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EXCEL - IDEA: XBRL DOCUMENT - GATX CORPFinancial_Report.xls
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v2.4.0.6
Income Taxes (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Income Taxes (Textual) [Abstract]    
GATX's effective tax rate 30.00% 23.00%
Effective tax rate excluding the effect of interest rate swap 29.00% 27.00%
Gross liability for unrecognized tax benefits $ 20.8  
Decrease in income tax expenses unrecognized tax benefits if recognized 20.8  
Decrease in income tax expenses unrecognized tax benefits if recognized net of federal tax 18.8  
Unrecognized state tax benefits that may be recognized 15.5  
Unrecognized foreign tax benefits that may be recognized $ 0.4  
Estimated time period for recognition of unrecognized taxes within the next 12 months