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Investments in Affiliated Companies
6 Months Ended
Jun. 30, 2011
Investments in Affiliated Companies [Abstract]  
Investments in Affiliated Companies
NOTE 3. Investments in Affiliated Companies
          Investments in affiliated companies represent investments in, and loans to and from, domestic and foreign companies and joint ventures that are in businesses similar to those of GATX, such as lease financing and related services for customers operating rail, marine and industrial equipment assets, as well as other business activities, including ventures that provide asset residual value guarantees.
          Operating results for all affiliated companies, assuming GATX held a 100% interest, would be (in millions):
                                 
    Three Months Ended   Six Months Ended
    June 30   June 30
    2011   2010   2011   2010
Revenues
  $ 162.6     $ 157.3     $ 336.1     $ 333.4  
Pre-tax income reported by affiliates
    33.4       11.0       82.5       42.1