Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenues [Abstract]
Revenues	$ 809.6	$ 641.7
Cost of revenues:
Cost of revenues:	644.9	538.5
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	52.3	49.9
Gains on dispositions of property:
Lease portfolio sales	2.1	13.5
Gain (Loss) on Disposition of Other Assets	0.7	1.8
Gains on dispositions of property:	2.8	15.3
Restructuring activities, net	0.0	(0.4)
Total operating profit	115.2	69.0
Other (income) expense:
Interest expense, net	69.1	62.1
Other Nonoperating Income	3.4	1.6
Other (income) expense:	72.5	63.7
Income from continuing operations before income taxes	42.7	5.3
Current Income Tax Expense (Benefit)	13.1	0.9
Provision (benefit) for deferred income taxes	(2.1)	(12.4)
Provision (benefit) for income taxes	11.0	(11.5)
Income from continuing operations	31.7	16.8
Loss from discontinued operations, net of benefit for income taxes of $1.3 and $0.8	(4.3)	(3.1)
Net income	27.4	13.7
Net income attributable to noncontrolling interest	3.7	9.3
Net income attributable to Trinity Industries, Inc.	$ 23.7	$ 4.4
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.34	$ 0.09
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	(0.05)	(0.04)
Basic net income attributable to Trinity Industries, Inc.	0.29	0.05
Income (Loss) from Continuing Operations, Per Diluted Share	0.33	0.09
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	(0.05)	(0.04)
Diluted net income attributable to Trinity Industries, Inc.	$ 0.28	$ 0.05
Weighted average number of shares outstanding:
Weighted Average Number of Shares Outstanding, Basic	81.6	80.8
Weighted Average Number of Shares Outstanding, Diluted	83.5	83.2
Manufacturing
Revenues [Abstract]
Revenues	$ 525.3	$ 409.0
Cost of revenues:
Cost of revenues:	476.3	391.9
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	7.7	7.0
Leasing & Services
Revenues [Abstract]
Revenues	284.3	232.7
Cost of revenues:
Cost of revenues:	168.6	146.6
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	18.1	16.9
Corporate & other
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	$ 26.5	$ 26.0