Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Summary of Quarterly Financial Data

	Three Months Ended
	March 31, 2017		June 30, 2017		September 30, 2017		December 31, 2017
	(in millions except per share data)
Revenues:
Manufacturing	$	698.7	$	713.6	$	698.7	$	709.6
Leasing	178.6		191.9		274.9		196.8
	877.3		905.5		973.6		906.4
Operating costs:
Costs of revenues:
Manufacturing	576.1		589.7		565.6		581.8
Leasing	83.6		92.2		156.6		99.9
	659.7		681.9		722.2		681.7
Selling, engineering, and administrative expenses	102.3		112.8		114.5		125.2
Gains on disposition of property	1.3		24.4		16.1		44.8
Operating profit	116.6		135.2		153.0		144.3
Income before income taxes	72.5		91.3		107.6		100.6
Provision (benefit) for income taxes	20.8		37.3		39.7		(439.4		)
Net income	51.7		54.0		67.9		540.0
Net income attributable to Trinity Industries, Inc.	46.0		51.1		66.9		538.5
Net income attributable to Trinity Industries, Inc. per common share:
Basic	$	0.30	$	0.34	$	0.44	$	3.56
Diluted	$	0.30	$	0.33	$	0.43	$	3.42

	Three Months Ended
	March 31, 2016		June 30, 2016		September 30, 2016		December 31, 2016
	(in millions except per share data)
Revenues:
Manufacturing	$	1,010.1	$	888.8	$	938.5	$	926.0
Leasing	177.8		296.1		173.2		177.8
	1,187.9		1,184.9		1,111.7		1,103.8
Operating costs:
Costs of revenues:
Manufacturing	793.9		719.1		745.4		761.2
Leasing	96.0		178.6		81.9		80.0
	889.9		897.7		827.3		841.2
Selling, engineering, and administrative expenses	96.5		106.7		102.3		101.9
Gains on disposition of property	1.9		11.1		1.5		2.9
Operating profit	203.4		191.6		183.6		163.6
Income before income taxes	159.5		152.2		139.5		115.6
Provision for income taxes	57.4		53.4		49.9		41.4
Net income	102.1		98.8		89.6		74.2
Net income attributable to Trinity Industries, Inc.	97.2		94.6		84.2		67.6
Net income attributable to Trinity Industries, Inc. per common share:
Basic	$	0.64	$	0.62	$	0.55	$	0.44
Diluted	$	0.64	$	0.62	$	0.55	$	0.44