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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock option activity
 
Number of Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Terms (Years)
 
Aggregate Intrinsic Value
 
 
 
 
 
 
 
(in millions)
Options outstanding at December 31, 2017
34,343

 
$
8.12

 
0.9
 
$1.0
Granted
—

 
—

 
 
 
 
Exercised
(34,343
)
 
8.12

 
 
 
 
Cancelled
—

 
—

 
 
 
 
Options outstanding at December 31, 2018
—

 
$
—

 
0.0
 
$—
Schedule of restricted stock activity
 
Number of Restricted Share Awards
 
Weighted Average Grant-Date
Fair Value per Award
Restricted share awards outstanding at December 31, 2017
6,810,381

 
$
21.91

Granted
1,375,017

 
35.02

Vested
(1,231,614
)
 
24.41

Forfeited
(692,637
)
 
26.33

Cancelled in connection with Arcosa spin-off (1)
(1,639,283
)
 
28.87

Spin-off adjustment for outstanding awards (2)
1,335,938

 
20.48

Restricted share awards outstanding at December 31, 2018 (3)
5,957,802

 
$
21.67


(1) Includes cancellations of restricted share awards attributable to Arcosa employees that were converted to equivalent shares of Arcosa restricted stock in connection with the spin-off and cancellations of certain performance units that were converted to time-based restricted stock units at the spin-off date based on performance attainment as determined by the Human Resources Committee of Trinity's Board of Directors.
(2) Includes additional restricted stock units granted to Trinity employees to maintain the aggregate intrinsic value of awards granted prior to the spin-off and restricted stock units that were converted from performance units to time-based restricted stock units in connection with the spin-off as described above.
(3) The balance of restricted share awards outstanding at December 31, 2018 includes approximately 1.1 million restricted shares for Arcosa employees that were converted under the shareholder method. 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.