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Stock-Based Compensation
 3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
The following table summarizes our stock-based compensation expense for the three months ended March 31, 2024 and 2023.
Three Months Ended
March 31,
(in millions)20242023
Stock-based compensation expenses (restricted share units (“RSUs”) and performance-based RSUs (“PRSUs”)), before income taxes$7.2 $7.8 
Tax benefit(0.2)(0.4)
Stock-based compensation expense, net of tax$7.0 $7.4 

As of March 31, 2024, total unrecognized compensation cost related to non-vested RSUs and PRSUs was $48.2 million, which is expected to be recognized over a weighted average period of 2.1 years.

RSUs and PRSUs

The following table summarizes activity for the three months ended March 31, 2024, of RSUs and PRSUs issued to our employees.
ActivityWeighted Average Per Share Grant Date Fair Market Value
Non-vested as of December 31, 20232,781,836 $21.10 
Granted:
RSUs1,547,171 12.43 
PRSUs787,035 12.43 
Vested:
RSUs(861,830)21.62 
PRSUs(410,304)22.07 
Forfeitures:
RSUs(13,404)20.17 
PRSUs(176,427)19.21 
Non-vested as of March 31, 20243,654,077 15.43