Investments in Affiliated Companies (Tables)

12 Months Ended

Dec. 31, 2011

Investments in Affiliated Companies [Abstract]

Investments in affiliated companies by segment

	2011		2010
Rail	$	142.2	$	141.0
Portfolio Management		371.6		345.1
	$	513.8	$	486.1

Five largest investments in affiliates

	Segment	GATX’s Investment		GATX’s Percentage Ownership
Rolls-Royce & Partners Finance(a)	Portfolio Management	$	179.6		50.0	%
AAE Cargo AG	Rail		85.4		37.5	%
Enerven Compression, LLC	Portfolio Management		49.3		45.6	%
Cardinal Marine Investments, LLC	Portfolio Management		48.3		50.0	%
Adler Funding, LLC	Rail		35.2		12.5	%

(a) Combined investment balances of thirteen separate joint ventures

Pre tax share of affiliates earnings by segment

	2011		2010		2009
Rail	$	4.4	$	1.2	$	(10.1	)
Portfolio Management		36.2		36.9		39.1
	$	40.6	$	38.1	$	29.0

Operating results for all affiliated companies

	2011		2010		2009
Revenues	$	646.5	$	621.2	$	636.5
Pre-tax income reported by affiliates		93.7		71.0		57.2

Summarized balance sheet for all affiliated companies

	2011		2010
Total assets	$	5,085.3	$	5,052.6
Long-term liabilities		2,939.4		3,163.4
Other liabilities		1,257.7		1,017.3
Shareholders’ equity		888.2		871.9

Outstanding guarantees related to affiliated companies

	2011		2010
Lease and loan payment guarantees	$	42.0	$	30.0
Asset residual value guarantees		—		13.8