Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues [Abstract]
Revenues	$ 841.4	$ 722.4	$ 1,651.0	$ 1,364.1
Cost of revenues:
Cost of revenues:	662.4	601.2	1,307.3	1,139.7
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	61.3	54.3	113.6	104.2
Gains on dispositions of property:
Lease portfolio sales	22.7	29.8	24.8	43.3
Gain (Loss) on Disposition of Other Assets	1.5	0.6	2.2	2.4
Gains on dispositions of property:	24.2	30.4	27.0	45.7
Restructuring activities, net	0.0	(1.8)	0.0	(2.2)
Total operating profit	141.9	99.1	257.1	168.1
Other (income) expense:
Interest expense, net	70.1	66.9	139.2	129.0
Other Nonoperating Income	(3.4)	1.3	0.0	2.9
Other (income) expense:	66.7	68.2	139.2	131.9
Income from continuing operations before income taxes	75.2	30.9	117.9	36.2
Current Income Tax Expense (Benefit)	13.8	3.1	26.9	4.0
Provision (benefit) for deferred income taxes	3.3	4.3	1.2	(8.1)
Provision (benefit) for income taxes	17.1	7.4	28.1	(4.1)
Income from continuing operations	58.1	23.5	89.8	40.3
Loss from discontinued operations, net of benefit for income taxes of $0.5, $0.7, $1.8, and $1.5	(1.7)	(2.3)	(6.0)	(5.4)
Net income	56.4	21.2	83.8	34.9
Net income attributable to noncontrolling interest	2.0	4.2	5.7	13.5
Net income attributable to Trinity Industries, Inc.	$ 54.4	$ 17.0	$ 78.1	$ 21.4
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.68	$ 0.24	$ 1.03	$ 0.33
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	(0.02)	(0.03)	(0.07)	(0.07)
Basic net income attributable to Trinity Industries, Inc.	0.66	0.21	0.96	0.26
Income (Loss) from Continuing Operations, Per Diluted Share	0.67	0.23	1.01	0.32
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	(0.02)	(0.03)	(0.07)	(0.06)
Diluted net income attributable to Trinity Industries, Inc.	$ 0.65	$ 0.20	$ 0.94	$ 0.26
Weighted average number of shares outstanding:
Weighted Average Number of Shares Outstanding, Basic	82.4	81.2	81.7	81.0
Weighted Average Number of Shares Outstanding, Diluted	84.1	83.4	83.4	83.5
Manufacturing
Revenues [Abstract]
Revenues	$ 560.9	$ 454.6	$ 1,086.2	$ 863.6
Cost of revenues:
Cost of revenues:	505.8	434.1	982.1	826.0
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	7.8	7.5	15.5	14.5
Leasing & Services
Revenues [Abstract]
Revenues	280.5	267.8	564.8	500.5
Cost of revenues:
Cost of revenues:	156.6	167.1	325.2	313.7
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	20.0	15.2	38.1	32.1
Corporate & other
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	$ 33.5	$ 31.6	$ 60.0	$ 57.6