Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues [Abstract]
Revenues	$ 722.4	$ 416.8	$ 1,364.1	$ 889.5
Cost of revenues:
Cost of revenues:	601.2	325.6	1,139.7	724.1
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	54.3	45.0	104.2	89.7
Gains on dispositions of property:
Lease portfolio sales	29.8	26.9	43.3	38.7
Other	0.6	0.9	2.4	14.4
Gains on dispositions of property:	30.4	27.8	45.7	53.1
Restructuring activities, net	(1.8)	1.0	(2.2)	1.0
Total operating profit	99.1	73.0	168.1	127.8
Other (income) expense:
Interest expense, net	66.9	49.7	129.0	93.2
Loss on extinguishment of debt	0.0	1.5	0.0	1.5
Other Nonoperating Income	1.3	(0.5)	2.9	(2.1)
Other (income) expense:	68.2	50.7	131.9	92.6
Income from continuing operations before income taxes	30.9	22.3	36.2	35.2
Current Income Tax Expense (Benefit)	3.1	2.0	4.0	3.8
Provision (benefit) for deferred income taxes	4.3	3.8	(8.1)	5.0
Provision (benefit) for income taxes	7.4	5.8	(4.1)	8.8
Income from continuing operations	23.5	16.5	40.3	26.4
Loss from discontinued operations, net of benefit for income taxes of $0.7, $0.5, $1.5 and $2.5	(2.3)	(3.4)	(5.4)	(10.3)
Loss on sale of discontinued operations, net of benefit for income taxes of $—, $1.0, $— and $1.4	0.0	(4.6)	0.0	(5.7)
Net income	21.2	8.5	34.9	10.4
Net income attributable to noncontrolling interest	4.2	4.8	13.5	7.4
Net income attributable to Trinity Industries, Inc.	$ 17.0	$ 3.7	$ 21.4	$ 3.0
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.24	$ 0.14	$ 0.33	$ 0.23
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	(0.03)	(0.10)	(0.07)	(0.19)
Basic net income attributable to Trinity Industries, Inc.	0.21	0.04	0.26	0.04
Income (Loss) from Continuing Operations, Per Diluted Share	0.23	0.14	0.32	0.23
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	(0.03)	(0.10)	(0.06)	(0.19)
Diluted net income attributable to Trinity Industries, Inc.	$ 0.20	$ 0.04	$ 0.26	$ 0.04
Weighted average number of shares outstanding:
Weighted Average Number of Shares Outstanding, Basic	81.2	82.4	81.0	82.7
Weighted Average Number of Shares Outstanding, Diluted	83.4	84.4	83.5	84.9
Manufacturing
Revenues [Abstract]
Revenues	$ 499.4	$ 221.7	$ 937.8	$ 511.5
Cost of revenues:
Cost of revenues:	479.9	220.8	901.9	516.4
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	8.7	7.0	16.9	16.7
Leasing
Revenues [Abstract]
Revenues	223.0	195.1	426.3	378.0
Cost of revenues:
Cost of revenues:	121.3	104.8	237.8	207.7
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	14.0	12.6	29.7	25.4
Other
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	$ 31.6	$ 25.4	$ 57.6	$ 47.6