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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2020
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, 2020 and 2019.
Three Months EndedSix Months Ended
June 30,June 30,
(in millions)2020201920202019
Stock-based compensation expenses (restricted share units (“RSUs”) and performance-based RSUs (“PRSUs”)), before income taxes
$6.1  $5.5  $11.9  $10.8  
Tax benefit(0.3) (0.4) (0.7) (0.7) 
Stock-based compensation expense, net of tax$5.8  $5.1  $11.2  $10.1  

As of June 30, 2020, total unrecognized compensation cost related to non-vested RSUs and PRSUs was $35.3 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 six months ended June 30, 2020, of RSUs and PRSUs issued to our employees.
ActivityWeighted Average Per Share Grant Date Fair Market Value
Non-vested as of December 31, 20192,024,768  $22.09  
Granted:
RSUs751,308  29.91  
PRSUs323,771  29.60  
Vested:
RSUs(653,685) 22.88  
PRSUs(298,824) 22.53  
Forfeitures:
RSUs(18,026) 24.87  
PRSUs(1,958) 30.63  
Non-vested as of June 30, 20202,127,354  25.66  

Stock Options

The following table summarizes activity for the six months ended June 30, 2020, of stock options issued to our employees.
ActivityWeighted Average Exercise Price
Outstanding as of December 31, 2019126,528  $24.57  
Exercised(23,115) 16.43  
Outstanding as of June 30, 2020103,413  26.39  
Exercisable as of June 30, 2020103,413  26.39  

As of June 30, 2020, all exercisable stock options issued to our employees were out-of-the-money based on the closing stock price of our common stock of $14.17.