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Note 13. Common Stock and Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
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, 2020
300,000 $5.26 
Granted— $— 
Exercised— $— 
Cancelled— $— 
Options outstanding at December 31, 2021
300,000 $5.26 8.1$2.6 
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
Number of Restricted Share Awards
Weighted Average Grant-Date
Fair Value per Award
Restricted share awards outstanding at December 31, 2020
3,798,431 $20.06 
Granted663,216 $28.41 
Vested(1,307,435)$19.27 
Forfeited(464,647)$22.45 
Restricted share awards outstanding at December 31, 2021 (1)
2,689,565 $22.09 
(1) The balance of restricted share awards outstanding at December 31, 2021 includes approximately 0.5 million restricted shares for Arcosa employees that were converted under the shareholder method at the time of the Arcosa spin-off. These restricted shares 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
Share-based Payment Arrangement, Performance Shares, Activity [Table Text Block]
Number of Performance Units
Weighted Average Grant-Date
Fair Value per Award
Performance units outstanding at December 31, 2020
1,235,172 $24.17 
Granted240,931 $30.85 
Vested(221,513)$32.37 
Forfeited(99,309)$32.37 
Performance units outstanding at December 31, 2021
1,155,281 $23.28