Trinity Industries (TRN) 10-Q 26 Oct 21 2021 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Oct. 19, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	1-6903
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	75-0225040
Entity Address, Address Line One	14221 N. Dallas Parkway, Suite 1100
Entity Address, City or Town	Dallas,
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75254-2957
City Area Code	214
Local Phone Number	631-4420
Title of 12(b) Security	Common Stock
Entity Trading Symbol	TRN
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		97,372,144
Entity Registrant Name	TRINITY INDUSTRIES INC
Entity Central Index Key	0000099780
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period	Q3
Current Fiscal Year End Date	--12-31

Consolidated Statements of Oper

Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues [Abstract]
Revenues	$ 503.5	$ 459.4	$ 1,273.8	$ 1,583.8
Cost of revenues:
Cost of revenues:	398.7	334.5	953.9	1,213.1
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	54.3	51.2	166.4	172.3
Gains on dispositions of property:
Lease portfolio sales (Note 1)	32.9	2.9	45.7	17.3
Other	8.7	1	19.5	2.8
Gains on dispositions of property:	41.6	3.9	65.2	20.1
Impairment of long-lived assets	0	0	0	369.4
Restructuring activities, net	(0.1)	4.7	(1.1)	10.5
Total operating profit (loss)	92.2	72.9	219.8	(161.4)
Other (income) expense:
Interest expense, net	45.2	51.7	147.5	158.6
Loss on extinguishment of debt	0	0	11.7	5
Other Nonoperating Income	(0.7)	2	1.3	0.5
Other (income) expense:	44.5	53.7	160.5	164.1
Income (loss) from continuing operations before income taxes	47.7	19.2	59.3	(325.5)
Current Income Tax Expense (Benefit)	0.6	(18.7)	5.9	(471.2)
Provision for deferred income taxes	10.8	12	10.6	245.1
Provision (benefit) for income taxes	11.4	(6.7)	16.5	(226.1)
Income (loss) from continuing operations	36.3	25.9	42.8	(99.4)
Loss from discontinued operations, net of provision (benefit) for income taxes of $0.4, $—, $0.8, and $(0.1)	(0.4)	0	(0.8)	(0.2)
Net income (loss)	35.9	25.9	42	(99.6)
Net income (loss) attributable to noncontrolling interest	3.9	0.8	(6)	(79.5)
Net income (loss) attributable to Trinity Industries, Inc.	$ 32	$ 25.1	$ 48	$ (20.1)
Basic earnings per common share:
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.33	$ 0.21	$ 0.47	$ (0.17)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0	0	(0.01)	0
Basic net income (loss) attributable to Trinity Industries, Inc.	0.33	0.21	0.46	(0.17)
Income (Loss) from Continuing Operations, Per Diluted Share	0.33	0.21	0.46	(0.17)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0	0	(0.01)	0
Diluted net income (loss) attributable to Trinity Industries, Inc.	$ 0.33	$ 0.21	$ 0.45	$ (0.17)
Weighted average number of shares outstanding:
Weighted Average Number of Shares Outstanding, Basic	97.7	116.4	103.4	117.2
Weighted Average Number of Shares Outstanding, Diluted	99.5	117	105.7	117.2
Manufacturing
Revenues [Abstract]
Revenues	$ 318.2	$ 275.7	$ 720.2	$ 971.4
Cost of revenues:
Cost of revenues:	300.1	248.1	656.1	885.2
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	18.8	18.5	56.6	60
Leasing
Revenues [Abstract]
Revenues	185.3	183.7	553.6	612.4
Cost of revenues:
Cost of revenues:	98.6	86.4	297.8	327.9
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	11.6	11.7	36.1	39
Other
Selling, engineering, and administrative expenses:
Selling, engineering, and administrative expenses:	$ 23.9	$ 21	$ 73.7	$ 73.3

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 35.9	$ 25.9	$ 42	$ (99.6)
Derivative financial instruments:
Unrealized gains (losses) arising during the period, net of tax benefit (expense) of $0.2, $(0.6), $(1.5), and $7.6	(0.8)	2	5	(25.3)
Reclassification adjustments for losses included in net income, net of tax benefit of $0.3, $1.3, $0.6, and $3.0	1.8	4.7	2.9	10.6
Defined benefit plans:
Amortization of prior service cost, net of tax benefit of $—, $0.1, $—, and $0.3	0	0.2	0	0.6
Amortization of net actuarial losses, net of tax benefit of $—, $0.3, $0.1, and $0.9	0	1.2	0.1	3.6
Other Comprehensive Income (Loss), Net of Tax, Total	1	8.1	8	(10.5)
Comprehensive income (loss)	36.9	34	50	(110.1)
Less: comprehensive income (loss) attributable to noncontrolling interest	4.2	1.1	(5)	(78.6)
Comprehensive income (loss) attributable to Trinity Industries, Inc.	$ 32.7	$ 32.9	$ 55	$ (31.5)

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) shares in Millions, $ in Millions	Sep. 30, 2021	Dec. 31, 2020
ASSETS
Cash and cash equivalents	$ 221.8	$ 132
Receivables, net of allowance	246.3	199
Income tax receivable	191.9	445.8
Inventories:
Raw materials and supplies	240.5	176.4
Work in process	80.3	52.2
Finished goods	82.7	92.6
Inventory, Net	403.5	321.2
Restricted cash, including partially-owned subsidiaries of $42.2 and $31.1	123.3	96.4
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,940.9 and $1,931.6	9,097.7	9,193
Less accumulated depreciation, including partially-owned subsidiaries of $561.4 and $525.7	2,297.6	2,189.6
Property, Plant and Equipment, Net	6,800.1	7,003.4
Goodwill	215.8	208.8
Other assets	292.9	295.2
Total assets	8,495.6	8,701.8
Liabilities and Equity [Abstract]
Accounts payable	208.6	156.4
Accrued liabilities	296.4	314.7
Debt:
Recourse	398.5	448.2
Non-Recourse Debt	4,778	4,568.8
Total debt	5,176.5	5,017
Deferred income taxes	1,060.3	1,047.5
Other liabilities	157.4	150.2
Total liabilities	$ 6,899.2	$ 6,685.8
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred Stock, Shares Authorized	1.5	1.5
Preferred Stock, Shares Subscribed but Unissued	1.5	1.5
Preferred stock – 1.5 shares authorized and unissued	$ 0	$ 0
Common Stock, Shares Authorized	400	400
Common stock – 400.0 shares authorized	$ 1	$ 1.1
Capital in excess of par value	6.9	0
Retained earnings	1,425.2	1,769.4
Accumulated other comprehensive loss	(23.9)	(30.9)
Treasury stock	(78.2)	(0.8)
Total Equity	1,331	1,738.8
Noncontrolling interest	265.4	277.2
Total stockholders' equity	1,596.4	2,016
Total liabilities and stockholders' equity	8,495.6	8,701.8
Partially-owned subsidiaries
Inventories:
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,940.9 and $1,931.6	1,940.9	1,931.6
Less accumulated depreciation, including partially-owned subsidiaries of $561.4 and $525.7	561.4	525.7
Debt:
Non-Recourse Debt	1,224.5	1,228.3
Wholly-owned subsidiaries
Debt:
Non-Recourse Debt	$ 3,553.5	$ 3,340.5

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net income (loss)	$ 42	$ (99.6)
Loss from discontinued operations, net of income taxes	(0.8)	(0.2)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	206.3	199.5
Stock-based compensation expense	16.3	19.7
Provision for deferred income taxes	10.6	245.1
Net gains on lease portfolio sales	(45.7)	(17.3)
Gains on dispositions of property and other assets	(16.4)	(6.3)
Gains on insurance recoveries from property damage	(4.7)	0
Impairment of long-lived assets	0	369.4
Non-cash impact of restructuring activities	0	5.9
Non-cash interest expense	10.3	9.5
Loss on extinguishment of debt	11.7	5
Other	7	2.1
Changes in operating assets and liabilities:
(Increase) decrease in receivables	(51)	40.1
(Increase) decrease in income tax receivable	249.8	(470.3)
(Increase) decrease in inventories	(86)	60.3
(Increase) decrease in other assets	6.7	142
Increase (decrease) in accounts payable	51.2	(28.9)
Increase (decrease) in accrued liabilities	18.7	(18.8)
Increase (decrease) in other liabilities	0.4	(0.8)
Net cash provided by operating activities – continuing operations	428	456.8
Net cash used in operating activities – discontinued operations	(0.8)	(0.2)
Net cash provided by operating activities	427.2	456.6
Investing activities:
Proceeds from dispositions of property and other assets	34.4	19.8
Lease portfolio sales	404.5
Proceeds from Sales of Railcars Owned More Than One Year at the Time of Sale		138.7
Payments to Acquire Equipment on Lease	363.9
Capital expenditures – leasing (net of sold lease fleet railcars owned one year or less with a net cost of $54.0 for the nine months ended September 30, 2020)		448.8
Capital expenditures – manufacturing and other	(21.5)	(70.7)
Acquisitions, net of cash acquired	(16.5)	0
Proceeds from insurance recoveries	6.5	0
Other	0.1	0
Net cash provided by (used in) investing activities	43.6	(361)
Financing activities:
Payments to retire debt	(2,256.8)	(795.5)
Proceeds from issuance of debt	2,393.7	835.8
Shares repurchased	(406.5)	(120.4)
Dividends paid to common shareholders	(68.5)	(67.8)
Purchase of shares to satisfy employee tax on vested stock	(9.2)	(9.3)
Contributions from (distributions to) noncontrolling interest	(6.8)	6.1
Other	0	(0.2)
Net cash used in financing activities	(354.1)	(151.3)
Net increase (decrease) in cash, cash equivalents, and restricted cash	116.7	(55.7)
Cash, cash equivalents, and restricted cash at beginning of period	228.4	277.6
Cash, cash equivalents, and restricted cash at end of period	$ 345.1	$ 221.9

Consolidated Statement of Stock

Consolidated Statement of Stockholders' Equity (unaudited) - USD ($) $ in Millions		Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Capital in Excess of Par Value	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Treasury Stock	Trinity Stockholders’ Equity	Trinity Stockholders’ EquityCumulative Effect, Period of Adoption, Adjustment	Noncontrolling Interest
Common Stock, Shares, Issued				(119,700,000)					(100,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Dec. 31, 2019		$ 2,378.9		$ 1.2	$ 0	$ 2,182.9		$ (153.1)	$ (0.9)	$ 2,030.1		$ 348.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		162.3				161.7				161.7		0.6
Other comprehensive income		(23.2)						(23.5)		(23.5)		0.3
Cash dividends declared on common stock (1)	[1]	(24.6)				(24.6)				(24.6)
Stock-based compensation expense		7.3			7.3					7.3
Shares repurchased									(1,900,000)
Shares repurchased		(35.4)							$ (35.4)	(35.4)
Settlement of share-based awards, net		(0.2)			0.7				(0.9)	(0.2)
Cumulative effect of adopting new accounting standard			$ 0.5				$ 0.5				$ 0.5
Other		(0.5)				0.5				0.5
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Mar. 31, 2020		$ 2,466.1		1.2	8	2,321		(176.6)	(37.2)	2,116.4		349.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared		$ 0.19
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Dec. 31, 2019		$ 2,378.9		1.2	0	2,182.9		(153.1)	$ (0.9)	2,030.1		348.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(99.6)
Other comprehensive income		(10.5)
Stock-based compensation expense		19.7
Shares repurchased									(6,300,000)
Shares repurchased									$ (125.3)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2020		2,093.6		$ 1.2	5.3	2,066.8		(164.5)	$ (91.5)	1,817.3		276.3
Common Stock, Shares, Issued				(119,700,000)					(2,000,000)
Restricted shares, net, (in shares)									(600,000)
Treasury Stock, Shares, Retired				(2,500,000)					(2,500,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Mar. 31, 2020		2,466.1		$ 1.2	8	2,321		(176.6)	$ (37.2)	2,116.4		349.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(287.8)				(206.9)				(206.9)		(80.9)
Other comprehensive income		4.6						4.3		4.3		0.3
Cash dividends declared on common stock (1)	[1]	(20.6)				(20.6)				(20.6)
Stock-based compensation expense		7.6			7.6					7.6
Settlement of share-based awards, net		(9.5)		1.5	1.9				(11.4)	(9.5)
Retirement of treasury stock		0			(17.5)	(30.2)			(47.7)	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Jun. 30, 2020		$ 2,160.4		$ 1.2	0	2,063.3		(172.3)	$ (0.9)	1,891.3		269.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared		$ 0.19
$0.01 Par Value		$ 0.01
Common Stock, Shares, Issued				(118,700,000)					(100,000)
Restricted shares, net, (in shares)									0
Net income (loss)		$ 25.9				25.1				25.1		0.8
Other comprehensive income		8.1						7.8		7.8		0.3
Cash dividends declared on common stock (1)	[1]	(21.6)				(21.6)				(21.6)
Stock-based compensation expense		4.8			4.8					4.8
Shares repurchased									(4,500,000)
Shares repurchased		(89.9)			0				$ (89.9)	(89.9)
Settlement of share-based awards, net		(0.2)			0.5				(0.7)	(0.2)
Contributions from noncontrolling interest		6.1										6.1
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2020		$ 2,093.6		$ 1.2	5.3	2,066.8		(164.5)	$ (91.5)	1,817.3		276.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared		$ 0.19
$0.01 Par Value		$ 0.01
Common Stock, Shares, Issued				(118,700,000)					(4,600,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Dec. 31, 2020		$ 2,016		$ 1.1	0	1,769.4		(30.9)	$ (0.8)	1,738.8		277.2
Common Stock, Shares, Issued				(111,200,000)					100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		1.3				3.3				3.3		(2)
Other comprehensive income		5.4						5.1		5.1		0.3
Cash dividends declared on common stock (1)	[2]	(23.3)				(23.3)				(23.3)
Stock-based compensation expense		5.4			5.4					5.4
Shares repurchased									(1,300,000)
Shares repurchased		(36.8)							$ (36.8)	(36.8)
Settlement of share-based awards, net		(0.1)			0.7				(0.8)	(0.1)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Mar. 31, 2021		$ 1,967.9		$ 1.1	6.1	1,749.4		(25.8)	(38.4)	1,692.4		275.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared		$ 0.21
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Dec. 31, 2020		$ 2,016		1.1	0	1,769.4		(30.9)	$ (0.8)	1,738.8		277.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		42
Other comprehensive income		8										1
Stock-based compensation expense		16.3
Shares repurchased									(14,600,000)
Shares repurchased									$ (404.7)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2021		1,596.4		$ 1	6.9	1,425.2		(23.9)	$ (78.2)	1,331		265.4
Common Stock, Shares, Issued				(111,200,000)					1,400,000
Restricted shares, net, (in shares)				(1,100,000)					(300,000)
Treasury Stock, Shares, Retired				(12,200,000)					(12,200,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Mar. 31, 2021		1,967.9		$ 1.1	6.1	1,749.4		(25.8)	$ (38.4)	1,692.4		275.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		4.8				12.7				12.7		(7.9)
Other comprehensive income		1.6						1.2		1.2		0.4
Cash dividends declared on common stock (1)	[2]	(21)				(21)				(21)
Stock-based compensation expense		4.4			4.4					4.4
Shares repurchased									(10,500,000)
Shares repurchased		(290.8)							$ (290.8)	(290.8)
Settlement of share-based awards, net		(9)			0.1				(9.1)	(9)
Retirement of treasury stock		0		(0.1)	(10.6)	(327)			(337.7)	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Jun. 30, 2021		$ 1,657.9		$ 1	0	1,414.1		(24.6)	$ (0.6)	1,389.9		268
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared		$ 0.21
$0.01 Par Value		$ 0.01
Common Stock, Shares, Issued				(100,100,000)					0
Restricted shares, net, (in shares)				(100,000)					(100,000)
Net income (loss)		$ 35.9				32				32		3.9
Other comprehensive income		1						0.7		0.7		0.3
Cash dividends declared on common stock (1)		(20.9)				(20.9)				(20.9)
Stock-based compensation expense		6.5			6.5					6.5
Shares repurchased									(2,815,307)
Shares repurchased		(77.1)							$ (77.1)	(77.1)
Settlement of share-based awards, net		(0.1)			0.4				(0.5)	(0.1)
Distributions to noncontrolling interest		(6.8)										(6.8)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2021		$ 1,596.4		$ 1	$ 6.9	$ 1,425.2		$ (23.9)	$ (78.2)	$ 1,331		$ 265.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared		$ 0.21
$0.01 Par Value		$ 0.01
Common Stock, Shares, Issued				(100,200,000)					2,900,000
[1]	Dividends of $0.19 per common share for all periods presented in 2020.
[2]	Dividends of $0.21 per common share for all periods presented in 2021.

Consolidated Statements of Op_2

Consolidated Statements of Operations Parenthetical - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Discontinued Operation, Tax Effect of Discontinued Operation	$ 0.4	$ 0	$ 0.8	$ (0.1)

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income Parenthetical - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	$ 0.2	$ (0.6)	$ (1.5)	$ 7.6
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	(0.3)	(1.3)	(0.6)	(3)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax	0	(0.1)	0	(0.3)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax	$ 0	$ (0.3)	$ (0.1)	$ (0.9)

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows Parenthetical $ in Millions	9 Months Ended
	Sep. 30, 2020USD ($)
Statement of Cash Flows [Abstract]
Payments to Acquire Leasing Assets Net of Sold Railcars Owned One Year or Less Net Cost	$ 54

Accounting Policies

Accounting Policies	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Lessor, Operating Leases	The following table summarizes the impact of our leases on our Consolidated Statements of Operations: Three Months Ended Nine Months Ended 2021 2020 2021 2020 (in millions) Operating lease revenues $ 158.2 $ 169.1 $ 486.2 $ 506.4 Variable operating lease revenues $ 18.8 $ 9.0 $ 44.7 $ 32.2
Lessee, Operating Leases	The following table summarizes the impact of our operating leases on our Consolidated Financial Statements (in millions, except lease term and discount rate): Three Months Ended Nine Months Ended 2021 2020 2021 2020 Consolidated Statements of Operations Operating lease expense $ 4.2 $ 3.7 $ 12.1 $ 12.2 Short-term lease expense $ — $ 0.7 $ 0.2 $ 2.1 September 30, 2021 December 31, 2020 Consolidated Balance Sheets Right-of-use assets (1) $ 92.2 $ 77.1 Lease liabilities (2) $ 116.2 $ 96.9 Weighted average remaining lease term 10.5 years 11.3 years Weighted average discount rate 3.0 % 3.3 % Nine Months Ended 2021 2020 Consolidated Statements of Cash Flows Cash flows from operating activities $ 12.1 $ 12.2 Right-of-use assets recognized in exchange for new lease liabilities (3) $ 26.6 $ 53.6 (1) Included in other assets in our Consolidated Balance Sheets. (2) Included in other liabilities in our Consolidated Balance Sheets. (3) Includes the commencement of the new headquarters facility for the nine months ended September 30, 2020.

Derivative Instruments and Fair

Derivative Instruments and Fair Value Accounting	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Accounting	Note 2. Derivative Instruments and Fair Value Accounting Derivative Instruments We use derivative instruments to mitigate the impact of changes in interest rates, both in anticipation of future debt issuances and to offset interest rate variability of certain floating rate debt issuances outstanding. We also may use derivative instruments to mitigate the impact of changes in natural gas and diesel fuel prices and changes in foreign currency exchange rates. Derivative instruments that are designated and qualify as cash flow hedges are accounted for by recording the effective portion of the gain or loss on the derivative instrument in accumulated other comprehensive loss ("AOCL") as a separate component of stockholders' equity and reclassified into earnings in the period during which the hedged transaction affects earnings. We continuously monitor our derivative positions and the credit ratings of our counterparties and do not anticipate losses due to non-performance. See Note 7 for a description of our debt instruments. Interest Rate Hedges Included in accompanying balance sheet at September 30, 2021 AOCL – loss/(income) Notional Amount Interest Rate (1) Asset/(Liability) Controlling Interest Noncontrolling Interest (in millions, except %) Expired hedges: 2018 secured railcar equipment notes $ 249.3 4.41 % $ — $ 0.7 $ — TRIP Holdings warehouse loan $ 788.5 3.60 % $ — $ 0.7 $ 1.0 2017 promissory notes – interest rate cap $ 169.3 3.00 % $ — $ (0.4) $ — Open hedge: 2017 promissory notes – interest rate swap $ 468.0 2.66 % $ (28.9) $ 28.5 $ — (1) Weighted average fixed interest rate, except for the interest rate cap on the 2017 promissory notes. Effect on interest expense – increase/(decrease) Three Months Ended Nine Months Ended Expected effect during next twelve months 2021 2020 2021 2020 (in millions) Expired hedges: 2006 secured railcar equipment notes $ — $ — $ — $ (0.1) $ — 2018 secured railcar equipment notes $ 0.1 $ 0.1 $ 0.2 $ 0.2 $ 0.2 TRIP Holdings warehouse loan $ 0.4 $ 0.5 $ 1.4 $ 1.5 $ 1.4 Triumph Rail secured railcar equipment notes $ — $ 0.1 $ 0.1 $ 0.2 $ — 2017 promissory notes – interest rate cap $ (0.1) $ (0.1) $ (0.1) $ (0.1) $ (0.1) Open hedge (1) : 2017 promissory notes – interest rate swap $ 3.1 $ 3.1 $ 9.3 $ 7.8 $ 12.4 (1) Based on the fair value of open hedges as of September 30, 2021. Other Derivatives Our exposure related to foreign currency transactions is currently hedged for up to a maximum of twelve months. The effect of commodity hedge transactions was immaterial to the Consolidated Financial Statements for all periods presented herein. Information related to our foreign currency hedge is as follows: Included in accompanying balance sheet at September 30, 2021 Effect on cost of revenues – increase/(decrease) Notional Asset/(Liability) AOCL – Three Months Ended Nine Months Ended Expected effect during next twelve months (1) 2021 2020 2021 2020 (in millions) $ 60.0 $ (0.9) $ 0.6 $ (1.4) $ 2.3 $ (7.4) $ 4.1 $ 0.6 (1) Based on the fair value of open hedges as of September 30, 2021. Fair Value Measurements Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for that asset or liability in an orderly transaction between market participants on the measurement date. An entity is required to establish a fair value hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value. The three levels of inputs that may be used to measure fair value are listed below. Level 1 – This level is defined as quoted prices in active markets for identical assets or liabilities. Our cash equivalents and restricted cash are instruments of the U.S. Treasury or highly-rated money market mutual funds. The assets measured as Level 1 in the fair value hierarchy are summarized below: Level 1 September 30, 2021 December 31, 2020 (in millions) Assets: Cash equivalents $ 8.4 $ 24.2 Restricted cash 123.3 96.4 Total assets $ 131.7 $ 120.6 Level 2 – This level is defined as observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Interest rate hedges are valued at exit prices obtained from each counterparty. Foreign currency hedges are valued at exit prices obtained from each counterparty, which are based on currency spot and forward rates and forward points. The assets and liabilities measured as Level 2 in the fair value hierarchy are summarized below: Level 2 September 30, 2021 December 31, 2020 (in millions) Assets: Foreign currency hedge (1) $ — $ 4.8 Total assets $ — $ 4.8 Liabilities: Interest rate hedge (2) $ 28.9 $ 45.2 Foreign currency hedge (2) 0.9 — Total liabilities $ 29.8 $ 45.2 (1) Included in other assets in our Consolidated Balance Sheets. (2) Included in accrued liabilities in our Consolidated Balance Sheets. Level 3 – This level is defined as unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. As of September 30, 2021 and December 31, 2020, we have no assets measured as Level 3 in the fair value hierarchy. See Note 10 for information regarding the non-recurring fair value measurement considerations during the nine months ended September 30, 2020 for the impairment charge related to our small cube covered hopper railcars. See Note 7 for the estimated fair values of our debt instruments. The fair values of all other financial instruments are estimated to approximate carrying value.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Segment Information	Segment Information We report our operating results in three principal business segments: (1) the Railcar Leasing and Management Services Group, which owns and operates a fleet of railcars and provides third-party fleet leasing, management, and administrative services; (2) the Rail Products Group, which manufactures and sells railcars and related parts and components, and provides railcar maintenance and modification services; and (3) All Other, which includes our highway products business and legal, environmental, and maintenance costs associated with non-operating facilities. Gains and losses from the sale of property, plant, and equipment are included in the operating profit of each respective segment. Our Chief Operating Decision Maker ("CODM") regularly reviews the operating results of our reportable segments in order to assess performance and allocate resources. Our CODM does not consider impairment of long-lived assets or restructuring activities when evaluating segment operating results; therefore, impairment of long-lived assets and restructuring activities are not allocated to segment profit or loss. Sales and related net profits ("deferred profit") from the Rail Products Group to the Leasing Group are recorded in the Rail Products Group and eliminated in consolidation and are reflected in "Eliminations – Lease Subsidiary" in the tables below. Sales between these groups are recorded at prices comparable to those charged to external customers, taking into consideration quantity, features, and production demand. Amortization of deferred profit on railcars sold to the Leasing Group is included in the operating profit of the Leasing Group, resulting in the recognition of depreciation expense based on our original manufacturing cost of the railcars. Lease portfolio sales are included in the Leasing Group, with related gains and losses computed based on the net book value of the original manufacturing cost of the railcars. The financial information for these segments is shown in the tables below (in millions). We operate principally in North America. Three Months Ended September 30, 2021 Railcar Leasing and Management Services Group Rail Products Group All Other Eliminations – Lease Subsidiary Eliminations – Other Consolidated Total External Revenue $ 185.3 $ 234.5 $ 83.7 $ — $ — $ 503.5 Intersegment Revenue 0.2 105.4 — (105.3) (0.3) — Total Revenues $ 185.5 $ 339.9 $ 83.7 $ (105.3) $ (0.3) $ 503.5 Three Months Ended September 30, 2020 Railcar Leasing and Management Services Group Rail Products Group All Other Eliminations – Lease Subsidiary Eliminations – Other Consolidated Total External Revenue $ 183.7 $ 213.1 $ 62.6 $ — $ — $ 459.4 Intersegment Revenue 0.2 168.1 — (166.0) (2.3) — Total Revenues $ 183.9 $ 381.2 $ 62.6 $ (166.0) $ (2.3) $ 459.4 Nine Months Ended September 30, 2021 Railcar Leasing and Management Services Group Rail Products Group All Other Eliminations – Lease Subsidiary Eliminations – Other Consolidated Total External Revenue $ 553.6 $ 490.2 $ 230.0 $ — $ — $ 1,273.8 Intersegment Revenue 0.5 372.5 — (367.6) (5.4) — Total Revenues $ 554.1 $ 862.7 $ 230.0 $ (367.6) $ (5.4) $ 1,273.8 Nine Months Ended September 30, 2020 Railcar Leasing and Management Services Group Rail Products Group All Other Eliminations – Lease Subsidiary Eliminations – Other Consolidated Total External Revenue $ 612.4 $ 777.6 $ 193.8 $ — $ — $ 1,583.8 Intersegment Revenue 0.6 518.6 1.5 (512.4) (8.3) — Total Revenues $ 613.0 $ 1,296.2 $ 195.3 $ (512.4) $ (8.3) $ 1,583.8 The reconciliation of segment operating profit (loss) to consolidated net income (loss) is as follows: Three Months Ended Nine Months Ended September 30, 2021 2020 2021 2020 (in millions) Operating profit (loss): Railcar Leasing and Management Services Group $ 109.3 $ 89.7 $ 268.7 $ 265.5 Rail Products Group (3.1) 3.2 (8.7) 36.2 All Other 14.7 7.3 42.8 23.9 Segment Totals before Eliminations, Corporate Expenses, Impairment of long-lived assets, and Restructuring activities 120.9 100.2 302.8 325.6 Corporate (23.9) (21.0) (73.7) (73.3) Impairment of long-lived assets — — — (369.4) Restructuring activities, net 0.1 (4.7) 1.1 (10.5) Eliminations – Lease Subsidiary (4.5) (2.6) (9.3) (33.5) Eliminations – Other (0.4) 1.0 (1.1) (0.3) Consolidated operating profit (loss) 92.2 72.9 219.8 (161.4) Other (income) expense 44.5 53.7 160.5 164.1 Provision (benefit) for income taxes 11.4 (6.7) 16.5 (226.1) Loss from discontinued operations, net of income taxes (0.4) — (0.8) (0.2) Net income (loss) $ 35.9 $ 25.9 $ 42.0 $ (99.6)

Partially-Owned Leasing Subsidi

Partially-Owned Leasing Subsidiaries	9 Months Ended
	Sep. 30, 2021
Noncontrolling Interest [Abstract]
Partially-Owned Leasing Subsidiaries	Partially-Owned Leasing Subsidiaries Through our wholly-owned subsidiary, Trinity Industries Leasing Company ("TILC"), we formed two subsidiaries, TRIP Holdings and RIV 2013, for the purpose of providing railcar leasing services in North America for institutional investors. Each of TRIP Holdings and RIV 2013 are direct, partially-owned subsidiaries of TILC in which we have a controlling interest. Each is governed by a seven-member board of representatives, two of whom are designated by TILC. TILC is the agent of each of TRIP Holdings and RIV 2013 and, as such, has been delegated the authority, power, and discretion to take certain actions on behalf of the respective companies. At September 30, 2021, the carrying value of our investment in TRIP Holdings and RIV 2013 totaled $139.5 million. Our weighted average ownership interest in TRIP Holdings and RIV 2013 is 38% while the remaining 62% weighted average interest is owned by third-party, investor-owned funds. The investment in our partially-owned leasing subsidiaries is eliminated in consolidation. Each of TRIP Holdings and RIV 2013 has wholly-owned subsidiaries that are the owners of railcars acquired from our Rail Products and Leasing Groups. TRIP Holdings has wholly-owned subsidiaries known as Triumph Rail LLC ("Triumph Rail"), formerly known as TRIP Master Funding LLC ("TRIP Master Funding”), and TRIP Railcar Co. LLC ("TRIP Railcar Co."). RIV 2013 has a wholly owned-subsidiary known as TRP 2021 LLC ("TRP-2021"), formerly known as Trinity Rail Leasing 2012 LLC (“TRL-2012”). TILC is the contractual servicer for Triumph Rail, TRIP Railcar Co., and TRP-2021, with the authority to manage and service each entity's owned railcars. Our controlling interest in each of TRIP Holdings and RIV 2013 results from our combined role as both equity member and agent/servicer. The noncontrolling interest included in the accompanying Consolidated Balance Sheets represents the non-Trinity equity interest in these partially-owned subsidiaries. Trinity has no obligation to guarantee performance under any of our partially-owned subsidiaries' (or their respective subsidiaries') debt agreements, guarantee any railcar residual values, shield any parties from losses or guarantee minimum yields. The assets of each of Triumph Rail, TRIP Railcar Co., and TRP-2021 may only be used to satisfy the particular subsidiary's liabilities, and the creditors of each of Triumph Rail, TRIP Railcar Co., and TRP-2021 have recourse only to the particular subsidiary's assets. Each of TILC and the third-party equity investors receive distributions from TRIP Holdings and RIV 2013, when available, in proportion to its respective equity interests, and has an interest in the net assets of the partially-owned subsidiaries upon a liquidation event in the same proportion. TILC is paid fees for the services it provides to Triumph Rail, TRIP Railcar Co., and TRP-2021 and has the potential to earn certain incentive fees. There are no remaining equity commitments with respect to TRIP Holdings or RIV 2013. See Note 7 regarding TRIP Holdings and RIV 2013, including the redemption and refinancing of the debt of their respective subsidiaries. Investment in Unconsolidated Affiliate In August 2021, the Company and Wafra, Inc. (“Wafra”), a global alternative investment manager, announced a new railcar investment vehicle (“RIV”) program between Trinity and certain funds managed by Wafra (“Wafra Funds”). As part of this program, a joint venture was formed, Signal Rail Holdings LLC (“Signal Rail”), which is owned 90% by Wafra Funds and 10% by TILC. Signal Rail or its subsidiaries are expected to invest in diversified portfolios of leased railcars originated by TILC targeting up to $1 billion in total acquisitions over an expected three-year investment period. TILC will service all railcars owned by Signal Rail. In connection with the launch of the RIV program, in August 2021, TILC and certain of its subsidiaries sold an initial portfolio of 3,582 railcars and related leases to Signal Rail for an aggregate sales price of approximately $325.1 million. As a result of the sale, TILC received approximately $318.7 million in cash, of which $2.9 million was recognized as revenue for services performed associated with the delivery of railcars with attached leases. Additionally, in connection with the sale, TILC received a 10% equity interest in Signal Rail valued at $6.4 million, which was primarily received in exchange for its contribution of railcars to Signal Rail. TILC recognized a gain of approximately $32.9 million on the initial portfolio sale during the three months ended September 30, 2021 and will earn on-going fee revenue from servicing these railcars. Signal Rail financed this purchase primarily through an asset-backed securitization. In the event of future railcar portfolio sales, we expect that Signal Rail would issue additional debt, and Wafra Funds and TILC would make additional equity contributions to Signal Rail such that TILC would maintain its 10% equity interest. Upon consideration under the variable interest entity (“VIE”) model of ASC 810, Trinity has concluded that Signal Rail meets the definition of a VIE. TILC has variable interests in Signal Rail arising from its 10% equity ownership position and its role as a service provider. We have evaluated the potential for consolidation using the variable interest model and have determined that Trinity is not required to consolidate this entity as we do not have the power to direct the activities of the entity that most significantly impact its economic performance. We will absorb portions of Signal Rail’s expected losses and/or receive portions of expected residual returns commensurate with our 10% equity interest in Signal Rail. Our investment in Signal Rail is being accounted for under the equity method of accounting. At September 30, 2021, the carrying value of TILC’s equity investment in Signal Rail was $6.1 million, which is included in other assets in our Consolidated Balance Sheet. The carrying value of this investment, together with any potential future funding commitments described above, collectively represent our maximum exposure in Signal Rail.

Railcar Leasing and Management

Railcar Leasing and Management Services Group	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Railcar Leasing and Management Services Group	Railcar Leasing and Management Services Group The Railcar Leasing and Management Services Group owns and operates a fleet of railcars as well as provides third-party fleet leasing, management, and administrative services. Selected consolidated financial information for the Leasing Group is as follows: September 30, 2021 Wholly- Partially-Owned Subsidiaries Total Leasing Group Eliminations – Lease Subsidiary (1) Adjusted Total Leasing Group (in millions) Cash and cash equivalents $ 2.6 $ — $ 2.6 $ — $ 2.6 Accounts receivable 101.9 11.4 113.3 — 113.3 Property, plant, and equipment, net 5,603.4 1,594.7 7,198.1 (782.6) 6,415.5 Restricted cash 81.1 42.2 123.3 — 123.3 Other assets 63.3 1.3 64.6 — 64.6 Total assets $ 5,852.3 $ 1,649.6 $ 7,501.9 $ (782.6) $ 6,719.3 Accounts payable and accrued liabilities $ 137.7 $ 33.7 $ 171.4 $ — $ 171.4 Debt, net 3,553.5 1,224.5 4,778.0 — 4,778.0 Deferred income taxes 1,087.4 1.1 1,088.5 (180.2) 908.3 Other liabilities 39.1 — 39.1 — 39.1 Total liabilities 4,817.7 1,259.3 6,077.0 (180.2) 5,896.8 Noncontrolling interest — 265.4 265.4 — 265.4 Total Equity $ 1,034.6 $ 124.9 $ 1,159.5 $ (602.4) $ 557.1 December 31, 2020 Wholly- Partially-Owned Subsidiaries Total Leasing Group Eliminations – Lease Subsidiary (1) Adjusted Total Leasing Group (in millions) Cash and cash equivalents $ 3.5 $ — $ 3.5 $ — $ 3.5 Accounts receivable 82.0 8.4 90.4 — 90.4 Property, plant, and equipment, net 5,795.9 1,626.3 7,422.2 (820.3) 6,601.9 Restricted cash 65.2 31.1 96.3 — 96.3 Other assets 38.1 1.6 39.7 — 39.7 Total assets $ 5,984.7 $ 1,667.4 $ 7,652.1 $ (820.3) $ 6,831.8 Accounts payable and accrued liabilities $ 141.4 $ 30.9 $ 172.3 $ — $ 172.3 Debt, net 3,340.5 1,228.3 4,568.8 — 4,568.8 Deferred income taxes 1,062.3 1.1 1,063.4 (186.2) 877.2 Other liabilities 25.7 — 25.7 — 25.7 Total liabilities 4,569.9 1,260.3 5,830.2 (186.2) 5,644.0 Noncontrolling interest — 277.2 277.2 — 277.2 Total Equity $ 1,414.8 $ 129.9 $ 1,544.7 $ (634.1) $ 910.6 (1) Net deferred profit on railcars sold to the Leasing Group consists of intersegment profit that is eliminated in consolidation. Net deferred profit and the related deferred tax impact are included as adjustments to the property, plant, and equipment, net and deferred income taxes line items, respectively, in the Eliminations – Lease Subsidiary column above to reflect the net book value of the railcars purchased by the Leasing Group from the Rail Products Group based on manufacturing cost. See Note 4 and Note 7 for a further discussion regarding our investment in our partially-owned leasing subsidiaries and the related indebtedness. Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 Percent 2021 2020 Percent ($ in millions) Change ($ in millions) Change Revenues: Leasing and management $ 185.5 $ 183.9 0.9 % $ 554.1 $ 558.6 (0.8) % Sales of railcars owned one year or less at the time of sale (1) — — * — 54.4 (100.0) % Total revenues $ 185.5 $ 183.9 0.9 % $ 554.1 $ 613.0 (9.6) % Operating profit (2) : Leasing and management $ 76.4 $ 86.8 (12.0) % $ 223.0 $ 247.8 (10.0) % Lease portfolio sales (1) $ 32.9 $ 2.9 * 45.7 17.7 158.2 % Total operating profit $ 109.3 $ 89.7 21.9 % $ 268.7 $ 265.5 1.2 % Total operating profit margin 58.9 % 48.8 % 48.5 % 43.3 % Leasing and management operating profit margin 41.2 % 47.2 % 40.2 % 44.4 % Selected expense information: Depreciation (3) $ 58.7 $ 51.5 14.0 % $ 170.5 $ 159.1 7.2 % Maintenance and compliance $ 22.8 $ 18.5 23.2 % $ 73.7 $ 67.4 9.3 % Rent $ 1.9 $ 2.1 (9.5) % $ 5.3 $ 8.1 (34.6) % Selling, engineering, and administrative expenses $ 11.6 $ 11.7 (0.9) % $ 36.1 $ 39.0 (7.4) % Interest (4) $ 39.9 $ 47.0 (15.1) % $ 142.6 $ 149.2 (4.4) % * Not meaningful (1) Beginning in the fourth quarter of 2020, we made a prospective change in the presentation of sales of railcars from the lease fleet. Therefore, all railcar sales for the three and nine months ended September 30, 2021 are presented as a net gain or loss from the disposal of a long-term asset regardless of the age of railcar that is sold. See Note 1 for more information. (2) Operating profit includes: depreciation; maintenance and compliance; rent; and selling, engineering, and administrative expenses. Amortization of deferred profit on railcars sold from the Rail Products Group to the Leasing Group is included in the operating profit of the Leasing Group, resulting in the recognition of depreciation expense based on our original manufacturing cost of the railcars. Interest expense is not a component of operating profit and includes the effect of hedges. (3) Depreciation expense increased $4.7 million and $7.3 million for the three and nine months ended September 30, 2021, respectively, as a result of the disposal of certain railcar components associated with our sustainable railcar conversion program. Additionally, depreciation expense related to our small cube covered hopper railcars decreased by approximately $7.0 million for the nine months ended September 30, 2021 relative to the nine months ended September 30, 2020 as a result of the impairment charge recorded in the second quarter of 2020 related to these railcars. (4) Interest expense for the nine months ended September 30, 2021 includes $11.7 million of loss on extinguishment of debt associated with the refinancing of our partially-owned subsidiaries' debt. See Note 7 for more information. Interest expense for the nine months ended September 30, 2020 includes $5.0 million of loss on extinguishment of debt associated with the early redemption of debt. Information related to lease portfolio sales is as follows: Three Months Ended Nine Months Ended 2021 2020 2021 2020 (in millions) Lease portfolio sales $ 322.1 $ 6.5 $ 410.9 $ 193.1 Operating profit on lease portfolio sales $ 32.9 $ 2.9 $ 45.7 $ 17.7 Operating profit margin on lease portfolio sales 10.2 % 44.6 % 11.1 % 9.2 % Railcar Leasing Equipment Portfolio. The Leasing Group's equipment consists primarily of railcars leased by third parties. The Leasing Group purchases equipment manufactured predominantly by the Rail Products Group and enters into lease contracts with third parties with terms generally ranging between one year and ten years. The Leasing Group primarily enters into operating leases. Future contractual minimum rental revenues on operating leases related to our wholly-owned and partially-owned subsidiaries are as follows: Remaining three months of 2021 2022 2023 2024 2025 Thereafter Total (in millions) Future contractual minimum rental revenues $ 145.1 $ 492.6 $ 371.8 $ 278.1 $ 196.8 $ 343.7 $ 1,828.1 Debt. Wholly-owned subsidiaries. The Leasing Group’s debt at September 30, 2021 consisted primarily of non-recourse debt. As of September 30, 2021, Trinity’s wholly-owned subsidiaries included in the Leasing Group held equipment with a net book value of $4,761.9 million, which is pledged solely as collateral for Leasing Group debt held by those subsidiaries. The net book value of unpledged equipment at September 30, 2021 was $825.8 million. See Note 7 for more information regarding the Leasing Group debt. Partially-owned subsidiaries. Debt owed by TRIP Holdings and RIV 2013 and their respective subsidiaries is nonrecourse to Trinity and TILC. Creditors of each of TRIP Holdings and RIV 2013 and their respective subsidiaries have recourse only to the particular subsidiary's assets. TRIP Holdings held equipment with a net book value of $1,130.2 million, which is pledged solely as collateral for the TRIP Holdings' debt held by its subsidiaries. TRP-2021 equipment with a net book value of $464.5 million is pledged solely as collateral for the TRP-2021 debt. See Note 4 for a description of TRIP Holdings and RIV 2013 and their respective subsidiaries. Operating Lease Obligations. Future amounts due as well as future contractual minimum rental revenues related to the Leasing Group's railcar operating lease obligations are as follows: Remaining three months of 2021 2022 2023 2024 2025 Thereafter Total (in millions) Future operating lease obligations $ 2.8 $ 10.8 $ 9.0 $ 5.5 $ 3.7 $ 7.8 $ 39.6 Future contractual minimum rental revenues $ 1.6 $ 5.0 $ 3.0 $ 2.1 $ 1.2 $ 0.7 $ 13.6

Property, Plant, and Equipment

Property, Plant, and Equipment	9 Months Ended
	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Property, Plant, and Equipment	Property, Plant, and Equipment The following table summarizes the components of property, plant, and equipment: September 30, 2021 December 31, 2020 (in millions) Manufacturing/Corporate: Land $ 22.0 $ 23.2 Buildings and improvements 423.8 428.6 Machinery and other 481.6 485.1 Construction in progress 18.7 42.5 946.1 979.4 Less: accumulated depreciation (561.5) (577.9) 384.6 401.5 Leasing: Wholly-owned subsidiaries: Machinery and other 20.1 19.5 Equipment on lease 6,917.3 7,010.6 6,937.4 7,030.1 Less: accumulated depreciation (1,334.0) (1,234.2) 5,603.4 5,795.9 Partially-owned subsidiaries: Equipment on lease 2,258.9 2,248.2 Less: accumulated depreciation (664.2) (621.9) 1,594.7 1,626.3 Deferred profit on railcars sold to the Leasing Group (1,044.7) (1,064.7) Less: accumulated amortization 262.1 244.4 (782.6) (820.3) $ 6,800.1 $ 7,003.4

Debt

Debt	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Debt	Debt The carrying amounts of our long-term debt are as follows: September 30, 2021 December 31, 2020 (in millions) Corporate – Recourse: Revolving credit facility $ — $ 50.0 Senior notes, net of unamortized discount of $0.2 and $0.2 399.8 399.8 399.8 449.8 Less: unamortized debt issuance costs (1.3) (1.6) Total recourse debt 398.5 448.2 Leasing – Non-recourse: Wholly-owned subsidiaries: Secured railcar equipment notes, net of unamortized discount of $0.5 and $0.6 2,293.3 2,042.4 2017 promissory notes, net of unamortized discount of $8.4 and $10.1 770.8 802.7 TILC warehouse facility 514.4 519.4 3,578.5 3,364.5 Less: unamortized debt issuance costs (25.0) (24.0) 3,553.5 3,340.5 Partially-owned subsidiaries: Secured railcar equipment notes, net of unamortized discount of $0.3 and $— 909.2 1,237.5 TRIP Railcar Co. term loan 327.0 — Less: unamortized debt issuance costs (11.7) (9.2) 1,224.5 1,228.3 Total non–recourse debt 4,778.0 4,568.8 Total debt $ 5,176.5 $ 5,017.0 Estimated Fair Value of Debt – The estimated fair value of our 4.55% senior notes due 2024 ("Senior Notes") is based on a quoted market price in a market with little activity (Level 2 input). The estimated fair values of our secured railcar equipment notes are based on our estimate of their fair value using unobservable input values provided by a third party (Level 3 inputs). The respective carrying values of our revolving credit facility, 2017 promissory notes, TILC warehouse facility, and TRIP Railcar Co. term loan approximate fair value because the interest rate adjusts to the market interest rate. The estimated fair values of our long-term debt are as follows: September 30, 2021 December 31, 2020 (in millions) Level 1 $ 1,612.2 $ 1,372.1 Level 2 425.3 420.3 Level 3 3,295.6 3,462.4 $ 5,333.1 $ 5,254.8 Revolving Credit Facility – We have a $450.0 million unsecured corporate revolving credit facility. During the nine months ended September 30, 2021, we had total borrowings of $470.0 million and total repayments of $520.0 million under the revolving credit facility. Additionally, we had outstanding letters of credit issued in an aggregate amount of $28.3 million, leaving $421.7 million available for borrowing as of September 30, 2021. The outstanding letters of credit as of September 30, 2021 are scheduled to expire in July 2022. The revolving credit facility bears interest at a variable rate which resulted in an interest rate of LIBOR plus 1.75%, with a LIBOR floor of 0.30%, as of September 30, 2021. A commitment fee accrues on the average daily unused portion of the revolving facility at the rate of 0.175% to 0.40% (0.25% as of September 30, 2021). The revolving credit facility requires the maintenance of ratios related to minimum interest coverage for the leasing and manufacturing operations and maximum leverage. In March 2021, we amended our revolving credit facility to increase the maximum leverage ratio through March 31, 2022 and to decrease the minimum interest coverage ratio through December 31, 2021 to provide additional near-term flexibility. As of September 30, 2021, we were in compliance with all such financial covenants. TILC Warehouse Loan Facility – TILC has a $1.0 billion warehouse loan facility, which was established to finance railcars owned by TILC. In March 2021, the facility was extended through March 15, 2024, the total commitment was increased from $750 million to $1.0 billion, with a potential increase of up to an additional $250 million, subject to certain conditions, and provided for a facility margin of 185 basis points. During the nine months ended September 30, 2021, we had total borrowings of $374.7 million and total repayments of $379.7 million under the TILC warehouse loan facility. Under the renewed facility, the entire unused facility amount of $485.6 million was available as of September 30, 2021 based on the amount of warehouse-eligible, unpledged equipment. Advances under the facility bear interest at a defined index rate plus a margin, for an all-in interest rate of 1.94% at September 30, 2021. TRL-2021 – In June 2021, Trinity Rail Leasing 2021 LLC, a Delaware limited liability company ("TRL-2021") and a limited purpose, indirect wholly-owned subsidiary of the Company owned through TILC, issued an aggregate principal amount of (i) $305.2 million of its Series 2021-1 Class A Green Secured Railcar Equipment Notes (the "TRL-2021 Class A Notes") and (ii) $19.8 million of its Series 2021-1 Class B Green Secured Railcar Equipment Notes (the "TRL-2021 Class B Notes") (the TRL-2021 Class A Notes and the TRL-2021 Class B Notes are, collectively, the “TRL-2021 Notes”). The TRL-2021 Class A Notes bear interest at a fixed rate of 2.26%, and the TRL-2021 Class B Notes bear interest at a fixed rate of 3.08%. The TRL-2021 Notes are payable monthly, and have a stated final maturity date of July 19, 2051. We incurred $3.3 million in debt issuance costs, which will be amortized to interest expense through the anticipated repayment date of the TRL-2021 Notes. The TRL-2021 Notes are obligations of TRL-2021 and are non-recourse to Trinity. The obligations are secured by a portfolio of railcars and operating leases thereon, certain cash reserves, and other assets acquired and owned by TRL-2021. Net proceeds received from the railcars acquired in connection with the issuance of the TRL-2021 Notes were used to repay approximately $214.4 million of borrowings under TILC's warehouse loan facility and for general corporate purposes. June 2021 Refinancing of Partially-Owned Leasing Subsidiaries Triumph Rail – In June 2021, Triumph Rail, formerly known as TRIP Master Funding, issued an aggregate principal amount of (i) $535.0 million of its Series 2021-2 Class A Green Secured Railcar Equipment Notes (the “Triumph Class A Notes”) and (ii) $25.4 million of its Series 2021-2 Class B Green Secured Railcar Equipment Notes (the “Triumph Class B Notes”) (the Triumph Class A Notes and the Triumph Class B Notes are, collectively, the “Triumph Notes”). The Triumph Class A Notes bear interest at a fixed rate of 2.15%, and the Triumph Class B Notes bear interest at a fixed rate of 3.08%. The Triumph Notes are payable monthly, and have a stated final maturity date of June 15, 2051. We incurred $5.6 million in debt issuance costs, which will be amortized to interest expense through the anticipated repayment date of the Triumph Notes. The Triumph Notes are non-recourse to Trinity, TILC, TRIP Holdings, and the other equity investors in TRIP Holdings, and are secured by Triumph Rail's portfolio of railcars and operating leases thereon, its cash reserves, and all other assets owned by Triumph Rail. Triumph Rail used the net proceeds received from the issuance of the Triumph Notes, as well as proceeds from the sale of railcars and related operating leases to TRIP Railcar Co. described below, to redeem its outstanding debt, consisting of (i) the Series 2011 Class A-2 TRIP Master Funding Secured Railcar Equipment Notes due July 2041, (ii) the Series 2014-1 Class A-2 Secured Railcar Equipment Notes due April 2044, and (iii) the Series 2017-1 Secured Railcar Equipment Notes due August 2047, of which $869.1 million was outstanding at the redemption date. The all-in rate for these notes was 5.16% per annum at the time of redemption. In connection with the redemption, we recognized a loss on extinguishment of debt of $8.7 million, which included a $3.3 million early redemption premium and a write-off of $5.4 million in unamortized debt issuance costs. These charges are reflected in the loss on extinguishment of debt line of our Consolidated Statements of Operations for the nine months ended September 30, 2021. TRIP Railcar Co. Term Loan – In June 2021, TRIP Railcar Co. drew down $329.6 million under a term loan agreement ("TRIP Railcar Co. term loan"). The TRIP Railcar Co. term loan was established to finance railcars and operating leases thereon purchased by TRIP Railcar Co. from Triumph Rail. The principal and interest of this indebtedness are paid from the cash flows of the underlying leases. The TRIP Railcar Co. term loan bears interest at LIBOR plus 1.85%, for an all-in interest rate of 1.94% at September 30, 2021, and has a stated maturity date of June 2025. We incurred $2.9 million in debt issuance costs, which will be amortized to interest expense over the anticipated repayment term of the TRIP Railcar Co. term loan. The TRIP Railcar Co. term loan is non-recourse to Trinity, TILC, TRIP Holdings, and the other equity investors in TRIP Holdings; and are secured by TRIP Railcar Co.'s portfolio of railcars, operating leases thereon, and all other assets owned by TRIP Railcar Co. Net proceeds received from the transaction were used to purchase railcars and related operating leases from Triumph Rail. TRP-2021 – In June 2021, TRP-2021, formerly known as TRL-2012, issued an aggregate principal amount of (i) $334.0 million of its Series 2021-1 Class A Green Secured Railcar Equipment Notes (the “TRP-2021 Class A Notes”) and (ii) $21.0 million of its Series 2021-1 Class B Green Secured Railcar Equipment Notes (the “TRP-2021 Class B Notes”) (the TRP-2021 Class A Notes and the TRP-2021 Class B Notes are, collectively, the “TRP-2021 Notes”). The TRP-2021 Class A Notes bear interest at a fixed rate of 2.07%, and the TRP-2021 Class B Notes bear interest at a fixed rate of 3.06%. The TRP-2021 Notes are payable monthly, and have a stated final maturity date of June 15, 2051. We incurred $3.7 million in debt issuance costs, which will be amortized to interest expense through the anticipated repayment date of the TRP-2021 Notes. The TRP-2021 Notes are non-recourse to Trinity, TILC, RIV 2013, and the other equity investors in RIV 2013, and are secured by TRP-2021's portfolio of railcars and operating leases thereon, its cash reserves, and all other assets owned by TRP-2021. TRP-2021 used the net proceeds from the issuance of the TRP-2021 Notes to redeem its outstanding debt, consisting of (i) the Series 2012-1 Secured Railcar Equipment Notes due January 2043 and (ii) the Series 2013-1 Class A-1 Secured Railcar Equipment Notes due July 2043, of which $348.0 million was outstanding at the redemption date. The all-in rate for these notes was 3.59% per annum at the time of redemption. In connection with the redemption, we recognized a loss on extinguishment of debt of $3.0 million, which related to the write-off of unamortized debt issuance costs. This write-off is reflected in the loss on extinguishment of debt line of our Consolidated Statements of Operations for the nine months ended September 30, 2021. Each of our secured railcar equipment notes, including the TRL-2021 Notes, the Triumph Rail Notes, and the TRP-2021 Notes, generally has an anticipated repayment date and a stated final maturity date. While the stated final maturity date of these notes is in 2051, the cash flows from the assets of each of TRL-2021, Triumph Rail, and TRP-2021 will be applied, pursuant to the payment priorities of their respective indentures, so as to amortize their respective notes to achieve monthly targeted principal balances. If the cash flow assumptions used in determining the targeted balances are met, it is anticipated that the Notes will be repaid well in advance of their stated final maturity date. There can be no assurance, however, that such cash flow assumptions will be realized. If these notes are not repaid by the anticipated repayment date, the respective interest rates on these notes would increase from the fixed rates stated above.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate from continuing operations for the three months ended September 30, 2021 was an expense of 23.9%, which differs from the U.S. statutory rate of 21.0% primarily due to state income taxes, foreign taxes, non-deductible executive compensation, and other permanent differences. The effective tax rate from continuing operations for the nine months ended September 30, 2021 was an expense of 27.8%, which differs from the U.S. statutory rate primarily due to an adjustment to the Coronavirus Aid, Relief, and Economic Security Act (the "CARES Act") carryback benefit previously recognized and foreign taxes, partially offset by excess tax benefits associated with equity based compensation. Our effective tax rates from continuing operations for the three and nine months ended September 30, 2020 were a benefit of 34.9% and a benefit of 69.5%, respectively, primarily due to carryback claims as permitted under the CARES Act, partially offset by the portion of the non-cash impairment charge that is not tax-effected because it is related to the noncontrolling interest. Our effective tax rates, without the impact of the CARES Act, were an expense of 10.2% and a benefit of 15.8% for the three and nine months ended September 30, 2020, respectively, which differs from the U.S. statutory rate primarily due to the impacts of state income taxes, foreign taxes, tax return true-ups, and non-deductible executive compensation. Income tax refunds received, net of payments, during the nine months ended September 30, 2021 totaled $246.9 million. The total income tax receivable position as of September 30, 2021 was $191.9 million, primarily related to carryback claims that have been filed. Our 2016 and 2017 tax years are effectively settled. The statutes of limitations for auditing the 2013-2015 and 2018-2020 tax years will remain open due to tax loss carryback claims that have been filed. We have state tax returns that are under audit in the normal course of business, and our Mexican subsidiaries' tax return statutes of limitations remain open for auditing 2014 forward. We believe we are appropriately reserved for any potential matters.

Employee Retirement Plans

Employee Retirement Plans	9 Months Ended
	Sep. 30, 2021
Retirement Benefits [Abstract]
Employee Retirement Plans	Employee Retirement Plans The following table summarizes the components of our net retirement cost: Three Months Ended Nine Months Ended 2021 2020 2021 2020 (in millions) Expense Components Service cost $ — $ — $ — $ — Interest 0.1 3.8 0.3 11.2 Expected return on plan assets — (5.3) — (15.7) Amortization of actuarial loss — 1.5 0.2 4.5 Amortization of prior service cost — 0.3 — 0.9 Net periodic benefit cost 0.1 0.3 0.5 0.9 Profit sharing 3.1 1.9 8.3 6.5 Net expense $ 3.2 $ 2.2 $ 8.8 $ 7.4 The non-service cost components of net periodic benefit cost in the table above are included in other, net (income) expense in our Consolidated Statements of Operations. For the three and nine months ended September 30, 2021, net periodic benefit cost relates to the Supplemental Executive Retirement Plan. Pension Plan Termination In September 2019, our Board of Directors approved the termination of the Trinity Industries, Inc. Consolidated Pension Plan (the "Pension Plan"), effective December 31, 2019. The Pension Plan was settled in the fourth quarter of 2020, which resulted in the Company no longer having any remaining funded pension plan obligations. Upon settlement, we recognized a pre-tax non-cash pension settlement charge in the fourth quarter of 2020 of $151.5 million, which was inclusive of all unamortized losses previously recorded in AOCL.

Restructuring Activities (Notes

Restructuring Activities (Notes)	9 Months Ended
	Sep. 30, 2021
Restructuring and Related Activities [Abstract]
Restructuring and Related Activities Disclosure [Text Block]	Asset Impairments and Restructuring Activities Second quarter of 2020 impairment of small cube covered hopper railcars During the second quarter of 2020, the oil and gas proppants (or “frac sand”) industry continued to experience economic pressure created by low oil prices, reduced fracking activity, and the ongoing economic impact of COVID-19. Significant price declines in the crude oil market, as well as lower demand for certain commodities, resulted in a decline in customer demand for certain types of railcars. As a result, certain of the Leasing Group's small cube covered hopper customers requested rent relief and, in a number of cases, filed for bankruptcy in the second quarter of 2020. Therefore, we determined that the events and circumstances that arose during the second quarter of 2020 constituted an impairment triggering event related to the small cube covered hopper car type in our lease fleet portfolio. We performed a cash flow recoverability test of our small cube covered hopper railcars and compared the undiscounted cash flows to the carrying value of the assets. Significant management judgment was used to determine the key assumptions utilized in our impairment analysis, the substantial majority of which represent unobservable (Level 3) inputs. The aggregate impairment charge of $369.4 million is reflected in the impairment of long-lived assets line of our Consolidated Statements of Operations for the nine months ended September 30, 2020. See Note 11 of our 2020 Annual Report on Form 10-K for further information regarding impairment of long-lived assets related to our small cube covered hopper railcars. Restructuring activities During the three months ended September 30, 2021, restructuring activities resulted in a net gain of $0.1 million. During the nine months ended September 30, 2021, restructuring activities resulted in a net gain of $1.1 million, primarily as a result of a $1.6 million gain on the disposition of certain non-operating facilities included in previous restructuring plans, partially offset by $0.5 million in employee severance costs. During the three months ended September 30, 2020, we recorded total restructuring charges of $4.7 million, consisting of $3.4 million for severance costs, $0.7 million in asset write-downs associated with transportation equipment in our logistics operations, and $0.6 million of contract termination costs. During the nine months ended September 30, 2020, we recorded total restructuring charges of $10.5 million, consisting of $7.5 million for severance costs, $5.9 million of non-cash charges primarily from the write-down of our corporate headquarters campus and certain other assets, and $0.6 million in contract termination costs, partially offset by a $3.5 million net gain on the disposition of a non-operating facility and certain related assets. The following table sets forth the restructuring activity and balance of the restructuring liability, which is included in other liabilities in our Consolidated Balance Sheets: Accrued charges as of December 31, 2020 Charges and adjustments Payments Accrued charges as of September 30, 2021 (in millions) Cash charges: Employee severance costs $ 1.4 $ 0.5 $ (1.6) $ 0.3 $ 1.4 $ 0.5 $ (1.6) $ 0.3 Non-cash charges: Gain on disposition of assets $ (1.6) Total restructuring activities $ (1.1) Although restructuring activities are not allocated to our reportable segments, the following tables summarize the restructuring activities by reportable segment: Three Months Ended September 30, 2021 Employee Severance Costs Gain on Disposition on Assets Total Railcar Leasing and Management Services Group $ — $ — $ — Rail Products Group 0.1 — $ 0.1 All Other — (0.2) $ (0.2) Corporate — — $ — Total restructuring activities $ 0.1 $ (0.2) $ (0.1) Three Months Ended September 30, 2020 Employee Severance Costs Contract Termination Costs Write-down of Assets Total (in millions) Railcar Leasing and Management Services Group $ 1.4 $ — $ — $ 1.4 Rail Products Group 1.3 0.2 0.7 2.2 All Other 0.1 — — 0.1 Corporate 0.6 0.4 — 1.0 Total restructuring activities $ 3.4 $ 0.6 $ 0.7 $ 4.7 Nine Months Ended September 30, 2021 Employee Severance Costs Gain on Disposition of Assets Total (in millions) Railcar Leasing and Management Services Group $ — $ — $ — Rail Products Group 0.4 — 0.4 All Other — (1.6) (1.6) Corporate 0.1 — 0.1 Total restructuring activities $ 0.5 $ (1.6) $ (1.1) Nine Months Ended September 30, 2020 Employee Severance Costs Contract Termination Costs Gain on Disposition of Assets Write-down of Assets Total (in millions) Railcar Leasing and Management Services Group $ 1.4 $ — $ — $ — $ 1.4 Rail Products Group 3.9 0.2 — 0.7 4.8 All Other 0.2 — (3.5) — (3.3) Corporate 2.0 0.4 — 5.2 7.6 Total restructuring activities $ 7.5 $ 0.6 $ (3.5) $ 5.9 $ 10.5

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Changes in AOCL for the nine months ended September 30, 2021 are as follows: Currency translation adjustments Unrealized gains/(losses) on derivative financial instruments Net actuarial gains/(losses) and prior service costs of defined benefit plans Accumulated Other Comprehensive Loss (in millions) Balances at December 31, 2020 $ (1.3) $ (25.6) $ (4.0) $ (30.9) Other comprehensive income, net of tax, before reclassifications — 5.0 — 5.0 Amounts reclassified from AOCL, net of tax benefit of $—, $0.6, $0.1, and $0.7 — 2.9 0.1 3.0 Less: noncontrolling interest — (1.0) — (1.0) Other comprehensive income — 6.9 0.1 7.0 Balances at September 30, 2021 $ (1.3) $ (18.7) $ (3.9) $ (23.9) See Note 2 for information on the reclassification of amounts in AOCL into earnings. Reclassifications of unrealized before-tax gains and losses on derivative financial instruments are included in interest expense for our interest rate hedges and in cost of revenues for our foreign currency hedges in our Consolidated Statements of Operations. Reclassifications of before-tax net actuarial gains/(losses) and prior service costs of defined benefit plans are included in other, net (income) expense in our Consolidated Statements of Operations.

Common Stock and Stock-Based Co

Common Stock and Stock-Based Compensation	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	Common Stock and Stock-Based Compensation Stockholders' Equity Repurchase Agreement with ValueAct On April 29, 2021, we entered into a stock repurchase agreement with ValueAct Capital Master Fund, L.P. (“ValueAct”), the Company's largest shareholder and a related party, to repurchase 8.1 million shares of our common stock for $27.47 per share, for an aggregate purchase price of $222.5 million, in a privately negotiated transaction. The price per share represents a discount of 3.5% from the closing price for a share of common stock on the New York Stock Exchange on April 29, 2021. The repurchase from ValueAct was approved by our Board of Directors separately from, and did not reduce the authorized amount remaining under, the previous share repurchase program described below. New Share Repurchase Authorization In September 2021, our Board of Directors authorized a new share repurchase program effective September 9, 2021 through December 31, 2022. The new share repurchase program authorizes the Company to repurchase up to $250.0 million of its common stock. There were no shares repurchased under this program during the three months ended September 30, 2021. Previous Share Repurchase Authorization In October 2020, our Board of Directors authorized a share repurchase program effective October 23, 2020 through December 31, 2021. The share repurchase program authorized the Company to repurchase up to $250.0 million of its common stock and was completed in the third quarter of 2021. Share repurchase activity under this program is as follows: Shares Repurchased Remaining Authorization to Repurchase Period Number of shares Cost Cost October 23, 2020 Authorization $ 250.0 October 23, 2020 through December 31, 2020 2,974,922 $ 67.8 $ 182.2 January 1, 2021 through March 31, 2021 1,291,860 36.8 $ 145.4 April 1, 2021 through June 30, 2021 2,440,793 68.3 $ 77.1 July 1, 2021 through September 30, 2021 2,815,307 77.1 $ — Total 9,522,882 $ 250.0 During the three and nine months ended September 30, 2021, total share repurchases were 2.8 million and 14.6 million, respectively, at a cost of approximately $77.1 million and $404.7 million, respectively. During the three and nine months ended September 30, 2020, share repurchases totaled 4.5 million and 6.3 million, respectively, at a cost of approximately $89.9 million and $125.3 million, respectively, under a previous share repurchase program, which was completed in the third quarter of 2020. Certain shares of stock repurchased during September 2020, totaling $4.9 million, were cash settled in October 2020 in accordance with normal settlement practices. Stock-Based Compensation Stock-based compensation totaled approximately $6.5 million and $16.3 million for the three and nine months ended September 30, 2021, respectively. Stock-based compensation totaled approximately $4.8 million and $19.7 million for the three and nine months ended September 30, 2020, respectively. The Company's annual grant of share-based awards generally occurs in the second quarter under our 2004 Fourth Amended and Restated Stock Option and Incentive Plan (the "Plan”). Our stock options have contractual terms of ten years. Expense related to stock options issued to eligible employees under the Plan is recognized on a straight-line basis over their vesting period. Expense related to restricted stock units ("RSUs") issued to eligible employees under the Plan is recognized ratably over the vesting period, generally between three years and four years. Beginning in 2020, certain RSU grants provide for full vesting when the award recipients reach 60 years of age and have provided at least 10 years of service to the Company, provided that the awards remain outstanding for a period of six months from the date of grant. The expense for these awards is recognized over the applicable service period for each of the eligible award recipients. Expense related to RSUs and restricted stock awards ("RSAs") granted to non-employee directors under the Plan is recognized ratably over the vesting period, generally one year. Expense related to performance units is recognized ratably from their award date to the end of the performance period, generally three years. The following table summarizes stock-based compensation awards granted during the nine months ended September 30, 2021: Number of Shares Granted Weighted Average Grant-Date Fair Value per Award Restricted stock units 617,165 $ 28.40 Restricted stock awards 22,734 $ 28.48 Performance units 240,931 $ 30.85

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share Basic net income (loss) attributable to Trinity Industries, Inc. per common share ("EPS") is computed by dividing net income (loss) attributable to Trinity remaining after allocation to unvested restricted shares by the weighted average number of basic common shares outstanding for the period. Except when the effect would be antidilutive, the calculation of diluted EPS includes the net impact of potentially dilutive common shares. The Company has certain unvested RSAs that participate in dividends on a nonforfeitable basis and are therefore considered to be participating securities. Consequently, diluted net income (loss) attributable to Trinity Industries, Inc. per common share is calculated under both the two-class method and the treasury stock method, and the more dilutive of the two calculations is presented. There were no restricted shares and stock options included in the computation of diluted earnings per common share for the nine months ended September 30, 2020 as we incurred a loss for the period, and any effect on loss per common share would have been antidilutive. The following table sets forth the computation of basic and diluted net income (loss) attributable to Trinity Industries, Inc. for the three and nine months ended September 30, 2021 and 2020. Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (in millions, except per share amounts) Income (loss) from continuing operations $ 36.3 $ 25.9 $ 42.8 $ (99.4) Less: Net (income) loss attributable to noncontrolling interest (3.9) (0.8) 6.0 79.5 Unvested restricted share participation – continuing operations — (0.2) — — Net income (loss) from continuing operations attributable to Trinity Industries, Inc. 32.4 24.9 48.8 (19.9) Net loss from discontinued operations, net of income taxes (0.4) — (0.8) (0.2) Unvested restricted share participation – discontinued operations — — — — Net loss from discontinued operations attributable to Trinity Industries, Inc. (0.4) — (0.8) (0.2) Net income (loss) attributable to Trinity Industries, Inc., including the effect of unvested restricted share participation $ 32.0 $ 24.9 $ 48.0 $ (20.1) Basic weighted average shares outstanding 97.7 116.4 103.4 117.2 Effect of dilutive securities 1.8 0.6 2.3 — Diluted weighted average shares outstanding 99.5 117.0 105.7 117.2 Basic earnings per common share: Income (loss) from continuing operations $ 0.33 $ 0.21 $ 0.47 $ (0.17) Income (loss) from discontinued operations — — (0.01) — Basic net income (loss) attributable to Trinity Industries, Inc. $ 0.33 $ 0.21 $ 0.46 $ (0.17) Diluted earnings per common share: Income (loss) from continuing operations $ 0.33 $ 0.21 $ 0.46 $ (0.17) Income (loss) from discontinued operations — — (0.01) — Diluted net income (loss) attributable to Trinity Industries, Inc. $ 0.33 $ 0.21 $ 0.45 $ (0.17) Potentially dilutive securities excluded from EPS calculation: Antidilutive restricted shares 0.1 0.3 0.1 — Antidilutive stock options — 0.3 — —

Contingencies

Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Highway products litigation We previously reported the filing of a False Claims Act (“FCA”) complaint in the United States District Court for the Eastern District of Texas, Marshall Division (“District Court”) styled Joshua Harman, on behalf of the United States of America, Plaintiff/Relator v. Trinity Industries, Inc., Defendant , Case No. 2:12-cv-00089-JRG (E.D. Tex.). In this case, in which the U.S. Government declined to intervene, the relator, Mr. Joshua Harman, alleged the Company violated the FCA pertaining to sales of the Company's ET-Plus® System, a highway guardrail end-terminal system (“ET Plus”). On October 20, 2014, a trial in this case concluded with a jury verdict stating that the Company and its subsidiary, Trinity Highway Products, LLC (“Trinity Highway Products”), “knowingly made, used or caused to be made or used, a false record or statement material to a false or fraudulent claim," and the District Court entered judgment on the verdict in the total amount of $682.4 million. On September 29, 2017, the United States Court of Appeals for the Fifth Circuit ("Fifth Circuit") reversed the District Court’s $682.4 million judgment and rendered judgment as a matter of law in favor of the Company and Trinity Highway Products. On January 7, 2019, the United States Supreme Court denied Mr. Harman's petition for certiorari seeking review of the Fifth Circuit's decision. The denial of Mr. Harman's petition ended this action. State, county, and municipal actions Mr. Harman also has separate state qui tam actions currently pending pursuant to: the Virginia Fraud Against Taxpayers Act ( Commonwealth of Virginia ex rel. Joshua M. Harman v. Trinity Industries, Inc. and Trinity Highway Products, LLC , Case No. CL13-698, in the Circuit Court, Richmond, Virginia) and the Massachusetts False Claims Act ( Commonwealth of Massachusetts ex rel. Joshua M. Harman Qui Tam v. Trinity Industries, Inc. and Trinity Highway Products, LLC , Case No. 1484-CV-02364, in the Superior Court Department of the Trial Court). In addition to these two currently pending state qui tam actions, Mr. Harman has also filed a second amended complaint in a previously dismissed action pursuant to the Tennessee False Claims Act ( State of Tennessee ex rel. Joshua M. Harman v. Trinity Industries, Inc., and Trinity Highway Products, LLC , Case No. 14C2652, in the Circuit Court for Davidson County, Tennessee) and sought leave to file an amended complaint in a previously dismissed action pursuant to the New Jersey False Claims Act ( State of New Jersey ex rel. Joshua M. Harman v. Trinity Industries, Inc. and Trinity Highway Products, LLC , Case No.L-1344-14, in the Superior Court of New Jersey Law Division: Mercer County). In each of these cases, Mr. Harman alleged the Company violated the respective states' false claims act pertaining to sales of the ET Plus, and he is seeking damages, civil penalties, attorneys’ fees, costs and interest. Also, the respective states’ Attorneys General filed Notices of Election to Decline Intervention in all of these matters, with the exception of the Commonwealth of Virginia Attorney General, who intervened in the Virginia matter. No trial date has been scheduled in these cases other than in the Massachusetts action, which has been scheduled for trial on June 7, 2022, and the Virginia action, which has been scheduled for trial on April 17, 2023. The Company believes these state qui tam lawsuits are without merit and intends to vigorously defend all allegations. Other states could take similar or different actions, and could be considering similar state false claims or other litigation against the Company. As previously reported, state qui tam actions filed by Mr. Harman in the states of Delaware, Florida, Georgia, Illinois, Indiana, Iowa, Minnesota, Montana, Nevada, Rhode Island, Tennessee, New Jersey, and California were dismissed. The Company has been served in a lawsuit filed November 5, 2015, titled Jackson County, Missouri, individually and on behalf of a class of others similarly situated vs. Trinity Industries, Inc. and Trinity Highway Products, LLC , Case No. 1516-CV23684 (Circuit Court of Jackson County, Missouri). The case is being brought by plaintiff for and on behalf of itself and all Missouri counties with a population of 10,000 or more persons, including the City of St. Louis, and the State of Missouri’s transportation authority. The plaintiff alleges that the Company and Trinity Highway Products did not disclose design changes to the ET Plus and these allegedly undisclosed design changes made the ET Plus allegedly defective, unsafe, and unreasonably dangerous. The plaintiff alleges product liability negligence, product liability strict liability, and negligently supplying dangerous instrumentality for supplier’s business purposes. The plaintiff seeks compensatory damages, interest, attorneys' fees and costs, and in the alternative plaintiff seeks a declaratory judgment that the ET Plus is defective, the Company’s conduct was unlawful, and class-wide costs and expenses associated with removing and replacing the ET Plus throughout Missouri. On December 6, 2017, the Court granted plaintiff's Motion for Class Certification, certifying a class of Missouri counties with populations of 10,000 or more persons, including the City of St. Louis and the State of Missouri's transportation authority that have or had ET Plus guardrail end terminals with 4-inch wide guide channels installed on roadways they own or maintain. A trial date has been scheduled in this case for April 4, 2022. The Company believes this lawsuit is without merit and intends to vigorously defend all allegations. While the financial impacts of these state, county, and municipal actions are currently unknown, they could be material. Based on information currently available to the Company and previously disclosed, we currently do not believe that a loss is probable in any one or more of the actions described under "State, county, and municipal actions," therefore no accrual has been included in the accompanying Consolidated Financial Statements. Because of the complexity of these actions as well as the current status of certain of these actions, we are not able to estimate a range of possible losses with respect to any one or more of these actions. Product liability cases The Company is currently defending product liability lawsuits in several different states that are alleged to involve the ET Plus as well as other products manufactured by Trinity Highway Products. These cases are diverse in light of the randomness of collisions in general and the fact that each accident involving a roadside device, such as an end terminal, or any other fixed object along the highway, has its own unique facts and circumstances. The Company carries general liability insurance to mitigate the impact of adverse judgment exposures in these product liability cases. To the extent that the Company believes that a loss is probable with respect to these product liability cases, the accrual for such losses is included in the amounts described below under "Other matters". Other matters The Company is involved in claims and lawsuits incidental to our business arising from various matters, including product warranty, personal injury, environmental issues, workplace laws, and various governmental regulations. The Company evaluates its exposure to such claims and suits periodically and establishes accruals for these contingencies when a range of loss can be reasonably estimated. The range of reasonably possible losses for such matters is $11.2 million to $18.4 million, which includes our rights in indemnity and recourse to third parties of approximately $6.4 million, which is recorded in other assets on our Consolidated Balance Sheet as of September 30, 2021. This range includes any amounts related to the Highway Products litigation matters described above in the section titled “Highway products litigation." At September 30, 2021, total accruals of $11.7 million, including environmental and workplace matters described below, are included in accrued liabilities in the accompanying Consolidated Balance Sheets. The Company believes any additional liability would not be material to its financial position or results of operations. Trinity is subject to remedial orders and federal, state, local, and foreign laws and regulations relating to the environment and the workplace. The Company has reserved $1.4 million to cover our probable and estimable liabilities with respect to the investigations, assessments, and remedial responses to such matters, taking into account currently available information and our contractual rights to indemnification and recourse to third parties. However, estimates of liability arising from future proceedings, assessments, or remediation are inherently imprecise. Accordingly, there can be no assurance that we will not become involved in future litigation or other proceedings involving the environment and the workplace or, if we are found to be responsible or liable in any such litigation or proceeding, that such costs would not be material to the Company. We believe that we are currently in substantial compliance with environmental and workplace laws and regulations. Georgia tornado On March 26, 2021, a tornado damaged the Company’s rail maintenance facility in Cartersville, Georgia. We have incurred costs related to cleanup and damage remediation activities in order for the facility to resume operations in the second quarter. We believe our insurance coverage is sufficient to cover property damage costs related to the event. Accordingly, at March 31, 2021, we recorded an insurance receivable of approximately $1.2 million for property damage recoveries, which was collected in the third quarter of 2021. As of September 30, 2021, we have received total advanced payments from insurance of approximately $14.6 million, which includes $8.1 million for reimbursement of cleanup and damage remediation expenditures and the $1.2 million insurance receivable described above. We recorded a gain of $4.7 million for insurance recoveries received in excess of the net book value of assets destroyed, net of the applicable deductible, which is included in the gains on dispositions of other property line in our Consolidated Statements of Operations. As of September 30, 2021, we have utilized $2.6 million of the advanced payments from insurance towards new capital expenditures in support of the reconstruction efforts. Any additional property damage insurance proceeds received in excess of the net book value of property lost and related cleanup costs will be accounted for as gains in future quarters. Additionally, the Company may be entitled to business interruption proceeds related to the event. We will not record these recoveries until final settlement has been reached with the insurance carriers.

Summary of Significant Accounti

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]	Basis of Presentation The foregoing Consolidated Financial Statements are unaudited and have been prepared from the books and records of Trinity Industries, Inc. and its consolidated subsidiaries (“Trinity,” “Company,” “we,” “our,” or "us") including the accounts of our wholly-owned subsidiaries and partially-owned subsidiaries, TRIP Rail Holdings LLC (“TRIP Holdings”) and RIV 2013 Rail Holdings LLC ("RIV 2013"), in which we have a controlling interest. In our opinion, all normal and recurring adjustments necessary for a fair presentation of our financial position as of September 30, 2021, and the results of operations for the three and nine months ended September 30, 2021 and 2020, and cash flows for the nine months ended September 30, 2021 and 2020, have been made in conformity with generally accepted accounting principles. All significant intercompany accounts and transactions have been eliminated. Certain prior year balances have been reclassified to conform to the 2021 presentation. Due to seasonal and other factors, including the impacts of the coronavirus pandemic (“COVID-19”) and the related governmental response, the results of operations for the nine months ended September 30, 2021 may not be indicative of expected results of operations for the year ending December 31, 2021. These interim financial statements and notes are condensed as permitted by the instructions to Form 10-Q and should be read in conjunction with our audited Consolidated Financial Statements included in our Form 10-K for the year ended December 31, 2020.
Revenue [Policy Text Block]	Revenue Recognition Revenue is measured based on the allocation of the transaction price in a contract to satisfied performance obligations. The transaction price does not include any amounts collected on behalf of third parties. We recognize revenue when we satisfy a performance obligation by transferring control over a product or service to a customer. Payments for our products and services are generally due within normal commercial terms. The following is a description of principal activities from which we generate our revenue, separated by reportable segments. See Note 3 for a further discussion regarding our reportable segments. Railcar Leasing and Management Services Group In our Railcar Leasing and Management Services Group ("Leasing Group"), revenue from rentals and operating leases, including contracts that contain non-level fixed lease payments, is recognized monthly on a straight-line basis. Leases not classified as operating leases are generally considered sales-type leases as a result of an option to purchase. We review our operating lease receivables for collectibility on a regular basis, taking into consideration changes in factors such as the lessee’s payment history, the financial condition of the lessee, and business and economic conditions in the industry in which the lessee operates. In the event that the collectibility of a receivable with respect to any lessee is no longer probable, we derecognize the revenue and related receivable and recognize future revenue only when the lessee makes a rental payment. Contingent rents are recognized when the contingency is resolved. Selling profit or loss associated with sales-type leases is recognized upon lease commencement, and a net investment in the sales-type lease is recorded on the Consolidated Balance Sheet. Interest income related to sales-type leases is recognized over the lease term using the effective interest method. We had no sales-type leases as of September 30, 2021 and December 31, 2020. During the fourth quarter of 2020, we began presenting sales from our lease fleet in the Railcar Leasing and Management Services Group on a net basis regardless of the age of railcar that is sold. Historically, in accordance with ASC 606, Revenue from contracts with customers , we presented sales of railcars from the lease fleet on a gross basis in Revenues – Leasing and Cost of revenues – Leasing in our Consolidated Statements of Operations if the railcars had been owned for one year or less at the time of sale. Sales of railcars from the lease fleet owned for more than one year had historically been presented as a net gain or loss from the disposal of a long-term asset. We now report all sales of railcars from the lease fleet as a net gain or loss from the disposal of a long-term asset in accordance with ASC 610-20, Gains and losses from the derecognition of non-financial assets. These sales are presented in the Lease portfolio sales line in our Consolidated Statements of Operations; however, because this change in presentation was effected on a prospective basis beginning in the fourth quarter of 2020, lease portfolio sales for the three and nine months ended September 30, 2020 only include sales of railcars from the lease fleet owned for more than one year. We have concluded that the new presentation is appropriate given the significant change in the strategic focus of the Company. The new presentation had no effect on the Company’s operating profit, net income, earnings per share, or Consolidated Balance Sheet. We account for shipping and handling costs as activities to fulfill the promise to transfer the good; as such, these fees are recorded in revenue. The fees and costs of shipping and handling activities are accrued when the related performance obligation has been satisfied. Rail Products Group Our railcar manufacturing business recognizes revenue when the customer has submitted its certificate of acceptance and legal title of the railcar has passed to the customer. Certain contracts for the sales of railcars include price adjustments based on steel-price indices; this amount represents variable consideration for which we are unable to estimate the final consideration until the railcar is delivered. Within our maintenance services business, revenue is recognized over time as repair and maintenance projects are completed, using an input approach based on the costs incurred relative to the total estimated costs of performing the project. We recorded contract assets of $5.8 million and $4.4 million as of September 30, 2021 and December 31, 2020, respectively, related to unbilled revenues recognized on repair and maintenance services that have been performed, but for which the entire project has not yet been completed, and the railcar has not yet been shipped to the customer. These contract assets are included within the Receivables, net of allowance line in our Consolidated Balance Sheets. All Other Our highway products business recognizes revenue when shipment has occurred and legal title of the product has passed to the customer. Unsatisfied Performance Obligations The following table includes estimated revenue expected to be recognized in future periods related to performance obligations that are unsatisfied or partially satisfied as of September 30, 2021 and the percentage of the outstanding performance obligations as of September 30, 2021 expected to be delivered during the remainder of 2021: Unsatisfied performance obligations at September 30, 2021 Total Percent expected to be delivered in 2021 (in millions) Rail Products Group: New railcars: External customers $ 980.9 Leasing Group 247.5 $ 1,228.4 31.8 % Sustainable railcar conversions (1) $ 98.3 25.8 % Maintenance services $ 3.1 100.0 % Railcar Leasing and Management Services Group $ 81.2 8.1 % (1) During 2021, the Rail Products Group introduced a sustainable railcar conversion program whereby certain tank cars and freight cars are converted or upgraded to better meet the changing market demands. The remainder of the unsatisfied performance obligations for the Rail Products Group is expected to be delivered through 2025. Unsatisfied performance obligations for the Railcar Leasing and Management Services Group are related to servicing, maintenance, and management agreements and are expected to be performed through 2029.
Lessee, Leases [Policy Text Block]	Lessee We are the lessee of operating leases predominantly for railcars, as well as office buildings, manufacturing equipment, and office equipment. Our operating leases have remaining lease terms ranging from one year to sixteen years, some of which include options to extend for up to five years, and some of which include options to terminate within one year. As of September 30, 2021, we had no material finance leases in which we were the lessee. Certain of our operating leases include lease incentives, which reduce the right-of-use asset and are recognized on a straight-line basis over the lease term. As applicable, the lease liability is also reduced by the amount of lease incentives that have not yet been reimbursed by the lessor. The following table summarizes the impact of our operating leases on our Consolidated Financial Statements (in millions, except lease term and discount rate): Three Months Ended Nine Months Ended 2021 2020 2021 2020 Consolidated Statements of Operations Operating lease expense $ 4.2 $ 3.7 $ 12.1 $ 12.2 Short-term lease expense $ — $ 0.7 $ 0.2 $ 2.1 September 30, 2021 December 31, 2020 Consolidated Balance Sheets Right-of-use assets (1) $ 92.2 $ 77.1 Lease liabilities (2) $ 116.2 $ 96.9 Weighted average remaining lease term 10.5 years 11.3 years Weighted average discount rate 3.0 % 3.3 % Nine Months Ended 2021 2020 Consolidated Statements of Cash Flows Cash flows from operating activities $ 12.1 $ 12.2 Right-of-use assets recognized in exchange for new lease liabilities (3) $ 26.6 $ 53.6 (1) Included in other assets in our Consolidated Balance Sheets. (2) Included in other liabilities in our Consolidated Balance Sheets. (3) Includes the commencement of the new headquarters facility for the nine months ended September 30, 2020. Future contractual minimum operating lease liabilities will mature as follows (in millions): Leasing Group Non-Leasing Group Total Remaining three months of 2021 $ 2.9 $ 1.1 $ 4.0 2022 11.1 8.2 19.3 2023 9.3 8.2 17.5 2024 5.9 7.0 12.9 2025 4.0 6.3 10.3 Thereafter 8.1 64.8 72.9 Total operating lease payments $ 41.3 $ 95.6 $ 136.9 Less: Present value adjustment (20.7) Total operating lease liabilities $ 116.2
Lessor, Leases [Policy Text Block]	Lessor Our Leasing Group enters into railcar operating leases with third parties with terms generally ranging between one year and ten years. The majority of our fleet operates on leases that earn fixed monthly lease payments. Generally, lease payments are due at the beginning of the applicable month. A portion of our fleet operates on per diem leases that earn usage-based variable lease payments. Some of our leases include options to extend the leases for up to five years, and a small percentage of our leases include options to terminate within one year with certain notice requirements and early termination penalties. As of September 30, 2021, non-Leasing Group operating leases were not significant, and we had no sales-type leases and no direct finance leases. We manage risks associated with residual values of leased railcars by investing across a diverse portfolio of railcar types, staggering lease maturities within any given railcar type, avoiding concentration of railcar type and industry, and are active participants in secondary markets. Additionally, our lease agreements contain normal wear and tear return condition provisions and high mileage thresholds designed to protect the value of our residual assets. Our lease agreements do not contain any material residual value guarantees or restrictive covenants. The following table summarizes the impact of our leases on our Consolidated Statements of Operations: Three Months Ended Nine Months Ended 2021 2020 2021 2020 (in millions) Operating lease revenues $ 158.2 $ 169.1 $ 486.2 $ 506.4 Variable operating lease revenues $ 18.8 $ 9.0 $ 44.7 $ 32.2 Future contractual minimum revenues for operating leases will mature as follows (in millions) (1) : Remaining three months of 2021 $ 146.7 2022 497.6 2023 374.8 2024 280.2 2025 198.0 Thereafter 344.4 Total $ 1,841.7 (1) Total contractual minimum rental revenues on operating leases relates to our wholly-owned and partially-owned subsidiaries and sub-lease rental revenues associated with the Leasing Group's operating lease obligations.
Cash and Cash Equivalents, Policy [Policy Text Block]	Financial Instruments We consider all highly liquid debt instruments to be either cash and cash equivalents if purchased with a maturity of three months or less, or short-term marketable securities if purchased with a maturity of more than three months and less than one year. Financial instruments that potentially subject us to a concentration of credit risk are primarily cash investments including restricted cash and receivables. We place our cash investments in bank deposits and investment grade, short-term debt instruments and limit the amount of credit exposure to any one commercial issuer. The carrying values of cash, receivables, and accounts payable are considered to be representative of their respective fair values. Concentrations of credit risk with respect to receivables are limited due to control procedures that monitor the credit worthiness of customers, the large number of customers in our customer base, and their dispersion across different end markets and geographic areas. Receivables are generally evaluated at a portfolio level based on these characteristics. As receivables are generally unsecured, we maintain an allowance for credit losses using a forward-looking approach based on historical losses and consideration of current and expected future economic conditions. Historically, we have observed that the likelihood of loss increases when receivables have aged beyond 180 days. When a receivable is deemed uncollectible, the write-off is recorded as a reduction to allowance for credit losses. The balance of the allowance for credit losses that are in the scope of ASC 326, Financial Instruments - Credit Losses was $10.1 million and $9.3 million at September 30, 2021 and December 31, 2020, respectively. This balance excludes the general reserve for operating lease receivables that is permitted under ASC 450, Contingencies
Business Combinations Policy	Acquisitions In January 2021, we completed the acquisition of a company that owns and operates proprietary railcar cleaning technology systems. This transaction was recorded as a business combination within the Rail Products Group, based on valuations of the acquired assets and liabilities at their acquisition date fair value using Level 3 inputs. The acquisition did not have a significant impact on our Consolidated Financial Statements. This transaction resulted in goodwill of $7.0 million. There was no acquisition activity for the three and nine months ended September 30, 2020.
Goodwill Disclosure [Text Block]	Goodwill As of September 30, 2021 and December 31, 2020, the carrying amount of our goodwill totaled $215.8 million and $208.8 million, respectively, which is primarily attributable to the Rail Products Group.
Product Warranty Disclosure [Text Block]	Warranties We provide various express, limited product warranties that generally range from one year to five years depending on the product. The warranty costs are estimated using a two-step approach. First, an engineering estimate is made for the cost of all claims that have been asserted by customers. Second, based on historical claims experience, a cost is accrued for all products still within a warranty period for which no claims have been filed. We provide for the estimated cost of product warranties at the time revenue is recognized related to products covered by warranties and assess the adequacy of the resulting reserves on a quarterly basis. The changes in the accruals for warranties for the three and nine months ended September 30, 2021 and 2020 are as follows: Three Months Ended Nine Months Ended 2021 2020 2021 2020 (in millions) Beginning balance $ 5.8 $ 9.5 $ 11.7 $ 8.1 Warranty costs incurred (3.4) (0.3) (6.4) (1.8) Warranty originations and revisions 1.7 0.3 (0.7) 3.3 Warranty expirations (0.2) (0.3) (0.7) (0.4) Ending balance $ 3.9 $ 9.2 $ 3.9 $ 9.2

Derivative Instruments and Fa_2

Derivative Instruments and Fair Value Accounting Derivatives (Policies)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	See Note 7 for a description of our debt instruments. Interest Rate Hedges Included in accompanying balance sheet at September 30, 2021 AOCL – loss/(income) Notional Amount Interest Rate (1) Asset/(Liability) Controlling Interest Noncontrolling Interest (in millions, except %) Expired hedges: 2018 secured railcar equipment notes $ 249.3 4.41 % $ — $ 0.7 $ — TRIP Holdings warehouse loan $ 788.5 3.60 % $ — $ 0.7 $ 1.0 2017 promissory notes – interest rate cap $ 169.3 3.00 % $ — $ (0.4) $ — Open hedge: 2017 promissory notes – interest rate swap $ 468.0 2.66 % $ (28.9) $ 28.5 $ — (1) Weighted average fixed interest rate, except for the interest rate cap on the 2017 promissory notes. Effect on interest expense – increase/(decrease) Three Months Ended Nine Months Ended Expected effect during next twelve months 2021 2020 2021 2020 (in millions) Expired hedges: 2006 secured railcar equipment notes $ — $ — $ — $ (0.1) $ — 2018 secured railcar equipment notes $ 0.1 $ 0.1 $ 0.2 $ 0.2 $ 0.2 TRIP Holdings warehouse loan $ 0.4 $ 0.5 $ 1.4 $ 1.5 $ 1.4 Triumph Rail secured railcar equipment notes $ — $ 0.1 $ 0.1 $ 0.2 $ — 2017 promissory notes – interest rate cap $ (0.1) $ (0.1) $ (0.1) $ (0.1) $ (0.1) Open hedge (1) : 2017 promissory notes – interest rate swap $ 3.1 $ 3.1 $ 9.3 $ 7.8 $ 12.4 (1) Based on the fair value of open hedges as of September 30, 2021. Other Derivatives Our exposure related to foreign currency transactions is currently hedged for up to a maximum of twelve months. The effect of commodity hedge transactions was immaterial to the Consolidated Financial Statements for all periods presented herein. Information related to our foreign currency hedge is as follows: Included in accompanying balance sheet at September 30, 2021 Effect on cost of revenues – increase/(decrease) Notional Asset/(Liability) AOCL – Three Months Ended Nine Months Ended Expected effect during next twelve months (1) 2021 2020 2021 2020 (in millions) $ 60.0 $ (0.9) $ 0.6 $ (1.4) $ 2.3 $ (7.4) $ 4.1 $ 0.6 (1) Based on the fair value of open hedges as of September 30, 2021.

Common Stock and Stock-Based _2

Common Stock and Stock-Based Compensation Stockholders Equity (Policies)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Stockholders' Equity, Policy [Policy Text Block]	Stockholders' Equity Repurchase Agreement with ValueAct On April 29, 2021, we entered into a stock repurchase agreement with ValueAct Capital Master Fund, L.P. (“ValueAct”), the Company's largest shareholder and a related party, to repurchase 8.1 million shares of our common stock for $27.47 per share, for an aggregate purchase price of $222.5 million, in a privately negotiated transaction. The price per share represents a discount of 3.5% from the closing price for a share of common stock on the New York Stock Exchange on April 29, 2021. The repurchase from ValueAct was approved by our Board of Directors separately from, and did not reduce the authorized amount remaining under, the previous share repurchase program described below. New Share Repurchase Authorization In September 2021, our Board of Directors authorized a new share repurchase program effective September 9, 2021 through December 31, 2022. The new share repurchase program authorizes the Company to repurchase up to $250.0 million of its common stock. There were no shares repurchased under this program during the three months ended September 30, 2021. Previous Share Repurchase Authorization In October 2020, our Board of Directors authorized a share repurchase program effective October 23, 2020 through December 31, 2021. The share repurchase program authorized the Company to repurchase up to $250.0 million of its common stock and was completed in the third quarter of 2021. Share repurchase activity under this program is as follows: Shares Repurchased Remaining Authorization to Repurchase Period Number of shares Cost Cost October 23, 2020 Authorization $ 250.0 October 23, 2020 through December 31, 2020 2,974,922 $ 67.8 $ 182.2 January 1, 2021 through March 31, 2021 1,291,860 36.8 $ 145.4 April 1, 2021 through June 30, 2021 2,440,793 68.3 $ 77.1 July 1, 2021 through September 30, 2021 2,815,307 77.1 $ — Total 9,522,882 $ 250.0
Share-based Payment Arrangement [Text Block]	Stock-Based Compensation Stock-based compensation totaled approximately $6.5 million and $16.3 million for the three and nine months ended September 30, 2021, respectively. Stock-based compensation totaled approximately $4.8 million and $19.7 million for the three and nine months ended September 30, 2020, respectively. The Company's annual grant of share-based awards generally occurs in the second quarter under our 2004 Fourth Amended and Restated Stock Option and Incentive Plan (the "Plan”). Our stock options have contractual terms of ten years. Expense related to stock options issued to eligible employees under the Plan is recognized on a straight-line basis over their vesting period. Expense related to restricted stock units ("RSUs") issued to eligible employees under the Plan is recognized ratably over the vesting period, generally between three years and four years. Beginning in 2020, certain RSU grants provide for full vesting when the award recipients reach 60 years of age and have provided at least 10 years of service to the Company, provided that the awards remain outstanding for a period of six months from the date of grant. The expense for these awards is recognized over the applicable service period for each of the eligible award recipients. Expense related to RSUs and restricted stock awards ("RSAs") granted to non-employee directors under the Plan is recognized ratably over the vesting period, generally one year. Expense related to performance units is recognized ratably from their award date to the end of the performance period, generally three years. The following table summarizes stock-based compensation awards granted during the nine months ended September 30, 2021: Number of Shares Granted Weighted Average Grant-Date Fair Value per Award Restricted stock units 617,165 $ 28.40 Restricted stock awards 22,734 $ 28.48 Performance units 240,931 $ 30.85

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Remaining Performance Obligation	Unsatisfied Performance Obligations The following table includes estimated revenue expected to be recognized in future periods related to performance obligations that are unsatisfied or partially satisfied as of September 30, 2021 and the percentage of the outstanding performance obligations as of September 30, 2021 expected to be delivered during the remainder of 2021: Unsatisfied performance obligations at September 30, 2021 Total Percent expected to be delivered in 2021 (in millions) Rail Products Group: New railcars: External customers $ 980.9 Leasing Group 247.5 $ 1,228.4 31.8 % Sustainable railcar conversions (1) $ 98.3 25.8 % Maintenance services $ 3.1 100.0 % Railcar Leasing and Management Services Group $ 81.2 8.1 %
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Future contractual minimum operating lease liabilities will mature as follows (in millions): Leasing Group Non-Leasing Group Total Remaining three months of 2021 $ 2.9 $ 1.1 $ 4.0 2022 11.1 8.2 19.3 2023 9.3 8.2 17.5 2024 5.9 7.0 12.9 2025 4.0 6.3 10.3 Thereafter 8.1 64.8 72.9 Total operating lease payments $ 41.3 $ 95.6 $ 136.9 Less: Present value adjustment (20.7) Total operating lease liabilities $ 116.2
Lessor, Payments to be Received, Maturity [Table Text Block]	Future contractual minimum revenues for operating leases will mature as follows (in millions) (1) : Remaining three months of 2021 $ 146.7 2022 497.6 2023 374.8 2024 280.2 2025 198.0 Thereafter 344.4 Total $ 1,841.7 (1) Total contractual minimum rental revenues on operating leases relates to our wholly-owned and partially-owned subsidiaries and sub-lease rental revenues associated with the Leasing Group's operating lease obligations.
Schedule of Product Warranty Liability [Table Text Block]	The changes in the accruals for warranties for the three and nine months ended September 30, 2021 and 2020 are as follows: Three Months Ended Nine Months Ended 2021 2020 2021 2020 (in millions) Beginning balance $ 5.8 $ 9.5 $ 11.7 $ 8.1 Warranty costs incurred (3.4) (0.3) (6.4) (1.8) Warranty originations and revisions 1.7 0.3 (0.7) 3.3 Warranty expirations (0.2) (0.3) (0.7) (0.4) Ending balance $ 3.9 $ 9.2 $ 3.9 $ 9.2

Derivative Instruments and Fa_3

Derivative Instruments and Fair Value Accounting Derivatives and Hedging (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Schedule of Interest Rate Derivatives [Table Text Block]	Included in accompanying balance sheet at September 30, 2021 AOCL – loss/(income) Notional Amount Interest Rate (1) Asset/(Liability) Controlling Interest Noncontrolling Interest (in millions, except %) Expired hedges: 2018 secured railcar equipment notes $ 249.3 4.41 % $ — $ 0.7 $ — TRIP Holdings warehouse loan $ 788.5 3.60 % $ — $ 0.7 $ 1.0 2017 promissory notes – interest rate cap $ 169.3 3.00 % $ — $ (0.4) $ — Open hedge: 2017 promissory notes – interest rate swap $ 468.0 2.66 % $ (28.9) $ 28.5 $ — (1) Weighted average fixed interest rate, except for the interest rate cap on the 2017 promissory notes.
Derivative Instruments, Gain (Loss)	Effect on interest expense – increase/(decrease) Three Months Ended Nine Months Ended Expected effect during next twelve months 2021 2020 2021 2020 (in millions) Expired hedges: 2006 secured railcar equipment notes $ — $ — $ — $ (0.1) $ — 2018 secured railcar equipment notes $ 0.1 $ 0.1 $ 0.2 $ 0.2 $ 0.2 TRIP Holdings warehouse loan $ 0.4 $ 0.5 $ 1.4 $ 1.5 $ 1.4 Triumph Rail secured railcar equipment notes $ — $ 0.1 $ 0.1 $ 0.2 $ — 2017 promissory notes – interest rate cap $ (0.1) $ (0.1) $ (0.1) $ (0.1) $ (0.1) Open hedge (1) : 2017 promissory notes – interest rate swap $ 3.1 $ 3.1 $ 9.3 $ 7.8 $ 12.4 (1) Based on the fair value of open hedges as of September 30, 2021. Other Derivatives Our exposure related to foreign currency transactions is currently hedged for up to a maximum of twelve months. The effect of commodity hedge transactions was immaterial to the Consolidated Financial Statements for all periods presented herein. Information related to our foreign currency hedge is as follows: Included in accompanying balance sheet at September 30, 2021 Effect on cost of revenues – increase/(decrease) Notional Asset/(Liability) AOCL – Three Months Ended Nine Months Ended Expected effect during next twelve months (1) 2021 2020 2021 2020 (in millions) $ 60.0 $ (0.9) $ 0.6 $ (1.4) $ 2.3 $ (7.4) $ 4.1 $ 0.6 (1) Based on the fair value of open hedges as of September 30, 2021.
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The assets measured as Level 1 in the fair value hierarchy are summarized below: Level 1 September 30, 2021 December 31, 2020 (in millions) Assets: Cash equivalents $ 8.4 $ 24.2 Restricted cash 123.3 96.4 Total assets $ 131.7 $ 120.6
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The assets and liabilities measured as Level 2 in the fair value hierarchy are summarized below: Level 2 September 30, 2021 December 31, 2020 (in millions) Assets: Foreign currency hedge (1) $ — $ 4.8 Total assets $ — $ 4.8 Liabilities: Interest rate hedge (2) $ 28.9 $ 45.2 Foreign currency hedge (2) 0.9 — Total liabilities $ 29.8 $ 45.2 (1) Included in other assets in our Consolidated Balance Sheets. (2) Included in accrued liabilities in our Consolidated Balance Sheets.

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Three Months Ended Nine Months Ended September 30, 2021 2020 2021 2020 (in millions) Operating profit (loss): Railcar Leasing and Management Services Group $ 109.3 $ 89.7 $ 268.7 $ 265.5 Rail Products Group (3.1) 3.2 (8.7) 36.2 All Other 14.7 7.3 42.8 23.9 Segment Totals before Eliminations, Corporate Expenses, Impairment of long-lived assets, and Restructuring activities 120.9 100.2 302.8 325.6 Corporate (23.9) (21.0) (73.7) (73.3) Impairment of long-lived assets — — — (369.4) Restructuring activities, net 0.1 (4.7) 1.1 (10.5) Eliminations – Lease Subsidiary (4.5) (2.6) (9.3) (33.5) Eliminations – Other (0.4) 1.0 (1.1) (0.3) Consolidated operating profit (loss) 92.2 72.9 219.8 (161.4) Other (income) expense 44.5 53.7 160.5 164.1 Provision (benefit) for income taxes 11.4 (6.7) 16.5 (226.1) Loss from discontinued operations, net of income taxes (0.4) — (0.8) (0.2) Net income (loss) $ 35.9 $ 25.9 $ 42.0 $ (99.6)

Railcar Leasing and Managemen_2

Railcar Leasing and Management Services Group (Tables)	9 Months Ended
	Sep. 30, 2021
Sale Leaseback Transaction [Line Items]
Selected consolidating financial information for the Leasing Group	Selected consolidated financial information for the Leasing Group is as follows: September 30, 2021 Wholly- Partially-Owned Subsidiaries Total Leasing Group Eliminations – Lease Subsidiary (1) Adjusted Total Leasing Group (in millions) Cash and cash equivalents $ 2.6 $ — $ 2.6 $ — $ 2.6 Accounts receivable 101.9 11.4 113.3 — 113.3 Property, plant, and equipment, net 5,603.4 1,594.7 7,198.1 (782.6) 6,415.5 Restricted cash 81.1 42.2 123.3 — 123.3 Other assets 63.3 1.3 64.6 — 64.6 Total assets $ 5,852.3 $ 1,649.6 $ 7,501.9 $ (782.6) $ 6,719.3 Accounts payable and accrued liabilities $ 137.7 $ 33.7 $ 171.4 $ — $ 171.4 Debt, net 3,553.5 1,224.5 4,778.0 — 4,778.0 Deferred income taxes 1,087.4 1.1 1,088.5 (180.2) 908.3 Other liabilities 39.1 — 39.1 — 39.1 Total liabilities 4,817.7 1,259.3 6,077.0 (180.2) 5,896.8 Noncontrolling interest — 265.4 265.4 — 265.4 Total Equity $ 1,034.6 $ 124.9 $ 1,159.5 $ (602.4) $ 557.1 December 31, 2020 Wholly- Partially-Owned Subsidiaries Total Leasing Group Eliminations – Lease Subsidiary (1) Adjusted Total Leasing Group (in millions) Cash and cash equivalents $ 3.5 $ — $ 3.5 $ — $ 3.5 Accounts receivable 82.0 8.4 90.4 — 90.4 Property, plant, and equipment, net 5,795.9 1,626.3 7,422.2 (820.3) 6,601.9 Restricted cash 65.2 31.1 96.3 — 96.3 Other assets 38.1 1.6 39.7 — 39.7 Total assets $ 5,984.7 $ 1,667.4 $ 7,652.1 $ (820.3) $ 6,831.8 Accounts payable and accrued liabilities $ 141.4 $ 30.9 $ 172.3 $ — $ 172.3 Debt, net 3,340.5 1,228.3 4,568.8 — 4,568.8 Deferred income taxes 1,062.3 1.1 1,063.4 (186.2) 877.2 Other liabilities 25.7 — 25.7 — 25.7 Total liabilities 4,569.9 1,260.3 5,830.2 (186.2) 5,644.0 Noncontrolling interest — 277.2 277.2 — 277.2 Total Equity $ 1,414.8 $ 129.9 $ 1,544.7 $ (634.1) $ 910.6
Selected consolidating income statement information for the Leasing Group	Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 Percent 2021 2020 Percent ($ in millions) Change ($ in millions) Change Revenues: Leasing and management $ 185.5 $ 183.9 0.9 % $ 554.1 $ 558.6 (0.8) % Sales of railcars owned one year or less at the time of sale (1) — — * — 54.4 (100.0) % Total revenues $ 185.5 $ 183.9 0.9 % $ 554.1 $ 613.0 (9.6) % Operating profit (2) : Leasing and management $ 76.4 $ 86.8 (12.0) % $ 223.0 $ 247.8 (10.0) % Lease portfolio sales (1) $ 32.9 $ 2.9 * 45.7 17.7 158.2 % Total operating profit $ 109.3 $ 89.7 21.9 % $ 268.7 $ 265.5 1.2 % Total operating profit margin 58.9 % 48.8 % 48.5 % 43.3 % Leasing and management operating profit margin 41.2 % 47.2 % 40.2 % 44.4 % Selected expense information: Depreciation (3) $ 58.7 $ 51.5 14.0 % $ 170.5 $ 159.1 7.2 % Maintenance and compliance $ 22.8 $ 18.5 23.2 % $ 73.7 $ 67.4 9.3 % Rent $ 1.9 $ 2.1 (9.5) % $ 5.3 $ 8.1 (34.6) % Selling, engineering, and administrative expenses $ 11.6 $ 11.7 (0.9) % $ 36.1 $ 39.0 (7.4) % Interest (4) $ 39.9 $ 47.0 (15.1) % $ 142.6 $ 149.2 (4.4) % * Not meaningful (1) Beginning in the fourth quarter of 2020, we made a prospective change in the presentation of sales of railcars from the lease fleet. Therefore, all railcar sales for the three and nine months ended September 30, 2021 are presented as a net gain or loss from the disposal of a long-term asset regardless of the age of railcar that is sold. See Note 1 for more information. (2) Operating profit includes: depreciation; maintenance and compliance; rent; and selling, engineering, and administrative expenses. Amortization of deferred profit on railcars sold from the Rail Products Group to the Leasing Group is included in the operating profit of the Leasing Group, resulting in the recognition of depreciation expense based on our original manufacturing cost of the railcars. Interest expense is not a component of operating profit and includes the effect of hedges. (3) Depreciation expense increased $4.7 million and $7.3 million for the three and nine months ended September 30, 2021, respectively, as a result of the disposal of certain railcar components associated with our sustainable railcar conversion program. Additionally, depreciation expense related to our small cube covered hopper railcars decreased by approximately $7.0 million for the nine months ended September 30, 2021 relative to the nine months ended September 30, 2020 as a result of the impairment charge recorded in the second quarter of 2020 related to these railcars. (4) Interest expense for the nine months ended September 30, 2021 includes $11.7 million of loss on extinguishment of debt associated with the refinancing of our partially-owned subsidiaries' debt. See Note 7 for more information. Interest expense for the nine months ended September 30, 2020 includes $5.0 million of loss on extinguishment of debt associated with the early redemption of debt.
Schedule of proceeds from leased railcars	Information related to lease portfolio sales is as follows: Three Months Ended Nine Months Ended 2021 2020 2021 2020 (in millions) Lease portfolio sales $ 322.1 $ 6.5 $ 410.9 $ 193.1 Operating profit on lease portfolio sales $ 32.9 $ 2.9 $ 45.7 $ 17.7 Operating profit margin on lease portfolio sales 10.2 % 44.6 % 11.1 % 9.2 %
Future contractual minimum rental revenues on leases	Future contractual minimum rental revenues on operating leases related to our wholly-owned and partially-owned subsidiaries are as follows: Remaining three months of 2021 2022 2023 2024 2025 Thereafter Total (in millions) Future contractual minimum rental revenues $ 145.1 $ 492.6 $ 371.8 $ 278.1 $ 196.8 $ 343.7 $ 1,828.1
Operating leases
Sale Leaseback Transaction [Line Items]
Future operating lease obligations and future contractual minimum rental revenues	Future amounts due as well as future contractual minimum rental revenues related to the Leasing Group's railcar operating lease obligations are as follows: Remaining three months of 2021 2022 2023 2024 2025 Thereafter Total (in millions) Future operating lease obligations $ 2.8 $ 10.8 $ 9.0 $ 5.5 $ 3.7 $ 7.8 $ 39.6 Future contractual minimum rental revenues $ 1.6 $ 5.0 $ 3.0 $ 2.1 $ 1.2 $ 0.7 $ 13.6

Property, Plant, and Equipment

Property, Plant, and Equipment (Tables)	9 Months Ended
	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment [Table Text Block]	The following table summarizes the components of property, plant, and equipment: September 30, 2021 December 31, 2020 (in millions) Manufacturing/Corporate: Land $ 22.0 $ 23.2 Buildings and improvements 423.8 428.6 Machinery and other 481.6 485.1 Construction in progress 18.7 42.5 946.1 979.4 Less: accumulated depreciation (561.5) (577.9) 384.6 401.5 Leasing: Wholly-owned subsidiaries: Machinery and other 20.1 19.5 Equipment on lease 6,917.3 7,010.6 6,937.4 7,030.1 Less: accumulated depreciation (1,334.0) (1,234.2) 5,603.4 5,795.9 Partially-owned subsidiaries: Equipment on lease 2,258.9 2,248.2 Less: accumulated depreciation (664.2) (621.9) 1,594.7 1,626.3 Deferred profit on railcars sold to the Leasing Group (1,044.7) (1,064.7) Less: accumulated amortization 262.1 244.4 (782.6) (820.3) $ 6,800.1 $ 7,003.4

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Components of debt	The carrying amounts of our long-term debt are as follows: September 30, 2021 December 31, 2020 (in millions) Corporate – Recourse: Revolving credit facility $ — $ 50.0 Senior notes, net of unamortized discount of $0.2 and $0.2 399.8 399.8 399.8 449.8 Less: unamortized debt issuance costs (1.3) (1.6) Total recourse debt 398.5 448.2 Leasing – Non-recourse: Wholly-owned subsidiaries: Secured railcar equipment notes, net of unamortized discount of $0.5 and $0.6 2,293.3 2,042.4 2017 promissory notes, net of unamortized discount of $8.4 and $10.1 770.8 802.7 TILC warehouse facility 514.4 519.4 3,578.5 3,364.5 Less: unamortized debt issuance costs (25.0) (24.0) 3,553.5 3,340.5 Partially-owned subsidiaries: Secured railcar equipment notes, net of unamortized discount of $0.3 and $— 909.2 1,237.5 TRIP Railcar Co. term loan 327.0 — Less: unamortized debt issuance costs (11.7) (9.2) 1,224.5 1,228.3 Total non–recourse debt 4,778.0 4,568.8 Total debt $ 5,176.5 $ 5,017.0 September 30, 2021 December 31, 2020 (in millions) Level 1 $ 1,612.2 $ 1,372.1 Level 2 425.3 420.3 Level 3 3,295.6 3,462.4 $ 5,333.1 $ 5,254.8

Employee Retirement Plans (Tabl

Employee Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2021
Retirement Benefits [Abstract]
Schedule of Costs of Retirement Plans [Table Text Block]	The following table summarizes the components of our net retirement cost: Three Months Ended Nine Months Ended 2021 2020 2021 2020 (in millions) Expense Components Service cost $ — $ — $ — $ — Interest 0.1 3.8 0.3 11.2 Expected return on plan assets — (5.3) — (15.7) Amortization of actuarial loss — 1.5 0.2 4.5 Amortization of prior service cost — 0.3 — 0.9 Net periodic benefit cost 0.1 0.3 0.5 0.9 Profit sharing 3.1 1.9 8.3 6.5 Net expense $ 3.2 $ 2.2 $ 8.8 $ 7.4

Restructuring Activities (Table

Restructuring Activities (Tables)	9 Months Ended
	Sep. 30, 2021
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]	The following table sets forth the restructuring activity and balance of the restructuring liability, which is included in other liabilities in our Consolidated Balance Sheets: Accrued charges as of December 31, 2020 Charges and adjustments Payments Accrued charges as of September 30, 2021 (in millions) Cash charges: Employee severance costs $ 1.4 $ 0.5 $ (1.6) $ 0.3 $ 1.4 $ 0.5 $ (1.6) $ 0.3 Non-cash charges: Gain on disposition of assets $ (1.6) Total restructuring activities $ (1.1)
Restructuring and Related Costs [Table Text Block]	Although restructuring activities are not allocated to our reportable segments, the following tables summarize the restructuring activities by reportable segment: Three Months Ended September 30, 2021 Employee Severance Costs Gain on Disposition on Assets Total Railcar Leasing and Management Services Group $ — $ — $ — Rail Products Group 0.1 — $ 0.1 All Other — (0.2) $ (0.2) Corporate — — $ — Total restructuring activities $ 0.1 $ (0.2) $ (0.1) Three Months Ended September 30, 2020 Employee Severance Costs Contract Termination Costs Write-down of Assets Total (in millions) Railcar Leasing and Management Services Group $ 1.4 $ — $ — $ 1.4 Rail Products Group 1.3 0.2 0.7 2.2 All Other 0.1 — — 0.1 Corporate 0.6 0.4 — 1.0 Total restructuring activities $ 3.4 $ 0.6 $ 0.7 $ 4.7 Nine Months Ended September 30, 2021 Employee Severance Costs Gain on Disposition of Assets Total (in millions) Railcar Leasing and Management Services Group $ — $ — $ — Rail Products Group 0.4 — 0.4 All Other — (1.6) (1.6) Corporate 0.1 — 0.1 Total restructuring activities $ 0.5 $ (1.6) $ (1.1) Nine Months Ended September 30, 2020 Employee Severance Costs Contract Termination Costs Gain on Disposition of Assets Write-down of Assets Total (in millions) Railcar Leasing and Management Services Group $ 1.4 $ — $ — $ — $ 1.4 Rail Products Group 3.9 0.2 — 0.7 4.8 All Other 0.2 — (3.5) — (3.3) Corporate 2.0 0.4 — 5.2 7.6 Total restructuring activities $ 7.5 $ 0.6 $ (3.5) $ 5.9 $ 10.5

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Changes in AOCL for the nine months ended September 30, 2021 are as follows: Currency translation adjustments Unrealized gains/(losses) on derivative financial instruments Net actuarial gains/(losses) and prior service costs of defined benefit plans Accumulated Other Comprehensive Loss (in millions) Balances at December 31, 2020 $ (1.3) $ (25.6) $ (4.0) $ (30.9) Other comprehensive income, net of tax, before reclassifications — 5.0 — 5.0 Amounts reclassified from AOCL, net of tax benefit of $—, $0.6, $0.1, and $0.7 — 2.9 0.1 3.0 Less: noncontrolling interest — (1.0) — (1.0) Other comprehensive income — 6.9 0.1 7.0 Balances at September 30, 2021 $ (1.3) $ (18.7) $ (3.9) $ (23.9)

Common Stock and Stock-Based _3

Common Stock and Stock-Based Compensation Stock Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Repurchases [Table Text Block]	Share repurchase activity under this program is as follows: Shares Repurchased Remaining Authorization to Repurchase Period Number of shares Cost Cost October 23, 2020 Authorization $ 250.0 October 23, 2020 through December 31, 2020 2,974,922 $ 67.8 $ 182.2 January 1, 2021 through March 31, 2021 1,291,860 36.8 $ 145.4 April 1, 2021 through June 30, 2021 2,440,793 68.3 $ 77.1 July 1, 2021 through September 30, 2021 2,815,307 77.1 $ — Total 9,522,882 $ 250.0
Share-based Payment Arrangement, Activity [Table Text Block]	The following table summarizes stock-based compensation awards granted during the nine months ended September 30, 2021: Number of Shares Granted Weighted Average Grant-Date Fair Value per Award Restricted stock units 617,165 $ 28.40 Restricted stock awards 22,734 $ 28.48 Performance units 240,931 $ 30.85

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Computation of basic and diluted net income attributable to Trinity Industries, Inc.	The following table sets forth the computation of basic and diluted net income (loss) attributable to Trinity Industries, Inc. for the three and nine months ended September 30, 2021 and 2020. Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (in millions, except per share amounts) Income (loss) from continuing operations $ 36.3 $ 25.9 $ 42.8 $ (99.4) Less: Net (income) loss attributable to noncontrolling interest (3.9) (0.8) 6.0 79.5 Unvested restricted share participation – continuing operations — (0.2) — — Net income (loss) from continuing operations attributable to Trinity Industries, Inc. 32.4 24.9 48.8 (19.9) Net loss from discontinued operations, net of income taxes (0.4) — (0.8) (0.2) Unvested restricted share participation – discontinued operations — — — — Net loss from discontinued operations attributable to Trinity Industries, Inc. (0.4) — (0.8) (0.2) Net income (loss) attributable to Trinity Industries, Inc., including the effect of unvested restricted share participation $ 32.0 $ 24.9 $ 48.0 $ (20.1) Basic weighted average shares outstanding 97.7 116.4 103.4 117.2 Effect of dilutive securities 1.8 0.6 2.3 — Diluted weighted average shares outstanding 99.5 117.0 105.7 117.2 Basic earnings per common share: Income (loss) from continuing operations $ 0.33 $ 0.21 $ 0.47 $ (0.17) Income (loss) from discontinued operations — — (0.01) — Basic net income (loss) attributable to Trinity Industries, Inc. $ 0.33 $ 0.21 $ 0.46 $ (0.17) Diluted earnings per common share: Income (loss) from continuing operations $ 0.33 $ 0.21 $ 0.46 $ (0.17) Income (loss) from discontinued operations — — (0.01) — Diluted net income (loss) attributable to Trinity Industries, Inc. $ 0.33 $ 0.21 $ 0.45 $ (0.17) Potentially dilutive securities excluded from EPS calculation: Antidilutive restricted shares 0.1 0.3 0.1 — Antidilutive stock options — 0.3 — —

Summary of Significant Accoun_3

Summary of Significant Accounting Policies Revenue Recognition and Remaining performance obligation (Details) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Billed Contracts Receivable		$ 5.8	$ 4.4
Rail Products Group [Member] | Rail Products [Domain]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount		$ 1,228.4
Revenue, remaining performance obligation expected to be delivered in current year		31.80%
Rail Products Group [Member] | Rail Products [Domain] | External Customers
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount		$ 980.9
Rail Products Group [Member] | Rail Products [Domain] | Leasing
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount		247.5
Rail Products Group [Member] | Sustainable Railcar Conversions
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	[1]	$ 98.3
Revenue, remaining performance obligation expected to be delivered in current year		25.80%
Rail Products Group [Member] | Maintenance services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount		$ 3.1
Revenue, remaining performance obligation expected to be delivered in current year		100.00%
Railcar Leasing and Management Services Group [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount		$ 81.2
Revenue, remaining performance obligation expected to be delivered in current year		8.10%
[1]	During 2021, the Rail Products Group introduced a sustainable railcar conversion program whereby certain tank cars and freight cars are converted or upgraded to better meet the changing market demands.

Summary of Significant Accoun_4

Summary of Significant Accounting Policies Lessee Accounting (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020		Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term		5 years		5 years
Lessee, Operating Lease, Option to Terminate				one year
Finance Lease, Principal Payments				$ 0
Operating lease expense		$ 4.2	$ 3.7	12.1	$ 12.2
Short-term lease expense		0	$ 0.7	0.2	2.1
Right-of-use assets (1)	[1]	92.2		92.2			$ 77.1
Lease liabilities (2)	[2]	$ 116.2		$ 116.2			$ 96.9
Weighted average remaining lease term		10 years 6 months		10 years 6 months			11 years 3 months 18 days
Weighted average discount rate		3.00%		3.00%			3.30%
Cash flows from operating activities				$ 12.1	12.2
Right-of-use assets recognized in exchange for new lease liabilities (3)				26.6	$ 53.6	[3]
Remaining three months of 2021		$ 4		4
2022		19.3		19.3
2023		17.5		17.5
2024		12.9		12.9
2025		10.3		10.3
Thereafter		72.9		72.9
Lessee, Operating Lease, Liability, to be Paid, Total		136.9		136.9
Less: Present value adjustment		$ (20.7)		$ (20.7)
Minimum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract		1 year		1 year
Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract		16 years		16 years
Railcar Leasing and Management Services Group [Member]
Lessee, Lease, Description [Line Items]
Remaining three months of 2021		$ 2.9		$ 2.9
2022		11.1		11.1
2023		9.3		9.3
2024		5.9		5.9
2025		4		4
Thereafter		8.1		8.1
Lessee, Operating Lease, Liability, to be Paid, Total		41.3		41.3
Consolidated Subsidiaries, Excluding Leasing [Member]
Lessee, Lease, Description [Line Items]
Remaining three months of 2021		1.1		1.1
2022		8.2		8.2
2023		8.2		8.2
2024		7		7
2025		6.3		6.3
Thereafter		64.8		64.8
Lessee, Operating Lease, Liability, to be Paid, Total		$ 95.6		$ 95.6
[1]	Included in other assets in our Consolidated Balance Sheets.
[2]	Included in other liabilities in our Consolidated Balance Sheets.
[3]	Includes the commencement of the new headquarters facility for the nine months ended September 30, 2020

Summary of Significant Accoun_5

Summary of Significant Accounting Policies Lessor Accounting (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Renewal Term		5 years		5 years
Lessor, Operating Lease, Option to Terminate				one year
Sales-type lease revenues		$ 0		$ 0
Direct Financing Lease, Revenue		0		0
Operating lease revenues		158.2	$ 169.1	486.2	$ 506.4
Variable operating lease revenues		18.8	$ 9	44.7	$ 32.2
Railcar Leasing and Management Services Group [Member]
Lessor, Lease, Description [Line Items]
Remaining three months of 2021	[1]	146.7		146.7
2022	[1]	497.6		497.6
2023	[1]	374.8		374.8
2024	[1]	280.2		280.2
2025	[1]	198		198
Thereafter	[1]	344.4		344.4
Total	[1]	$ 1,841.7		$ 1,841.7
Minimum | Railcar Leasing and Management Services Group [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Term of Contract		1 year		1 year
Maximum | Railcar Leasing and Management Services Group [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Term of Contract		10 years		10 years
[1]	Total contractual minimum rental revenues on operating leases relates to our wholly-owned and partially-owned subsidiaries and sub-lease rental revenues associated with the Leasing Group's operating lease obligations.

Summary of Significant Accoun_6

Summary of Significant Accounting Policies Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Credit Loss [Abstract]
Accounts Receivable, Allowance for Credit Loss	$ 10.1	$ 9.3

Summary of Significant Accoun_7

Summary of Significant Accounting Policies Goodwill (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 215.8	$ 208.8
Goodwill, Acquired During Period	$ 7

Summary of Significant Accoun_8

Summary of Significant Accounting Policies Warranties (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Product Warranty Liability [Line Items]
Standard Product Warranty Accrual	$ 3.9	$ 9.2	$ 3.9	$ 9.2	$ 5.8	$ 11.7	$ 9.5	$ 8.1
Warranty costs incurred	(3.4)	(0.3)	(6.4)	(1.8)
Warranty originations and revisions	1.7	0.3	(0.7)	3.3
Warranty expirations	$ (0.2)	$ (0.3)	$ (0.7)	$ (0.4)
Minimum
Product Warranty Liability [Line Items]
Product Warranty Period			1 year
Maximum
Product Warranty Liability [Line Items]
Product Warranty Period			5 years

Derivative Instruments and Fa_4

Derivative Instruments and Fair Value Accounting Derivative Instruments (Details) - USD ($) $ in Millions		Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ 1,596.4	$ 1,657.9	$ 1,967.9	$ 2,016	$ 2,093.6	$ 2,160.4	$ 2,466.1	$ 2,378.9
Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, 2018 Secured Railcar Equipment Notes [Domain]
Derivative [Line Items]
Derivative, Notional Amount		$ 249.3
Derivative, Average Fixed Interest Rate	[1]	4.41%
Derivative Liability		$ 0
Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, TRIP Holdings Warehouse Loan [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 788.5
Derivative, Average Fixed Interest Rate	[1]	3.60%
Derivative Liability		$ 0
Designated as Hedging Instrument [Member] | Interest Rate Cap [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 169.3
Derivative, Cap Interest Rate		3.00%
Derivative Liability		$ 0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 468
Derivative, Average Fixed Interest Rate	[1]	2.66%
Derivative Liability		$ (28.9)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, 2018 Secured Railcar Equipment Notes [Domain]
Derivative [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		0.7
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, TRIP Holdings Warehouse Loan [Member]
Derivative [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		0.7
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Cap [Member]
Derivative [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		(0.4)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		28.5
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, 2018 Secured Railcar Equipment Notes [Domain]
Derivative [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, TRIP Holdings Warehouse Loan [Member]
Derivative [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		1
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Cap [Member]
Derivative [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ 0
[1]	(Mark One)

Derivative Instruments and Fa_5

Derivative Instruments and Fair Value Accounting Derivative Effect on Interest (Details) - Interest Expense [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest Rate Swap, Expired, 2006 Secured Railcar Equipment Notes [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		$ 0	$ 0	$ 0	$ 0.1
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net		0		0
Interest Rate Swap, Expired, 2018 Secured Railcar Equipment Notes [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(0.1)	(0.1)	(0.2)	(0.2)
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net		0.2		0.2
Interest Rate Swap, Expired, TRIP Holdings Warehouse Loan [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(0.4)	(0.5)	(1.4)	(1.5)
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net		1.4		1.4
Interest Rate Swap, Expired, TRIP Master Funding Secured Railcar Equipment Notes [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		0	(0.1)	(0.1)	(0.2)
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net		0		0
Interest Rate Cap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		0.1	0.1	0.1	0.1
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net		(0.1)		(0.1)
Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(3.1)	$ (3.1)	(9.3)	$ (7.8)
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	[1]	$ 12.4		$ 12.4
[1]	(Mark One)

Derivative Instruments and Fa_6

Derivative Instruments and Fair Value Accounting FX Hedge (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Foreign Currency Fair Value Hedge Derivative [Line Items]
Total stockholders' equity		$ 1,596.4	$ 2,093.6	$ 1,596.4	$ 2,093.6	$ 1,657.9	$ 1,967.9	$ 2,016	$ 2,160.4	$ 2,466.1	$ 2,378.9
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Foreign Currency Fair Value Hedge Derivative [Line Items]
Derivative, Notional Amount		60		60
Derivative Asset		(0.9)		(0.9)
Foreign Exchange Contract [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member]
Foreign Currency Fair Value Hedge Derivative [Line Items]
Total stockholders' equity		0.6		0.6
Foreign Exchange Contract [Member] | Interest Expense [Member] | Designated as Hedging Instrument [Member]
Foreign Currency Fair Value Hedge Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(1.4)	$ 2.3	(7.4)	$ 4.1
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	[1]	$ 0.6		$ 0.6
[1]	(Mark One)

Derivative Instruments and Fa_7

Derivative Instruments and Fair Value Accounting - Assets and liabilities Measured at fair value on recurring basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Level 1
Assets:
Cash equivalents		$ 8.4	$ 24.2
Restricted cash		123.3	96.4
Total assets		131.7	120.6
Level 2
Assets:
Total assets	[1]	0	4.8
Level 2 | Other Assets [Member]
Assets:
Foreign currency hedge (1)	[1]	0	4.8
Level 2 | Accrued Liabilities [Member]
Liabilities [Abstract]
Foreign currency hedge (2)	[2]	0.9	0
Total liabilities	[2]	29.8	45.2
Level 3
Assets:
Total assets		0	0
Interest Rate Swap [Member] | Level 2 | Accrued Liabilities [Member]
Liabilities [Abstract]
Interest rate hedge (2)	[2]	$ 28.9	$ 45.2
[1]	(Mark One)
[2]	(Mark One)

Segment Information - Financial

Segment Information - Financial information for segments (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
External Revenue	$ 503.5			$ 459.4			$ 1,273.8	$ 1,583.8
Total Revenues	503.5			459.4			1,273.8	1,583.8
Operating Profit (Loss)	92.2			72.9			219.8	(161.4)
Impairment of long-lived assets	0			0			0	(369.4)
Restructuring activities, net	0.1			(4.7)			1.1	(10.5)
Other (income) expense	44.5			53.7			160.5	164.1
Provision (benefit) for income taxes	11.4			(6.7)			16.5	(226.1)
Loss from discontinued operations, net of provision (benefit) for income taxes of $0.4, $—, $0.8, and $(0.1)	(0.4)			0			(0.8)	(0.2)
Net income (loss)	35.9	$ 4.8	$ 1.3	25.9	$ (287.8)	$ 162.3	42	(99.6)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	503.5			459.4			1,273.8	1,583.8
Operating Profit (Loss)	120.9			100.2			302.8	325.6
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment Revenue	0			0			0	0
Intersegment Eliminations [Member] | Consolidated Subsidiaries, Leasing [Member]
Segment Reporting Information [Line Items]
External Revenue	0			0			0	0
Intersegment Revenue	(105.3)			(166)			(367.6)	(512.4)
Total Revenues	(105.3)			(166)			(367.6)	(512.4)
Operating Profit (Loss)	(4.5)			(2.6)			(9.3)	(33.5)
Intersegment Eliminations [Member] | Consolidated Subsidiaries, Excluding Leasing [Member]
Segment Reporting Information [Line Items]
External Revenue	0			0			0	0
Intersegment Revenue	(0.3)			(2.3)			(5.4)	(8.3)
Total Revenues	(0.3)			(2.3)			(5.4)	(8.3)
Operating Profit (Loss)	(0.4)			1			(1.1)	(0.3)
Railcar Leasing and Management Services Group [Member]
Segment Reporting Information [Line Items]
External Revenue	185.3			183.7			553.6	612.4
Operating Profit (Loss)							268.7	265.5
Restructuring activities, net	0			(1.4)			0	(1.4)
Railcar Leasing and Management Services Group [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	185.5			183.9			554.1	613
Operating Profit (Loss)	109.3			89.7			268.7	265.5
Railcar Leasing and Management Services Group [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment Revenue	0.2			0.2			0.5	0.6
Rail Products Group [Member]
Segment Reporting Information [Line Items]
External Revenue	234.5			213.1			490.2	777.6
Operating Profit (Loss)							(8.7)	36.2
Restructuring activities, net	(0.1)			(2.2)			(0.4)	(4.8)
Rail Products Group [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	339.9			381.2			862.7	1,296.2
Operating Profit (Loss)	(3.1)			3.2
Rail Products Group [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment Revenue	105.4			168.1			372.5	518.6
All Other
Segment Reporting Information [Line Items]
External Revenue	83.7			62.6			230	193.8
Operating Profit (Loss)							42.8	23.9
Restructuring activities, net	0.2			(0.1)			1.6	3.3
All Other | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	83.7			62.6			230	195.3
Operating Profit (Loss)	14.7			7.3
All Other | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment Revenue	0			0			0	1.5
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Operating Profit (Loss)	(23.9)			(21)			(73.7)	(73.3)
Restructuring activities, net	$ 0			$ (1)			$ (0.1)	$ (7.6)

Segment Information - Narrative

Segment Information - Narrative (Details)	9 Months Ended
	Sep. 30, 2021segment
Segment Reporting [Abstract]
Number of Reportable Segments	3

Partially-Owned Leasing Subsi_2

Partially-Owned Leasing Subsidiaries - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)board_member	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)subsidiaryboard_member	Sep. 30, 2020USD ($)
Noncontrolling Interest [Line Items]
Gains on dispositions of property	$ 41.6	$ 3.9	$ 65.2	$ 20.1
Revenues	$ 503.5	$ 459.4	$ 1,273.8	$ 1,583.8
Signal Rail Holdings LLC
Noncontrolling Interest [Line Items]
Equity Method Investment, Ownership Percentage	10.00%		10.00%
Equity Method Investments	$ 6.1		$ 6.1
Proceeds from Sale of Property, Plant, and Equipment	318.7
Gains on dispositions of property	32.9
Aggregate Sales Price of Equipment Sold	325.1
Revenues	2.9
Proceeds from Equity Method Investment, Distribution	$ 6.4
Equity Method Investment, JV Majority Ownership Percentage	90.00%		90.00%
Equity Method Investment, Aggregate Future Estimated Investment of Railcars	$ 1,000		$ 1,000
Partially-owned subsidiaries
Noncontrolling Interest [Line Items]
Parent Company Guarantees	$ 0		$ 0
Railcar Leasing and Management Services Group [Member] | Partially-owned subsidiaries
Noncontrolling Interest [Line Items]
Number of Subsidiaries | subsidiary			2
Number of Board Members | board_member	7		7
Number of Board Members of Subsidiary, Designated by Parent | board_member	2		2
Partially-owned subsidiaries | Railcar Leasing and Management Services Group [Member]
Noncontrolling Interest [Line Items]
Carrying Value of Investment In Partially-Owned Consolidated Subsidiary	$ 139.5		$ 139.5
Noncontrolling Interest, Ownership Percentage by Parent	38.00%		38.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	62.00%		62.00%

Railcar Leasing and Managemen_3

Railcar Leasing and Management Services Group - Selected consolidating financial information for the Leasing Group (Details) - USD ($) $ in Millions		Sep. 30, 2021		Dec. 31, 2020
Segment Reporting Information [Line Items]
Cash and cash equivalents		$ 221.8		$ 132
Receivables, net of allowance		246.3		199
Property, Plant and Equipment, Net		6,800.1		7,003.4
Restricted cash		123.3		96.4
Other assets		292.9		295.2
Total assets		8,495.6		8,701.8
Total debt		5,176.5		5,017
Deferred income taxes		1,060.3		1,047.5
Other liabilities		157.4		150.2
Total liabilities		6,899.2		6,685.8
Noncontrolling interest		265.4		277.2
Total Equity		1,331		1,738.8
Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents		2.6		3.5
Receivables, net of allowance		113.3		90.4
Property, Plant and Equipment, Net		7,198.1		7,422.2
Restricted cash		123.3		96.3
Other assets		64.6		39.7
Total assets		7,501.9		7,652.1
Accounts payable and accrued liabilities		171.4		172.3
Total debt		4,778		4,568.8
Deferred income taxes		1,088.5		1,063.4
Other liabilities		39.1		25.7
Total liabilities		6,077		5,830.2
Noncontrolling interest		265.4		277.2
Total Equity		1,159.5		1,544.7
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net		(782.6)		(820.3)
Railcar Leasing and Management Services Group [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents		2.6		3.5
Receivables, net of allowance		113.3		90.4
Property, Plant and Equipment, Net		6,415.5		6,601.9
Restricted cash		123.3		96.3
Other assets		64.6		39.7
Total assets		6,719.3		6,831.8
Accounts payable and accrued liabilities		171.4		172.3
Total debt		4,778		4,568.8
Deferred income taxes		908.3		877.2
Other liabilities		39.1		25.7
Total liabilities		5,896.8		5,644
Noncontrolling interest		265.4		277.2
Total Equity		557.1		910.6
Wholly-owned subsidiaries | Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents		2.6		3.5
Receivables, net of allowance		101.9		82
Property, Plant and Equipment, Net		5,603.4		5,795.9
Restricted cash		81.1		65.2
Other assets		63.3		38.1
Total assets		5,852.3		5,984.7
Accounts payable and accrued liabilities		137.7		141.4
Total debt		3,553.5		3,340.5
Deferred income taxes		1,087.4		1,062.3
Other liabilities		39.1		25.7
Total liabilities		4,817.7		4,569.9
Noncontrolling interest		0		0
Total Equity		1,034.6		1,414.8
Partially-owned subsidiaries | Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents		0		0
Receivables, net of allowance		11.4		8.4
Property, Plant and Equipment, Net		1,594.7		1,626.3
Restricted cash		42.2		31.1
Other assets		1.3		1.6
Total assets		1,649.6		1,667.4
Accounts payable and accrued liabilities		33.7		30.9
Total debt		1,224.5		1,228.3
Deferred income taxes		1.1		1.1
Other liabilities		0		0
Total liabilities		1,259.3		1,260.3
Noncontrolling interest		265.4		277.2
Total Equity		124.9		129.9
Consolidated Subsidiaries, Leasing [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents		0		0
Receivables, net of allowance		0		0
Property, Plant and Equipment, Net	[1]	(782.6)		(820.3)
Restricted cash		0		0
Other assets		0		0
Total assets		(782.6)	[1]	(820.3)
Accounts payable and accrued liabilities		0		0
Total debt		0		0
Deferred income taxes	[1]	(180.2)		(186.2)
Other liabilities		0		0
Total liabilities	[1]	(180.2)		(186.2)
Noncontrolling interest		0		0
Total Equity	[1]	$ (602.4)		$ (634.1)
[1]	Net deferred profit on railcars sold to the Leasing Group consists of intersegment profit that is eliminated in consolidation. Net deferred profit and the related deferred tax impact are included as adjustments to the property, plant, and equipment, net and deferred income taxes line items, respectively, in the Eliminations – Lease Subsidiary column above to reflect the net book value of the railcars purchased by the Leasing Group from the Rail Products Group based on manufacturing cost. See Note 4 and Note 7 for a further discussion regarding our investment in our partially-owned leasing subsidiaries and the related indebtedness.

Railcar Leasing and Managemen_4

Railcar Leasing and Management Services Group - Selected consolidating income statement information for the Leasing Group (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2021		Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020
Revenues:
Revenues		$ 503.5		$ 459.4	$ 1,273.8		$ 1,583.8
Operating profit (2):
Total operating profit		92.2		72.9	219.8		(161.4)
Select expense information:
Depreciation (3)					206.3		199.5
Selling, engineering, and administrative expenses		54.3		51.2	166.4		172.3
Loss on extinguishment of debt		0		0	11.7		5
Sustainable Railcar Conversions
Select expense information:
Depreciation (3)		4.7			7.3
Reduced Depreciation [Member]
Select expense information:
Depreciation (3)					7
Operating Segments [Member]
Revenues:
Revenues		503.5		459.4	1,273.8		1,583.8
Operating profit (2):
Total operating profit		120.9		100.2	302.8		325.6
Railcar Leasing and Management Services Group [Member]
Operating profit (2):
Total operating profit					268.7		265.5
Railcar Leasing and Management Services Group [Member] | Operating Segments [Member]
Revenues:
Revenues		$ 185.5		183.9	$ 554.1		613
Revenues, Percent Change		0.90%			(9.60%)
Operating profit (2):
Total operating profit		$ 109.3		$ 89.7	$ 268.7		$ 265.5
Operating Income (Loss), Percent Change		21.90%			1.20%
Operating Profit Margin		58.90%		48.80%	48.50%		43.30%
Select expense information:
Depreciation (3)	[1]	$ 58.7	[2]	$ 51.5	$ 170.5	[2]	$ 159.1
Depreciation, Depletion, and Amortization, Percent Change	[1]	14.00%			7.20%
Maintenance and compliance	[1]	$ 22.8		18.5	$ 73.7		67.4
Maintenance Costs, Percent Change	[1]	23.20%			9.30%
Operating lease expense	[1]	$ 1.9		2.1	$ 5.3		8.1
Operating Leases, Rent Expense, Percent Change	[1]	(9.50%)			(34.60%)
Selling, engineering, and administrative expenses	[1]	$ 11.6		11.7	$ 36.1		39
Selling, Engineering, and Administrative Expense, Percent Change	[1]	(0.90%)			(7.40%)
Interest (4)		$ 39.9	[3]	47	$ 142.6	[3]	149.2
Interest Expense, Percent Change	[3]	(15.10%)			(4.40%)
Railcar Leasing and Management Services Group [Member] | Operating Segments [Member] | Leasing and Management [Member]
Revenues:
Revenues		$ 185.5		183.9	$ 554.1		558.6
Revenues, Percent Change		0.90%			(0.80%)
Operating profit (2):
Total operating profit		$ 76.4		$ 86.8	$ 223		$ 247.8
Operating Income (Loss), Percent Change		(12.00%)			(10.00%)
Operating Profit Margin		41.20%		47.20%	40.20%		44.40%
Railcar Leasing and Management Services Group [Member] | Operating Segments [Member] | Railcar Owned One Year or Less [Member]
Revenues:
Revenues	[4]	$ 0		$ 0	$ 0		$ 54.4
Revenues, Percent Change	[4]				(100.00%)
Railcar Leasing and Management Services Group [Member] | Operating Segments [Member] | Sales of Leased Railcars [Domain]
Operating profit (2):
Total operating profit	[4]	$ 32.9		$ 2.9	$ 45.7		$ 17.7
Operating Income (Loss), Percent Change	[4]				158.20%
Operating Profit Margin		10.20%		44.60%	11.10%		9.20%
[1]	2) Operating profit includes: depreciation; maintenance and compliance; rent; and selling, engineering, and administrative expenses. Amortization of deferred profit on railcars sold from the Rail Products Group to the Leasing Group is included in the operating profit of the Leasing Group, resulting in the recognition of depreciation expense based on our original manufacturing cost of the railcars. Interest expense is not a component of operating profit and includes the effect of hedges.
[2]	(3) Depreciation expense increased $4.7 million and $7.3 million for the three and nine months ended September 30, 2021, respectively, as a result of the disposal of certain railcar components associated with our sustainable railcar conversion program. Additionally, depreciation expense related to our small cube covered hopper railcars decreased by approximately $7.0 million for the nine months ended September 30, 2021 relative to the nine months ended September 30, 2020 as a result of the impairment charge recorded in the second quarter of 2020 related to these railcars.
[3]	Interest expense for the nine months ended September 30, 2021 includes $11.7 million of loss on extinguishment of debt associated with the refinancing of our partially-owned subsidiaries' debt. See Note 7 for more information. Interest expense for the nine months ended September 30, 2020 includes $5.0 million of loss on extinguishment of debt associated with the early redemption of debt.
[4]	(1) Beginning in the fourth quarter of 2020, we made a prospective change in the presentation of sales of railcars from the lease fleet. Therefore, all railcar sales for the three and nine months ended September 30, 2021 are presented as a net gain or loss from the disposal of a long-term asset regardless of the age of railcar that is sold. See Note 1 for more information.

Railcar Leasing and Managemen_5

Railcar Leasing and Management Services Group - Schedule of proceeds from leased railcars (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Property Subject to or Available for Operating Lease [Line Items]
Lease portfolio sales				$ 404.5
Operating profit on lease portfolio sales		$ 92.2	$ 72.9	219.8	$ (161.4)
Railcar Leasing and Management Services Group [Member]
Property Subject to or Available for Operating Lease [Line Items]
Operating profit on lease portfolio sales				268.7	265.5
Operating Segments [Member]
Property Subject to or Available for Operating Lease [Line Items]
Operating profit on lease portfolio sales		120.9	100.2	302.8	325.6
Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Property Subject to or Available for Operating Lease [Line Items]
Operating profit on lease portfolio sales		$ 109.3	$ 89.7	$ 268.7	$ 265.5
Operating Profit Margin		58.90%	48.80%	48.50%	43.30%
Operating Segments [Member] | Sales of Leased Railcars [Domain] | Railcar Leasing and Management Services Group [Member]
Property Subject to or Available for Operating Lease [Line Items]
Lease portfolio sales		$ 322.1	$ 6.5	$ 410.9	$ 193.1
Operating profit on lease portfolio sales	[1]	$ 32.9	$ 2.9	$ 45.7	$ 17.7
Operating Profit Margin		10.20%	44.60%	11.10%	9.20%
[1]	(1) Beginning in the fourth quarter of 2020, we made a prospective change in the presentation of sales of railcars from the lease fleet. Therefore, all railcar sales for the three and nine months ended September 30, 2021 are presented as a net gain or loss from the disposal of a long-term asset regardless of the age of railcar that is sold. See Note 1 for more information.

Railcar Leasing and Managemen_6

Railcar Leasing and Management Services Group - Future contractual minimum rental revenues on leases (Details) - Railcar Leasing and Management Services Group [Member] $ in Millions	Sep. 30, 2021USD ($)
Future contractual minimum rental revenue
Remaining three months of 2021	$ 146.7	[1]
2022	497.6	[1]
2023	374.8	[1]
2024	280.2	[1]
2025	198	[1]
Thereafter	344.4	[1]
Total	1,841.7	[1]
Railroad Transportation Equipment
Future contractual minimum rental revenue
Remaining three months of 2021	145.1
2022	492.6
2023	371.8
2024	278.1
2025	196.8
Thereafter	343.7
Total	$ 1,828.1
[1]	Total contractual minimum rental revenues on operating leases relates to our wholly-owned and partially-owned subsidiaries and sub-lease rental revenues associated with the Leasing Group's operating lease obligations.

Railcar Leasing and Managemen_7

Railcar Leasing and Management Services Group - Future operating lease obligations and future contractual minimum rental revenues (Details) $ in Millions	Sep. 30, 2021USD ($)
Future operating lease obligations
Remaining three months of 2021	$ 4
2022	19.3
2023	17.5
2024	12.9
2025	10.3
Thereafter	72.9
Lessee, Operating Lease, Liability, to be Paid, Total	136.9
Railcar Leasing and Management Services Group [Member]
Future operating lease obligations
Remaining three months of 2021	2.9
2022	11.1
2023	9.3
2024	5.9
2025	4
Thereafter	8.1
Lessee, Operating Lease, Liability, to be Paid, Total	41.3
Future contractual minimum rental revenues
Remaining three months of 2021	146.7	[1]
2022	497.6	[1]
2023	374.8	[1]
2024	280.2	[1]
2025	198	[1]
Thereafter	344.4	[1]
Total	1,841.7	[1]
Railcar Leasing and Management Services Group [Member] | Building [Member]
Future operating lease obligations
Lessee, Operating Lease, Liability, to be Paid, Total	1.7
Railcar Leasing and Management Services Group [Member] | Railroad Transportation Equipment
Future operating lease obligations
Remaining three months of 2021	2.8
2022	10.8
2023	9
2024	5.5
2025	3.7
Thereafter	7.8
Lessee, Operating Lease, Liability, to be Paid, Total	39.6
Railcar Leasing and Management Services Group [Member] | Property Lease Guarantee [Member]
Future contractual minimum rental revenues
Guarantor Obligations, Maximum Exposure, Undiscounted	1.8
Railcar Leasing and Management Services Group [Member] | Operating leases
Future contractual minimum rental revenues
Remaining three months of 2021	1.6
2022	5
2023	3
2024	2.1
2025	1.2
Thereafter	0.7
Total	$ 13.6
[1]	Total contractual minimum rental revenues on operating leases relates to our wholly-owned and partially-owned subsidiaries and sub-lease rental revenues associated with the Leasing Group's operating lease obligations.

Railcar Leasing and Managemen_8

Railcar Leasing and Management Services Group - Narrative (Details) - Railcar Leasing and Management Services Group [Member] $ in Millions	Sep. 30, 2021USD ($)
Minimum
Segment Reporting Information [Line Items]
Lessor, Operating Lease, Term of Contract	1 year
Maximum
Segment Reporting Information [Line Items]
Lessor, Operating Lease, Term of Contract	10 years
Wholly-owned subsidiaries
Segment Reporting Information [Line Items]
Net book value of unpledged equipment	$ 825.8
Wholly-owned subsidiaries | Secured Debt [Member]
Segment Reporting Information [Line Items]
Debt Instrument, Collateral Amount	4,761.9
TRIP Holdings [Member] | Secured Debt [Member]
Segment Reporting Information [Line Items]
Debt Instrument, Collateral Amount	1,130.2
RIV 2013 Holdings | Secured Debt [Member] | TRL 2012 Secured Railcar Equipment Notes - RIV 2013 [Member]
Segment Reporting Information [Line Items]
Debt Instrument, Collateral Amount	$ 464.5

Property, Plant, and Equipmen_2

Property, Plant, and Equipment - Components of property, plant, and equipment (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment, Net [Abstract]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,940.9 and $1,931.6	$ 9,097.7	$ 9,193
Less: accumulated depreciation	(2,297.6)	(2,189.6)
Property, Plant and Equipment, Net	6,800.1	7,003.4
Intersegment Eliminations [Member]
Property, Plant and Equipment, Net [Abstract]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,940.9 and $1,931.6	(1,044.7)	(1,064.7)
NegativeAccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	262.1	244.4
Property, Plant and Equipment, Net	(782.6)	(820.3)
Railcar Leasing and Management Services Group [Member] | Operating Segments [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Net	7,198.1	7,422.2
Manufacturing and Corporate [Member]
Property, Plant and Equipment, Net [Abstract]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,940.9 and $1,931.6	946.1	979.4
Less: accumulated depreciation	(561.5)	(577.9)
Property, Plant and Equipment, Net	384.6	401.5
Manufacturing and Corporate [Member] | Land
Property, Plant and Equipment, Net [Abstract]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,940.9 and $1,931.6	22	23.2
Manufacturing and Corporate [Member] | Buildings and improvements
Property, Plant and Equipment, Net [Abstract]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,940.9 and $1,931.6	423.8	428.6
Manufacturing and Corporate [Member] | Machinery and other
Property, Plant and Equipment, Net [Abstract]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,940.9 and $1,931.6	481.6	485.1
Manufacturing and Corporate [Member] | Construction in progress
Property, Plant and Equipment, Net [Abstract]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,940.9 and $1,931.6	18.7	42.5
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group [Member] | Operating Segments [Member]
Property, Plant and Equipment, Net [Abstract]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,940.9 and $1,931.6	6,937.4	7,030.1
Less: accumulated depreciation	(1,334)	(1,234.2)
Property, Plant and Equipment, Net	5,603.4	5,795.9
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group [Member] | Machinery and other | Operating Segments [Member]
Property, Plant and Equipment, Net [Abstract]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,940.9 and $1,931.6	20.1	19.5
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group [Member] | Equipment on lease | Operating Segments [Member]
Property, Plant and Equipment, Net [Abstract]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,940.9 and $1,931.6	6,917.3	7,010.6
Partially-owned subsidiaries
Property, Plant and Equipment, Net [Abstract]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,940.9 and $1,931.6	1,940.9	1,931.6
Less: accumulated depreciation	(561.4)	(525.7)
Partially-owned subsidiaries | Railcar Leasing and Management Services Group [Member] | Operating Segments [Member]
Property, Plant and Equipment, Net [Abstract]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,940.9 and $1,931.6	2,258.9	2,248.2
Less: accumulated depreciation	(664.2)	(621.9)
Property, Plant and Equipment, Net	$ 1,594.7	$ 1,626.3

Debt - Components of debt (Deta

Debt - Components of debt (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total recourse debt	$ 398.5	$ 448.2
Non-Recourse Debt	4,778	4,568.8
Total debt	5,176.5	5,017
Level 1
Debt Instrument [Line Items]
Long-term Debt, Fair Value	1,612.2	1,372.1
Level 2
Debt Instrument [Line Items]
Long-term Debt, Fair Value	425.3	420.3
Level 3
Debt Instrument [Line Items]
Long-term Debt, Fair Value	3,295.6	3,462.4
Fair Value, Inputs, Level 1, 2 and 3
Debt Instrument [Line Items]
Long-term Debt, Fair Value	5,333.1	5,254.8
Corporate Segment [Member]
Debt Instrument [Line Items]
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs	399.8	449.8
Less: unamortized debt issuance costs	1.3	1.6
Senior Notes [Member] | Corporate Segment [Member]
Debt Instrument [Line Items]
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs	399.8	399.8
Debt Instrument, Unamortized Discount	0.2	0.2
TRIP Railcar Co Term Loan | Line of Credit [Member] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
TILC warehouse facility	327	0
Wholly Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Non-Recourse Debt	3,553.5	3,340.5
Wholly Owned Subsidiaries [Member] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Less: unamortized debt issuance costs	25	24
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	3,578.5	3,364.5
Non-Recourse Debt	3,553.5	3,340.5
Wholly Owned Subsidiaries [Member] | Secured Debt [Member] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	0.5	0.6
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	2,293.3	2,042.4
Wholly Owned Subsidiaries [Member] | 2017 Secured Railcar Equipment Notes [Member] [Domain] | Promissory Notes [Member] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	8.4	10.1
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	770.8	802.7
Partially-Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Non-Recourse Debt	1,224.5	1,228.3
Partially-Owned Subsidiaries [Member] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Less: unamortized debt issuance costs	11.7	9.2
Non-Recourse Debt	1,224.5	1,228.3
Partially-Owned Subsidiaries [Member] | Secured Debt [Member] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	0.3	0
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	909.2	1,237.5
Revolving Credit Facility [Member] | Line of Credit [Member] | Corporate Segment [Member]
Debt Instrument [Line Items]
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs	0	50
Revolving Credit Facility [Member] | TILC [Member] | TILC Warehouse Facility [Member] | Line of Credit [Member] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
TILC warehouse facility	$ 514.4	$ 519.4

Debt - Narrative (Details)

Debt - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 250		$ 250
Gain (Loss) on Extinguishment of Debt	$ 0	$ 0	$ (11.7)	$ (5)
Corporate Segment [Member] | Senior Notes [Member] | 4.55% Senior Notes Due October 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.55%		4.55%
Corporate Segment [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 450		$ 450
Proceeds from Lines of Credit			470
Repayments of Lines of Credit			520
Line of Credit Facility, Current Borrowing Capacity	$ 421.7		$ 421.7
Debt Instrument, Interest Rate, Effective Percentage	1.75%		1.75%
Line of Credit Facility, Interest Rate at Period End	0.25%		0.25%
Corporate Segment [Member] | Letter of Credit [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	$ 28.3		$ 28.3
TILC [Member] | Railcar Leasing and Management Services Group [Member] | Secured Debt [Member] | TRL-2021 Series 2021-1 Class A Green Secured Railcar Equipment Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.26%		2.26%
Debt Instrument, Face Amount	$ 305.2		$ 305.2
TILC [Member] | Railcar Leasing and Management Services Group [Member] | Secured Debt [Member] | TRL-2021 Series 2021-1 Class B Green Secured Railcar Equipment Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.08%		3.08%
Debt Instrument, Face Amount	$ 19.8		$ 19.8
TILC [Member] | Railcar Leasing and Management Services Group [Member] | Secured Debt [Member] | TRL-2021 Series 2021-1Green Secured Railcar Equipment Notes
Debt Instrument [Line Items]
Payments of Debt Issuance Costs			3.3
Proceeds from Issuance of Debt			$ 214.4
TILC [Member] | Railcar Leasing and Management Services Group [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | TILC Warehouse Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	1.94%		1.94%
Debt Instrument, Face Amount	$ 1,000		$ 1,000		$ 750
Borrowings on Warehouse Loan Facility			374.7
Repayments on Warehouse Loan Facility			379.7
Line of Credit Facility, Remaining Borrowing Capacity Exclusive of Current Restrictions	$ 485.6		485.6
TRIP Holdings [Member] | Railcar Leasing and Management Services Group [Member] | Secured Debt [Member] | TRIP Master Funding Secured Railcar Equipment Notes [Member]
Debt Instrument [Line Items]
Payments of Debt Issuance Costs			5.6
Extinguishment of Debt, Amount			869.1
Gain (Loss) on Extinguishment of Debt			8.7
Write off of Deferred Debt Issuance Cost			5.4
Payment for Debt Extinguishment or Debt Prepayment Cost			$ 3.3
Debt, Weighted Average Interest Rate	5.16%		5.16%
TRIP Holdings [Member] | Railcar Leasing and Management Services Group [Member] | Secured Debt [Member] | Triumph Rail Class A Secured Railcar Equipment Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.15%		2.15%
Debt Instrument, Face Amount	$ 535		$ 535
TRIP Holdings [Member] | Railcar Leasing and Management Services Group [Member] | Secured Debt [Member] | Triumph Rail Class B Secured Railcar Equipment Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.08%		3.08%
Debt Instrument, Face Amount	$ 25.4		$ 25.4
TRIP Holdings [Member] | Railcar Leasing and Management Services Group [Member] | Secured Debt [Member] | TRIP Railcar Co Term Loan
Debt Instrument [Line Items]
Proceeds from Lines of Credit			$ 329.6
Debt Instrument, Interest Rate, Effective Percentage	1.94%		1.94%
Payments of Debt Issuance Costs			$ 2.9
Debt Instrument, Interest Rate, Increase (Decrease)			1.85%
RIV 2013 Holdings | Railcar Leasing and Management Services Group [Member] | Secured Debt [Member] | TRP-2021 Class A Secured Railcar Equipment Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.07%		2.07%
Debt Instrument, Face Amount	$ 334		$ 334
RIV 2013 Holdings | Railcar Leasing and Management Services Group [Member] | Secured Debt [Member] | TRP 2021 Class B Secured Railcar Equipment Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.06%		3.06%
Debt Instrument, Face Amount	$ 21		$ 21
RIV 2013 Holdings | Railcar Leasing and Management Services Group [Member] | Secured Debt [Member] | TRL 2012 Secured Railcar Equipment Notes - RIV 2013 [Member]
Debt Instrument [Line Items]
Payments of Debt Issuance Costs			3.7
Extinguishment of Debt, Amount			348
Write off of Deferred Debt Issuance Cost			$ 3
Debt, Weighted Average Interest Rate	3.59%		3.59%
Minimum | Corporate Segment [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	0.30%		0.30%
Line of Credit Facility, Interest Rate at Period End	0.175%		0.175%
Maximum | Corporate Segment [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End	0.40%		0.40%

Income Taxes Narrative (Details

Income Taxes Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	(23.90%)	34.90%	(27.80%)	69.50%
Effective Tax Rate without CARES Act, Percent		(10.20%)		15.80%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%	21.00%
Income Taxes Paid, Net			$ 246.9
Income tax receivable	$ 191.9		$ 191.9		$ 445.8

Employee Retirement Plans - Com

Employee Retirement Plans - Components of net retirement cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest	0.1	3.8	0.3	11.2
Expected return on plan assets	0	(5.3)	0	(15.7)
Amortization of actuarial loss	0	1.5	0.2	4.5
Amortization of prior service cost	0	0.3	0	0.9
Net periodic benefit cost	0.1	0.3	0.5	0.9
Profit sharing	3.1	1.9	8.3	6.5
Net expense	$ 3.2	$ 2.2	$ 8.8	$ 7.4

Employee Retirement Plans - Nar

Employee Retirement Plans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2021
Retirement Benefits [Abstract]
Defined Benefit Plan, Benefit Obligation, Payment for Settlement		$ 151.5
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0.7		$ 10.9
Defined Benefit Plan, Plan Assets, Administration Expense	0		2.2
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ 10.5		$ 10.5

Restructuring Activities (Detai

Restructuring Activities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring activities, net	$ 0.1	$ (4.7)	$ 1.1	$ (10.5)
Gain (Loss) on Disposition of Assets	0.2		1.6	3.5
Employee severance costs	0.1	3.4	0.5	7.5
Non-cash impact of restructuring activities		0.7		5.9
Restructuring Reserve	0.3		0.3		$ 1.4
Charges and adjustments			0.5
Payments			(1.6)
Loss on Contract Termination		0.6		0.6
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0.3		0.3
Railcar Leasing and Management Services Group [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring activities, net	0	(1.4)	0	(1.4)
Gain (Loss) on Disposition of Assets	0		0	0
Employee severance costs	0	1.4	0	1.4
Non-cash impact of restructuring activities		0		0
Loss on Contract Termination		0		0
Rail Products Group [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring activities, net	(0.1)	(2.2)	(0.4)	(4.8)
Gain (Loss) on Disposition of Assets	0		0	0
Employee severance costs	0.1	1.3	0.4	3.9
Non-cash impact of restructuring activities		0.7		0.7
Loss on Contract Termination		0.2		0.2
Other Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring activities, net	0.2	(0.1)	1.6	3.3
Gain (Loss) on Disposition of Assets	0.2		1.6	3.5
Employee severance costs	0	0.1	0	0.2
Non-cash impact of restructuring activities		0		0
Loss on Contract Termination		0		0
Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring activities, net	0	(1)	(0.1)	(7.6)
Gain (Loss) on Disposition of Assets	0		0	0
Employee severance costs	$ 0	0.6	$ 0.1	2
Non-cash impact of restructuring activities		0		5.2
Loss on Contract Termination		$ 0.4		$ 0.4

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss - Changes in accumulated other comprehensive loss (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (23.9)						$ (23.9)		$ (30.9)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax, before reclassifications							5
Amounts reclassified from AOCL, net of tax benefit of $—, $0.6, $0.1, and $0.7							3
Reclassification from AOCI, Current Period, Tax							0.7
Less: noncontrolling interest	(1)	$ (1.6)	$ (5.4)	$ (8.1)	$ (4.6)	$ 23.2	(8)	$ 10.5
Other comprehensive income							7
Currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1.3)						(1.3)		(1.3)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax, before reclassifications							0
Amounts reclassified from AOCL, net of tax benefit of $—, $0.6, $0.1, and $0.7							0
Reclassification from AOCI, Current Period, Tax							0
Other comprehensive income							0
Unrealized gains/(losses) on derivative financial instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(18.7)						(18.7)		(25.6)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax, before reclassifications							5
Amounts reclassified from AOCL, net of tax benefit of $—, $0.6, $0.1, and $0.7							2.9
Reclassification from AOCI, Current Period, Tax							0.6
Other comprehensive income							6.9
Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest [Member]
Changes in accumulated other comprehensive loss
Less: noncontrolling interest							(1)
Net actuarial gains/(losses) and prior service costs of defined benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3.9)						(3.9)		(4)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax, before reclassifications							0
Amounts reclassified from AOCL, net of tax benefit of $—, $0.6, $0.1, and $0.7							0.1
Reclassification from AOCI, Current Period, Tax							0.1
Other comprehensive income							0.1
Noncontrolling Interest [Member]
Changes in accumulated other comprehensive loss
Less: noncontrolling interest	(0.3)	(0.4)	(0.3)	(0.3)	(0.3)	(0.3)	(1)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(23.9)						$ (23.9)		$ (30.9)
Changes in accumulated other comprehensive loss
Less: noncontrolling interest	$ (0.7)	$ (1.2)	$ (5.1)	$ (7.8)	$ (4.3)	$ 23.5

Common Stock and Stock-Based _4

Common Stock and Stock-Based Compensation Stockholders Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 09, 2021	Apr. 29, 2021	Oct. 23, 2020
Share Repurchases [Line Items]
Treasury Stock, Value, Acquired, Cost Method	$ 77.1	$ 290.8	$ 36.8		$ 89.9	$ 35.4
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 0						$ 0
Share-based Payment Arrangement, Cash Used to Settle Award					$ 4.9
2020-2021 Share Repurchase Program
Share Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount											$ 250
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 77.1	$ 145.4	$ 182.2
Total Shares Repurchased Under Program	9,522,882						9,522,882
Total Shares Repurchased Under Program, Value	$ 250						$ 250
Special Share Repurchase Program
Share Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount										$ 222.5
Stock Repurchase Program, Number of Shares Authorized to be Repurchased										8,100,000
Treasury Stock Acquired, Average Cost Per Share	$ 27.47
Treasury Stock Acquired, Per Share Discount										3.50%
2021-2022 Share Repurchase Program
Share Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount									$ 250
Treasury Stock [Member]
Share Repurchases [Line Items]
Treasury Stock, Shares, Acquired	2,815,307	10,500,000	1,300,000		4,500,000	1,900,000	14,600,000	6,300,000
Treasury Stock, Value, Acquired, Cost Method	$ 77.1	$ 290.8	$ 36.8		$ 89.9	$ 35.4	$ 404.7	$ 125.3
Treasury Stock [Member] | 2020-2021 Share Repurchase Program
Share Repurchases [Line Items]
Treasury Stock, Shares, Acquired		2,440,793	1,291,860	2,974,922
Treasury Stock, Value, Acquired, Cost Method	$ 77.1	$ 68.3	$ 36.8	$ 67.8

Common Stock and Stock-Based _5

Common Stock and Stock-Based Compensation Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 6.5	$ 4.4	$ 5.4	$ 4.8	$ 7.6	$ 7.3	$ 16.3	$ 19.7
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period							10 years
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Granted							617,165
Weighted Average Grant-Date Fair Value per Award							$ 28.40
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							1 year
Number of Shares Granted							22,734
Weighted Average Grant-Date Fair Value per Award							$ 28.48
Performance units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							3 years
Number of Shares Granted							240,931
Weighted Average Grant-Date Fair Value per Award							$ 30.85
Minimum | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							3 years
Maximum | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							4 years

Earnings Per Common Share - EPS

Earnings Per Common Share - EPS calculation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Income (loss) from continuing operations	$ 36.3	$ 25.9	$ 42.8	$ (99.4)
Less: Net (income) loss attributable to noncontrolling interest	(3.9)	(0.8)	6	79.5
Unvested restricted share participation – continuing operations	0	(0.2)	0	0
Net income (loss) from continuing operations attributable to Trinity Industries, Inc.	32.4	24.9	48.8	(19.9)
Loss from discontinued operations, net of provision (benefit) for income taxes of $0.4, $—, $0.8, and $(0.1)	(0.4)	0	(0.8)	(0.2)
Unvested restricted share participation – discontinued operations	0	0	0	0
Net loss from discontinued operations attributable to Trinity Industries, Inc.	(0.4)	0	(0.8)	(0.2)
Net income (loss) attributable to Trinity Industries, Inc., including the effect of unvested restricted share participation	$ 32	$ 24.9	$ 48	$ (20.1)
Basic weighted average shares outstanding	97.7	116.4	103.4	117.2
Effect of dilutive securities	1.8	0.6	2.3	0
Diluted weighted average shares outstanding	99.5	117	105.7	117.2
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.33	$ 0.21	$ 0.47	$ (0.17)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0	0	(0.01)	0
Basic net income (loss) attributable to Trinity Industries, Inc.	0.33	0.21	0.46	(0.17)
Income (Loss) from Continuing Operations, Per Diluted Share	0.33	0.21	0.46	(0.17)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0	0	(0.01)	0
Diluted net income (loss) attributable to Trinity Industries, Inc.	$ 0.33	$ 0.21	$ 0.45	$ (0.17)
Restricted Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.1	0.3	0.1	0
Stock options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0.3	0	0

Contingencies - Narrative (Deta

Contingencies - Narrative (Details) - USD ($) $ in Millions	Jun. 09, 2015	Sep. 30, 2021	Mar. 31, 2021
Loss Contingencies [Line Items]
Loss Contingency, Receivable		$ 6.4
Former Gain Contingency, Recognized in Current Period		4.7
Property, Plant and Equipment, Additions		2.6
Accrued Liabilities [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual		11.7
Highway Products Litigation | False Claims Act, USA
Loss Contingencies [Line Items]
Loss Contingency, Judgment Entered, Value	$ 682.4
Highway Products Litigation | State, County, and Municipal Actions [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual		0
Environmental and Workplace Matters [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual		1.4
Loss from Catastrophes
Loss Contingencies [Line Items]
Loss Contingency, Receivable			$ 1.2
Loss Contingency, Receivable, Proceeds		14.6
Collectibility of Receivables
Loss Contingencies [Line Items]
Loss Contingency, Receivable, Proceeds		1.2
Damage from Fire, Explosion or Other Hazard
Loss Contingencies [Line Items]
Loss Contingency, Receivable, Proceeds		8.1
Minimum
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss		11.2
Maximum
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss		$ 18.4