Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues [Abstract]
Revenues	$ 798.8	$ 821.3	$ 2,449.8	$ 2,185.4
Cost of revenues:
Cost of revenues:	629.3	679.5	1,936.6	1,819.2
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	60.5	49.1	174.1	153.3
Gains on dispositions of property:
Lease portfolio sales	11.4	3.1	36.2	46.4
Gain (Loss) on Disposition of Other Assets	2.0	4.4	4.2	6.8
Gains on dispositions of property:	13.4	7.5	40.4	53.2
Restructuring activities, net	0.0	0.0	0.0	(2.2)
Total operating profit	122.4	100.2	379.5	268.3
Other (income) expense:
Interest expense, net	67.4	68.8	206.6	197.8
Other Nonoperating Income	(1.4)	(0.9)	(1.4)	2.0
Other (income) expense:	66.0	67.9	205.2	199.8
Income from continuing operations before income taxes	56.4	32.3	174.3	68.5
Current Income Tax Expense (Benefit)	18.3	22.2	45.2	26.2
Provision (benefit) for deferred income taxes	(2.7)	(16.2)	(1.5)	(24.3)
Provision (benefit) for income taxes	15.6	6.0	43.7	1.9
Income from continuing operations	40.8	26.3	130.6	66.6
Loss from discontinued operations, net of benefit for income taxes of $1.7, $0.7, $3.5, and $2.2	(5.3)	(2.7)	(11.3)	(8.1)
Net income	35.5	23.6	119.3	58.5
Net income attributable to noncontrolling interest	4.1	1.8	9.8	15.3
Net income attributable to Trinity Industries, Inc.	$ 31.4	$ 21.8	$ 109.5	$ 43.2
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.45	$ 0.30	$ 1.48	$ 0.63
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	(0.07)	(0.03)	(0.14)	(0.10)
Basic net income attributable to Trinity Industries, Inc.	0.38	0.27	1.34	0.53
Income (Loss) from Continuing Operations, Per Diluted Share	0.44	0.29	1.44	0.62
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	(0.07)	(0.03)	(0.13)	(0.10)
Diluted net income attributable to Trinity Industries, Inc.	$ 0.37	$ 0.26	$ 1.31	$ 0.52
Weighted average number of shares outstanding:
Weighted Average Number of Shares Outstanding, Basic	82.2	81.6	81.9	81.2
Weighted Average Number of Shares Outstanding, Diluted	84.1	83.5	83.9	83.5
Manufacturing
Revenues [Abstract]
Revenues	$ 509.6	$ 560.0	$ 1,595.8	$ 1,423.6
Cost of revenues:
Cost of revenues:	460.7	523.0	1,442.8	1,349.0
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	8.7	7.3	24.2	21.8
Leasing & Services
Revenues [Abstract]
Revenues	289.2	261.3	854.0	761.8
Cost of revenues:
Cost of revenues:	168.6	156.5	493.8	470.2
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	18.7	16.6	56.8	48.7
Corporate & other
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	$ 33.1	$ 25.2	$ 93.1	$ 82.8