  Ended
September 30		  
    2011     2010     2011     2010  

Revenues

   $ 165.9     $ 155.5     $ 502.0     $ 488.9  

Pre-tax income reported by affiliates

     6.7       15.7       89.2       57.8