Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Total revenues	$ 942.3	$ 905.5	$ 1,773.6	$ 1,782.8
Cost of revenues:
Total cost of revenues	718.1	682.3	1,348.2	1,342.5
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	110.4	113.0	215.3	215.5
Gains on dispositions of property:
Net gains on railcar lease fleet sales owned more than one year at the time of sale	9.5	23.7	11.6	23.7
Other	2.2	0.7	2.4	2.0
Total gains (losses) on disposition of property	11.7	24.4	14.0	25.7
Total operating profit	125.5	134.6	224.1	250.5
Other (income) expense:
Interest income	(3.7)	(2.3)	(7.6)	(4.0)
Interest expense	43.8	45.7	90.1	90.7
Other, net	(0.7)	(0.1)	(0.9)	0.0
Total other (income) expense	39.4	43.3	81.6	86.7
Income before income taxes	86.1	91.3	142.5	163.8
Provision for income taxes	20.6	37.3	35.4	58.1
Net income	65.5	54.0	107.1	105.7
Net income attributable to noncontrolling interest	1.4	2.9	2.8	8.6
Net income attributable to Trinity Industries, Inc.	$ 64.1	$ 51.1	$ 104.3	$ 97.1
Net income attributable to Trinity Industries, Inc. per common share:
Basic (in dollars per share)	$ 0.43	$ 0.34	$ 0.70	$ 0.64
Diluted (in dollars per share)	$ 0.43	$ 0.33	$ 0.68	$ 0.63
Weighted average number of shares outstanding:
Basic (in shares)	146.2	149.1	146.7	148.9
Diluted (in shares)	147.0	151.0	150.2	151.0
Dividends declared per common share (in dollars per share)	$ 0.13	$ 0.13	$ 0.26	$ 0.24
Manufacturing
Revenues:
Total revenues	$ 729.1	$ 713.6	$ 1,386.1	$ 1,412.3
Cost of revenues:
Total cost of revenues	599.6	590.1	1,136.3	1,166.7
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	54.4	61.5	107.6	118.1
Leasing
Revenues:
Total revenues	213.2	191.9	387.5	370.5
Cost of revenues:
Total cost of revenues	118.5	92.2	211.9	175.8
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	12.6	13.1	24.8	23.9
Other
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	$ 43.4	$ 38.4	$ 82.9	$ 73.5