Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2014

Stockholders' Equity Note [Abstract]

Common stock reserved for conversion and incentive plans

The following shares of common stock were reserved as of December 31, 2014 (in millions):

GATX Corporation 2004 Equity Incentive Compensation Plan	2.5
GATX Corporation 2012 Incentive Award Plan	3.5
	6.0