Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2026	Mar. 31, 2025
Revenues [Abstract]
Revenues		$ 492.0	$ 585.4
Cost of revenues:
Cost of revenues:		363.1	443.2
Selling, engineering, and administrative expenses
Selling, engineering, and administrative expenses		50.7	50.0
Gains on dispositions of property:
Gain (Loss) on Sale of Property, Plant and Equipment, Railroad Transportation Equipment		22.0	5.9
Gain (Loss) on Disposition of Other Assets		0.9	1.7
Gains on dispositions of property:		22.9	7.6
Total operating profit		101.1	99.8
Other (income) expense:
Interest expense, net		65.4	66.1
Other Nonoperating Income		0.6	(2.7)
Other (income) expense:		66.0	63.4
Income from continuing operations before income taxes		35.1	36.4
Provision for income taxes		8.5	7.4
Income from continuing operations		26.6	29.0
Loss from discontinued operations, net of benefit for income taxes of $0.6 and $0.6		(1.8)	(1.9)
Net income		24.8	27.1
Net income attributable to noncontrolling interest		0.6	5.0
Net income attributable to Trinity Industries, Inc.		$ 24.2	$ 22.1
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share		$ 0.33	$ 0.29
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share		(0.02)	(0.02)
Earnings Per Share, Basic, Total	[1]	0.30	0.27
Income (Loss) from Continuing Operations, Per Diluted Share		0.32	0.29
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share		(0.02)	(0.02)
Earnings Per Share, Diluted, Total	[1]	$ 0.30	$ 0.26
Weighted average number of shares outstanding:
Weighted Average Number of Shares Outstanding, Basic		79.7	81.6
Weighted Average Number of Shares Outstanding, Diluted		81.9	83.8
Manufacturing
Revenues [Abstract]
Revenues		$ 206.7	$ 298.2
Cost of revenues:
Cost of revenues:		180.7	271.6
Leasing & Services
Revenues [Abstract]
Revenues		285.3	287.2
Cost of revenues:
Cost of revenues:		$ 182.4	$ 171.6

[1] Note: Earnings per common share is calculated independently for each component and may not sum to total net income attributable to Trinity Industries, Inc. per common share due to rounding.