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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
The following table summarizes our stock-based compensation expense for the three and six months ended June 30, 2024 and 2023.
Three Months EndedSix Months Ended
June 30,June 30,
(in millions)2024202320242023
Stock-based compensation expenses (restricted share units (“RSUs”) and performance-based RSUs (“PRSUs”)), before income taxes$7.6 $7.9 $14.8 $15.7 
Tax benefit(0.4)(0.1)(0.6)(0.5)
Stock-based compensation expense, net of tax$7.2 $7.8 $14.2 $15.2 

As of June 30, 2024, total unrecognized compensation cost related to non-vested RSUs and PRSUs was $41.0 million, which is expected to be recognized over a weighted average period of 1.9 years.

RSUs and PRSUs

The following table summarizes activity for the six months ended June 30, 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:
RSUs1,649,172 12.52 
PRSUs796,689 12.43 
Vested:
RSUs(965,084)21.04 
PRSUs(417,637)22.06 
Forfeitures:
RSUs(77,316)14.91 
PRSUs(196,486)18.66 
Non-vested as of June 30, 20243,571,174 15.37