Selected Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data (unaudited)

	First  Quarter		(a)	Second Quarter			Third Quarter			Fourth Quarter		Total
	In millions, except per share data
2012
Total revenues	$	256.5		$	323.1		$	331.9		$	331.7	$	1,243.2
Net income	$	30.3		$	23.5	(b)	$	53.8	(c)	$	29.7	$	137.3
Per Share Data
Basic	$	0.65		$	0.50		$	1.15		$	0.63	$	2.93
Diluted	$	0.64		$	0.49		$	1.13		$	0.62	$	2.88
2011
Total revenues	$	249.4		$	296.8		$	315.2		$	330.0	$	1,191.4
Net income	$	19.9		$	26.4		$	32.9		$	31.6	$	110.8
Per Share Data
Basic	$	0.43		$	0.57		$	0.71		$	0.68	$	2.39
Diluted	$	0.42		$	0.56		$	0.70		$	0.67	$	2.35

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(a) Total revenues and net income in the first quarter of each year are typically lower than the subsequent quarters due to seasonal inactivity at ASC.

(b) The decrease in income from the first quarter of 2012 was primarily due to a $12.1 million loss on the termination of a qualified hedge at GATX's AAE Cargo affiliate, partially offset by an increase in seasonal income at ASC.

(c) The increase in income from the second quarter of 2012 was primarily due to the absence of the hedge loss at AAE and the recognition of $15.5 million of tax benefits.