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Note 13. Common Stock and Stock-based Compensation Common Stock and Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
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, 2018
5,633,434

 
$
21.06

Granted
978,056

 
22.20

Vested
(1,270,190
)
 
21.90

Forfeited
(285,839
)
 
22.49

Restricted share awards outstanding at December 31, 2019 (1)
5,055,461

 
$
20.99

(1) The balance of restricted share awards outstanding at December 31, 2019 includes approximately 0.8 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, 2018
324,368

 
$
32.37

Granted
476,394

 
22.22

Vested
—

 
—

Forfeited
—

 
—

Performance units outstanding at December 31, 2019
800,762

 
$
26.33