Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Total revenues	$ 905.5	$ 1,184.9	$ 1,782.8	$ 2,372.8
Cost of revenues:
Total cost of revenues	681.9	897.7	1,341.6	1,787.6
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	112.8	106.7	215.1	203.2
Gains (losses) on dispositions of property:
Net gains on railcar lease fleet sales owned more than one year at the time of sale	23.7	11.4	23.7	13.5
Other	0.7	(0.3)	2.0	(0.5)
Total gains (losses) on disposition of property	24.4	11.1	25.7	13.0
Total operating profit	135.2	191.6	251.8	395.0
Other (income) expense:
Interest income	(2.3)	(1.3)	(4.0)	(2.5)
Interest expense	45.7	45.6	90.7	91.4
Other, net	0.5	(4.9)	1.3	(5.6)
Total other (income) expense	43.9	39.4	88.0	83.3
Income before income taxes	91.3	152.2	163.8	311.7
Provision for income taxes	37.3	53.4	58.1	110.8
Net income	54.0	98.8	105.7	200.9
Net income attributable to noncontrolling interest	2.9	4.2	8.6	9.1
Net income attributable to Trinity Industries, Inc.	$ 51.1	$ 94.6	$ 97.1	$ 191.8
Net income attributable to Trinity Industries, Inc. per common share:
Basic (in dollars per share)	$ 0.34	$ 0.62	$ 0.64	$ 1.25
Diluted (in dollars per share)	$ 0.33	$ 0.62	$ 0.63	$ 1.25
Weighted average number of shares outstanding:
Basic (in shares)	149.1	147.8	148.9	148.7
Diluted (in shares)	151.0	147.8	151.0	148.7
Dividends declared per common share (in dollars per share)	$ 0.13	$ 0.11	$ 0.24	$ 0.22
Manufacturing
Revenues:
Total revenues	$ 713.6	$ 888.8	$ 1,412.3	$ 1,898.9
Cost of revenues:
Total cost of revenues	589.7	719.1	1,165.8	1,513.0
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	61.4	60.3	117.9	121.7
Leasing
Revenues:
Total revenues	191.9	296.1	370.5	473.9
Cost of revenues:
Total cost of revenues	92.2	178.6	175.8	274.6
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	13.1	11.7	23.9	22.1
Other
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	$ 38.3	$ 34.7	$ 73.3	$ 59.4