Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Total revenues	$ 973.6	$ 1,111.7	$ 2,756.4	$ 3,484.5
Cost of revenues:
Total cost of revenues	722.2	827.3	2,063.8	2,614.9
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	114.5	102.3	329.6	305.5
Gains (losses) on dispositions of property:
Net gains on railcar lease fleet sales owned more than one year at the time of sale	16.5	0.0	40.2	13.5
Other	(0.4)	1.5	1.6	1.0
Total gains (losses) on disposition of property	16.1	1.5	41.8	14.5
Total operating profit	153.0	183.6	404.8	578.6
Other (income) expense:
Interest income	(3.1)	(1.4)	(7.1)	(3.9)
Interest expense	46.8	45.3	137.5	136.7
Other, net	1.7	0.2	3.0	(5.4)
Total other (income) expense	45.4	44.1	133.4	127.4
Income before income taxes	107.6	139.5	271.4	451.2
Provision for income taxes	39.7	49.9	97.8	160.7
Net income	67.9	89.6	173.6	290.5
Net income attributable to noncontrolling interest	1.0	5.4	9.6	14.5
Net income attributable to Trinity Industries, Inc.	$ 66.9	$ 84.2	$ 164.0	$ 276.0
Net income attributable to Trinity Industries, Inc. per common share:
Basic (in dollars per share)	$ 0.44	$ 0.55	$ 1.08	$ 1.81
Diluted (in dollars per share)	$ 0.43	$ 0.55	$ 1.06	$ 1.81
Weighted average number of shares outstanding:
Basic (in shares)	148.0	148.7	148.6	148.3
Diluted (in shares)	151.3	148.7	151.1	148.3
Dividends declared per common share (in dollars per share)	$ 0.13	$ 0.11	$ 0.37	$ 0.33
Manufacturing
Revenues:
Total revenues	$ 698.7	$ 938.5	$ 2,111.0	$ 2,837.4
Cost of revenues:
Total cost of revenues	565.6	745.4	1,731.4	2,258.4
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	59.1	54.9	177.0	176.6
Leasing
Revenues:
Total revenues	274.9	173.2	645.4	647.1
Cost of revenues:
Total cost of revenues	156.6	81.9	332.4	356.5
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	13.9	11.8	37.8	33.9
Other
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	$ 41.5	$ 35.6	$ 114.8	$ 95.0