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Note 13. Common Stock and Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Stock Options Roll Forward
Number of SharesWeighted Average Grant-Date Fair Value per AwardWeighted Average Remaining Contractual Terms (Years)Aggregate Intrinsic Value
(in millions)
Options outstanding at December 31, 2023
300,000 $5.26 
Granted— $— 
Exercised— $— 
Cancelled— $— 
Options outstanding and exercisable at December 31, 2024
300,000 $5.26 5.1$4.0 
Share-Based Payment Arrangement, Restricted Stock Unit, Activity
Number of Restricted Stock Units
Weighted Average Grant-Date
Fair Value per Award
Aggregate Intrinsic Value
(in millions)
Restricted stock units outstanding at December 31, 2023
1,646,571 $22.60 $43.8 
Granted455,673 $30.70 
Vested(671,979)$23.52 
Forfeited(133,403)$25.21 
Restricted stock units outstanding at December 31, 2024
1,296,862 $24.71 $45.5 
Share-based Payment Arrangement, Performance Shares, Activity [Table Text Block]
Number of Performance Units
Weighted Average Grant-Date
Fair Value per Award
Aggregate Intrinsic Value
(in millions)
Performance units outstanding at December 31, 2023
747,214 $29.41 $19.9 
Granted241,212 $29.54 
Performance adjustment (1)
40,179 $20.27 
Vested (2)
(273,078)$29.39 
Forfeited(31,905)$27.84 
Performance units outstanding at December 31, 2024
723,622 $29.15 $25.4 
(1) For the 2021-2023 performance period, performance adjustment includes 63,954 additional performance units for return on equity, for which actual performance resulted in a payout of 170% of target, and is net of 23,775 performance units for relative total shareholder return, for which actual performance resulted in a payout of 91% of target.
(2) Includes 63,954 performance units for the 2021-2023 performance period for return on equity that were paid out at 170% of target based on actual performance achieved.
Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option
Number of Restricted Stock Awards
Weighted Average Grant-Date
Fair Value per Award
Aggregate Intrinsic Value
(in millions)
Restricted stock awards outstanding at December 31, 2023
552,240 $20.84 $14.7 
Granted15,903 $30.75 
Vested(99,038)$20.11 
Forfeited(50,159)$21.19 
Restricted stock awards outstanding at December 31, 2024 (1)
418,946 $21.34 $14.7 
(1) The balance of RSAs outstanding at December 31, 2024 includes approximately 0.1 million RSAs for Arcosa Inc. ("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.
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award
Additional information related to RSUs is as follows:
Year Ended December 31,
202420232022
(in millions, except weighted average fair value)
Weighted average grant-date fair value of RSUs granted$30.70 $21.63 $25.65 
Total grant-date fair value of RSUs vested and released
$15.8 $14.9 $14.2 
Total intrinsic value of RSUs vested and released $20.6 $13.9 $16.5 
Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award
Additional information related to performance units is as follows:
Year Ended December 31,
202420232022
(in millions, except weighted average fair value)
Weighted average grant-date fair value of performance units granted$29.54 $27.72 $29.80 
Total grant-date fair value of performance units vested and released
$8.0 $10.2 $4.7 
Total intrinsic value of performance units vested and released $8.4 $8.6 $4.8 
Restricted Share Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award
Additional information related to RSAs is as follows:
Year Ended December 31,
202420232022
(in millions, except weighted average fair value)
Weighted average grant-date fair value of RSAs granted$30.75 $21.32 $25.43 
Total grant-date fair value of RSAs vested and released
$2.0 $2.0 $1.7 
Total intrinsic value of RSAs vested and released $3.1 $2.1 $2.4