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Note 13. Common Stock and Stock-based Compensation | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Share-based Payment Arrangement [Text Block] | Common Stock and Stock-Based Compensation Stockholders' Equity New Share Repurchase Authorization In December 2022, our Board of Directors authorized a new share repurchase program effective December 9, 2022 with no expiration. 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 the new share repurchase program during the year ended December 31, 2022. Previous Share Repurchase Authorization In September 2021, our Board of Directors authorized a share repurchase program effective September 9, 2021 through December 31, 2022. The share repurchase program authorized the Company to repurchase up to $250.0 million of its common stock. In December 2021, we entered into an accelerated share repurchase agreement (the "ASR") to repurchase $125.0 million of our common stock. Approximately 3.3 million shares totaling $100.0 million that were repurchased as part of the ASR on December 31, 2021 were delivered to the Company in January 2022 in accordance with normal settlement practices, representing approximately 80% of the total notional value of the ASR. The ASR was completed in April 2022. Our Board of Directors terminated this share repurchase program effective December 8, 2022, and the remaining authorization of $21.3 million under this program expired unused. Share repurchase activity under this program was as follows:
| Shares Repurchased |  | Remaining Authorization to Repurchase |
Period | Number of shares |  | Cost (in millions) |  | Cost (in millions) |
September 9, 2021 Authorization |  |  |  |  | $ | 250.0 |  |
September 9, 2021 through September 30, 2021 | — |  |  | $ | — |  |  | $ | 250.0 |  |
October 1, 2021 through December 31, 2021 | 5,155,491 |  |  | 151.9 |  |  | $ | 98.1 |  |
January 1, 2022 through March 31, 2022 | — |  |  | — |  |  | $ | 98.1 |  |
April 1, 2022 through June 30, 2022 | 1,760,462 |  |  | 50.3 |  |  | $ | 47.8 |  | (1) |
July 1, 2022 through September 30, 2022 | 610,000 |  |  | 14.1 |  |  | $ | 33.7 |  |
October 1, 2022 through December 31, 2022 | 427,383 |  |  | 12.4 |  |  | $ | 21.3 |  |
Total | 7,953,336 |  |  | $ | 228.7 |  |  |  |
(1) Share repurchases during the second quarter of 2022 included 760,602 shares at a cost of $25.0 million representing the final settlement of the ASR, which was funded in December 2021 but a portion of which remained outstanding as of December 31, 2021. During the years ended December 31, 2022, 2021, and 2020, share repurchases totaled 2.8 million, 28.5 million, and 9.3 million shares, respectively, at a cost of approximatel y $76.8 million, $806.6 million, and $193.1 million, respectively. Share repurchases during the year ended December 31, 2021 included 16.9 million shares, at a cost of approximately $472.5 million, from privately negotiated transactions with ValueAct Capital Master Fund, L.P ("ValueAct"). The repurchases from ValueAct were approved by our Board of Directors separately from, and did not reduce the authorized amount remaining under, any of our share repurchase programs.
Shareholders' Equity and Share-based Payments [Text Block] | Stock-Based Compensation Stock Award Plans Our 2004 Fourth Amended and Restated Trinity Industries, Inc. Stock Option and Incentive Plan (the "Plan”) provides for awarding 20,150,000 (adjusted for stock splits) shares of common stock plus (i) shares covered by forfeited, expired, and canceled options granted under prior plans; and (ii) shares tendered as full or partial payment for the purchase price of an award or to satisfy tax withholding obligations. At December 31, 2022, a total of 1,772,345 s hares were available for issuance. The Plan provides for the granting of nonqualified and incentive stock options having maximum ten-year terms to purchase common stock at its market value on the award date; stock appreciation rights based on common stock fair market values with settlement in common stock or cash; restricted stock awards; restricted stock units; and performance awards with settlement in common stock or cash on achievement of specific business objectives. Our stock options have contractual terms of ten years and become exercisable over a three-year period. Stock-Based Compensation Expense The cost of employee services received in exchange for awards of equity instruments is referred to as stock-based compensation and is recognized over the applicable vesting periods based on the grant date fair-value of those awards. Stock-based compensation expense totale d $22.5 million, $20.7 million, and $25.4 million for the years ended December 31, 2022, 2021, and 2020, respectively. The income tax benefit related to stock-based compensation expense was $2.6 million, $10.7 million, and $0.4 million for the years ended December 31, 2022, 2021, and 2020, respectively. Stock Options Expense related to stock options is recognized on a straight-line basis over the vesting period. No options were exercisable at December 31, 2022.
| Number of Shares |  | Weighted Average Grant-Date Fair Value per Award |  | Weighted Average Remaining Contractual Terms (Years) |  | Aggregate Intrinsic Value (in millions)
Options outstanding at December 31, 2021 | 300,000 |  |  | $ | 5.26 |  |  |  |  |
Granted | — |  |  | $ | — |  |  |  |  |
Exercised | — |  |  | $ | — |  |  |  |  |
Cancelled | — |  |  | $ | — |  |  |  |  |
Options outstanding at December 31, 2022 | 300,000 |  |  | $ | 5.26 |  |  | 7.1 |  | $ | 2.4 |
At December 31, 2022, unrecognized compensation expense related to stock options totaled $0.1 million, which will be recognized over a weighted average period of 0.1 years. The weighted average exercise price of stock options outstanding as of December 31, 2022 was $21.61. The fair value of the stock options granted during the year ended December 31, 2020 was estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:
| Year Ended December 31, 2020
Exercise price | $ | 21.61 |
Risk-free interest rate | 1.48 | %
Expected life (in years) | 6.50
Equity volatility | 35.00 | %
Dividend yield | 3.42 | %
Restricted Stock Units Expense related to restricted stock units ("RSUs") issued to eligible employees under the Plan is recognized 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 retire having reached 60 years of age and having provided at least ten years of service to the Company, provided that the awards remain outstanding for a period of at least 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 granted to non-employee directors under the Plan is recognized on a straight-line basis over the vesting period, generally one year. Forfeitures are recognized as a reduction to expense in the period in which they occur.
| Number of Restricted Stock Units |  | Weighted Average Grant-Date Fair Value per Award
Restricted stock units outstanding at December 31, 2021 | 1,924,450 |  |  | $ | 22.00 |
Granted | 651,674 |  |  | $ | 25.65 |
Vested | (646,492) |  |  | $ | 21.94 |
Forfeited | (189,466) |  |  | $ | 23.68 |
Restricted stock units outstanding at December 31, 2022 | 1,740,166 |  |  | $ | 23.20 |
At December 31, 2022, unrecognized compensation expense related to RSUs totaled $19.3 million, which will be recognized over a weighted average period o f 1.7 years. The total grant-date fair value of RSUs vested and released during the years ended December 31, 2022, 2021, and 2020 was $14.2 million, $21.1 million, and $30.8 million, respectively. The weighted average grant-date fair value of RSUs granted during the years ended December 31, 2022, 2021, and 2020 was $25.65, $28.41, and $18.62 per share, respectively. Performance Units Performance units are granted to employees based upon a target level; however, depending upon the achievement of certain specified goals during the performance period, performance units may be adjusted to a level ranging between 0% and 200% of the target level. The performance units vest upon certification by the Human Resources Committee of the Board of Directors of the achievement of the specified performance goals. Expense related to performance units is recognized on a straight-line basis from their award date to the end of the performance period, generally three years. Forfeitures are recognized as a reduction to expense in the period in which they occur.
| Number of Performance Units |  | Weighted Average Grant-Date Fair Value per Award
Performance units outstanding at December 31, 2021 | 1,155,281 |  |  | $ | 23.28 |
Granted | 246,884 |  |  | $ | 29.80 |
Vested | (196,113) |  |  | $ | 24.16 |
Forfeited | (284,661) |  |  | $ | 20.96 |
Performance units outstanding at December 31, 2022 | 921,391 |  |  | $ | 25.56 |
At December 31, 2022, unrecognized compensation expense related to performance units totaled $7.8 million, which will be recognized over a weighted average period o f 1.2 years. The total grant-date fair value of performance units vested and released during the years ended December 31, 2022, 2021, 2020 was $4.7 million, $7.2 million, and $0.1 million, respectively. The weighted average grant-date fair value of performance units granted during the years ended December 31, 2022, 2021, and 2020 was $29.80, $30.85, and $20.31 per share, respectively. Restricted Stock Awards Expense related to restricted stock awards ("RSAs") granted to non-employee directors under the Plan is recognized on a straight-line basis over the vesting period, generally one year. Certain RSAs vest in their entirety upon the employee's retirement from the Company, taking into consideration the employee's age and years of service to the Company, as defined more specifically in our benefit plans. Forfeitures are recognized as a reduction to expense in the period in which they occur.
| Number of Restricted Stock Awards |  | Weighted Average Grant-Date Fair Value per Award
Restricted stock awards outstanding at December 31, 2021 | 769,014 |  |  | $ | 15.67 |
Granted | 26,339 |  |  | $ | 25.43 |
Vested | (92,972) |  |  | $ | 18.74 |
Forfeited | (47,331) |  |  | $ | 17.01 |
Restricted stock awards outstanding at December 31, 2022 (1) | 655,050 |  |  | $ | 15.53 |
(1) The balance of RSAs outstanding at December 31, 2022 includes approximate ly 0.2 million RSAs for Arcosa employees that were converted under the shareholder method at the time of the Arcosa spin-off. These RSAs will be released to Arcosa employees upon vesting, but as of the spin-off date, Trinity no longer records the compensation expense associated with these shares. At December 31, 2022, unrecognized compensation expense related to RSAs totaled $2.7 million, which will be recognized over a weighted average period of 4.3 years. The total grant-date fair value of RSAs vested and released during the years ended December 31, 2022, 2021, and 2020 was $1.7 million, $4.1 million, and $8.3 million, respectively. The weighted average grant-date fair value of RSAs granted during the years ended December 31, 2022, 2021, and 2020 was $25.43, $28.48, and $18.51 per share, respectively.

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- Definition The entire disclosure for shareholders' equity and share-based payment arrangement. Includes, but is not limited to, disclosure of policy and terms of share-based payment arrangement, deferred compensation arrangement, and employee stock purchase plan (ESPP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI https://asc.fasb.org/topic&trid=2208762 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI https://asc.fasb.org/topic&trid=2228938 + Details
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