Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2025		Dec. 31, 2024	Dec. 31, 2023
Revenues		$ 2,156.9		$ 3,079.2	$ 2,983.3
Cost of revenues:		1,584.2		2,411.0	2,456.2
Selling, engineering, and administrative expenses		214.3		235.7	201.9
Lease portfolio sales		91.4		57.3	82.8
Gain on divestiture of partially-owned leasing subsidiary		194.2	[1]	0.0	0.0
Gain (Loss) on Disposition of Other Assets		5.2		6.0	6.8
Gains on dispositions of property and other divestitures:		290.8		63.3	89.6
Restructuring activities, net		0.0		4.3	(2.2)
Total operating profit		649.2		491.5	417.0
Interest expense, net		274.2		273.5	265.5
Other, net		(0.4)		(3.8)	2.5
Other (income) expense:		273.8		269.7	268.0
Income from continuing operations before income taxes		375.4		221.8	149.0
Current Income Tax Expense (Benefit)		13.4		72.5	50.5
Provision (benefit) for deferred income taxes		77.5		(22.1)	(41.5)
Provision (benefit) for income taxes:		90.9		50.4	9.0
Income from continuing operations		284.5		171.4	140.0
Loss from discontinued operations, net of benefit for income taxes of $2.7, $4.1, and $3.6		(7.2)		(14.3)	(13.4)
Net income		277.3		157.1	126.6
Net income attributable to noncontrolling interest		24.2		18.7	20.6
Net income attributable to Trinity Industries, Inc.		$ 253.1		$ 138.4	$ 106.0
Income (Loss) from Continuing Operations, Per Basic Share		$ 3.22		$ 1.86	$ 1.47
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share		(0.09)		(0.17)	(0.16)
Earnings Per Share, Basic, Total	[2]	3.13		1.69	1.31
Income (Loss) from Continuing Operations, Per Diluted Share		3.14		1.81	1.43
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share		(0.09)		(0.17)	(0.16)
Earnings Per Share, Diluted, Total	[2]	$ 3.05		$ 1.64	$ 1.27
Basic weighted average shares outstanding		80.8		81.9	81.2
Diluted weighted average shares outstanding		82.9		84.2	83.4
Manufacturing [Member]
Revenues		$ 952.1		$ 1,938.4	$ 1,943.9
Cost of revenues:		864.1		1,748.2	1,827.5
Railcar Leasing and Services Group [Member]
Revenues		1,204.8		1,140.8	1,039.4
Cost of revenues:		$ 720.1		$ 662.8	$ 628.7

[1] Significant expense categories and amounts align with the segment-level information that is regularly provided to and reviewed by the CODM. Intersegment expenses are included within the amounts shown.

[2] 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.