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Variable Interest Entities (Tables)
6 Months Ended
Jun. 30, 2011
Variable Interest Entities [Abstract]  
Carrying amounts of assets and liabilities of consolidated VIE
          The carrying amounts of assets and liabilities of the VIE that GATX consolidates were as follows (in millions):
                 
    June 30   December 31
    2011   2010
Operating assets, net of accumulated depreciation (a)
  $ 107.1     $ 110.1  
Nonrecourse debt
    50.8       56.2  
Carrying amounts and maximum exposure to loss for non consolidated VIEs
          The carrying amounts and maximum exposure to loss with respect to VIEs that GATX does not consolidate were as follows (in millions):
                                 
    June 30, 2011     December 31, 2010  
    Net     Maximum     Net     Maximum  
    Carrying     Exposure     Carrying     Exposure  
    Amount     to Loss     Amount     to Loss  
Investments in affiliates
  $ 88.3     $ 88.3     $ 60.9     $ 60.9  
Leveraged leases
    71.8       71.8       74.1       74.1  
Other investment
    0.9       0.9       1.0       1.0  
 
                       
Total
  $ 161.0     $ 161.0     $ 136.0     $ 136.0