Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues [Abstract]
Revenues	$ 472.7	$ 330.7
Cost of revenues:
Cost of revenues:	398.5	246.3
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	44.7	44.7
Gains on dispositions of property:
Lease portfolio sales	11.8	1.7
Other	13.5	9.8
Gains on dispositions of property:	25.3	11.5
Restructuring activities, net	0.0	(0.3)
Total operating profit	54.8	51.5
Other (income) expense:
Interest expense, net	43.5	51.3
Other Nonoperating Income	(1.6)	1.2
Other (income) expense:	41.9	52.5
Income (loss) from continuing operations before income taxes	12.9	(1.0)
Current Income Tax Expense (Benefit)	1.8	4.7
Provision (benefit) for deferred income taxes	1.2	(0.7)
Provision (benefit) for income taxes	3.0	4.0
Income (loss) from continuing operations	9.9	(5.0)
Income (loss) from discontinued operations, net of provision (benefit) for income taxes of $(2.0) and $2.3	(6.9)	6.3
Loss on sale of discontinued operations, net of benefit for income taxes of $0.4 and $—	(1.1)	0.0
Net income	1.9	1.3
Net income (loss) attributable to noncontrolling interest	2.6	(2.0)
Net income (loss) attributable to Trinity Industries, Inc.	$ (0.7)	$ 3.3
Basic earnings per common share:
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.09	$ (0.03)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	(0.10)	0.06
Basic net income (loss) attributable to Trinity Industries, Inc.	(0.01)	0.03
Income (Loss) from Continuing Operations, Per Diluted Share	0.09	(0.03)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	(0.10)	0.06
Diluted net income (loss) attributable to Trinity Industries, Inc.	$ (0.01)	$ 0.03
Weighted average number of shares outstanding:
Weighted Average Number of Shares Outstanding, Basic	82.9	110.2
Weighted Average Number of Shares Outstanding, Diluted	85.5	110.2
Manufacturing
Revenues [Abstract]
Revenues	$ 289.8	$ 147.4
Cost of revenues:
Cost of revenues:	295.6	149.6
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	9.7	8.6
Leasing
Revenues [Abstract]
Revenues	182.9	183.3
Cost of revenues:
Cost of revenues:	102.9	96.7
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	12.8	11.3
Other
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	$ 22.2	$ 24.8