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Earnings Per Common Share
3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Earnings per Common Share Earnings Per Common Share
Basic earnings per common share is computed by dividing net income remaining after allocation to unvested restricted shares, which includes unvested restricted shares of Arcosa stock held by employees of the Former Parent, by the weighted average number of basic common shares outstanding for the period. Except when the effect would be antidilutive, the calculation of diluted earnings per common share includes the weighted average net impact of nonparticipating unvested restricted shares. Total weighted average restricted shares were 1.5 million shares and 1.7 million shares for the three months ended March 31, 2020 and 2019, respectively.
The computation of basic and diluted earnings per share follows.  
 Three Months Ended
March 31, 2020
Three Months Ended
March 31, 2019
 Income
(Loss)
Average
Shares
EPSIncome
(Loss)
Average
Shares
EPS
(in millions, except per share amounts)
Net income$31.6  $27.7  
Unvested restricted share participation(0.3) (0.3) 
Net income per common share – basic
31.3  47.8  $0.65  27.4  47.9  $0.57  
Effect of dilutive securities:
Nonparticipating unvested restricted shares
—  0.6  —  0.6  
Net income per common share – diluted
$31.3  48.4  $0.65  $27.4  48.5  $0.56