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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Stock-based compensation expense
The following table summarizes our stock-based compensation expense for the three months ended March 31, 2022 and 2021.
Three Months Ended
March 31,
(in millions)20222021
Stock-based compensation expenses (restricted share units (“RSUs”) and performance-based RSUs (“PRSUs”)), before income taxes$7.9 $6.0 
Tax benefit(0.4)(0.3)
Stock-based compensation expense, net of tax$7.5 $5.7 
Activity of RSUs and PRSUs Issued to Our Employees
The following table summarizes activity for the three months ended March 31, 2022, of RSUs and PRSUs issued to our employees.
ActivityWeighted Average Per Share Grant Date Fair Market Value
Non-vested as of December 31, 20212,447,246 $23.18 
Granted:
RSUs908,598 25.24 
PRSUs482,618 24.42 
Vested:
RSUs(710,912)24.13 
PRSUs(293,773)21.65 
Forfeitures:
RSUs(5,925)23.62 
PRSUs(3,061)26.60 
Non-vested as of March 31, 20222,824,791 23.89