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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2015
Stockholders' Equity Note [Abstract]  
Common stock reserved for conversion and incentive plans
The following shares of common stock were reserved as of December 31, 2015 (in millions):
GATX Corporation 2004 Equity Incentive Compensation Plan
2.3

GATX Corporation 2012 Incentive Award Plan
3.5

 
5.8