Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues [Abstract]
Revenues	$ 496.6	$ 419.8	$ 1,386.1	$ 1,043.8
Cost of revenues:
Cost of revenues:	395.3	337.4	1,119.4	785.8
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	48.0	45.8	137.7	136.7
Gains on dispositions of property:
Lease portfolio sales	34.3	32.9	73.0	45.7
Other	5.1	8.7	19.5	19.5
Gains on dispositions of property:	39.4	41.6	92.5	65.2
Restructuring activities, net	0.0	(0.1)	1.0	(1.1)
Total operating profit	92.7	78.3	220.5	187.6
Other (income) expense:
Interest expense, net	55.0	45.2	148.2	147.5
Loss on extinguishment of debt	0.0	0.0	1.5	11.7
Other Nonoperating Income	(0.6)	(0.7)	(2.7)	1.3
Other (income) expense:	54.4	44.5	147.0	160.5
Income from continuing operations before income taxes	38.3	33.8	73.5	27.1
Current Income Tax Expense (Benefit)	(2.6)	0.5	1.2	5.7
Provision (benefit) for deferred income taxes	11.2	7.8	16.2	3.7
Provision (benefit) for income taxes	8.6	8.3	17.4	9.4
Income from continuing operations	29.7	25.5	56.1	17.7
Income (loss) from discontinued operations, net of provision (benefit) for income taxes of $(1.0), $3.6, $(3.5), and $8.0	(3.4)	10.4	(13.7)	24.3
Loss on sale of discontinued operations, net of benefit for income taxes of $—, $—, $1.4, and $—	0.0	0.0	(5.7)	0.0
Net income	26.3	35.9	36.7	42.0
Net income (loss) attributable to noncontrolling interest	0.5	3.9	7.9	(6.0)
Net income attributable to Trinity Industries, Inc.	$ 25.8	$ 32.0	$ 28.8	$ 48.0
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.36	$ 0.22	$ 0.59	$ 0.23
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	(0.04)	0.11	(0.24)	0.23
Basic net income attributable to Trinity Industries, Inc.	0.32	0.33	0.35	0.46
Income (Loss) from Continuing Operations, Per Diluted Share	0.35	0.22	0.57	0.22
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	(0.04)	0.11	(0.23)	0.23
Diluted net income attributable to Trinity Industries, Inc.	$ 0.31	$ 0.33	$ 0.34	$ 0.45
Weighted average number of shares outstanding:
Weighted Average Number of Shares Outstanding, Basic	81.7	97.7	82.3	103.4
Weighted Average Number of Shares Outstanding, Diluted	83.3	99.5	84.4	105.7
Manufacturing
Revenues [Abstract]
Revenues	$ 302.0	$ 234.5	$ 813.5	$ 490.2
Cost of revenues:
Cost of revenues:	288.0	238.8	804.4	488.0
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	8.7	8.3	25.4	25.4
Leasing
Revenues [Abstract]
Revenues	194.6	185.3	572.6	553.6
Cost of revenues:
Cost of revenues:	107.3	98.6	315.0	297.8
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	14.2	11.6	39.6	36.1
Other
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	$ 25.1	$ 25.9	$ 72.7	$ 75.2