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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation

6. Stock-Based Compensation

 

The following table summarizes our stock-based compensation expense (including stock options, restricted stock units ("RSUs") and performance stock units ("PSUs") for the three and nine months ended September 30, 2024 and 2023:

 

 

 

Three months ended
September 30,

 

 

Nine Months Ended
September 30,

 

(in millions)

 

2024

 

 

2023

 

 

2024

 

 

2023

 

Stock option compensation expense

 

$

0.1

 

 

$

0.3

 

 

$

0.4

 

 

$

2.4

 

RSU compensation expense

 

 

1.3

 

 

 

1.3

 

 

 

6.3

 

 

 

4.9

 

PSU compensation expense

 

 

0.2

 

 

 

(0.1

)

 

 

2.5

 

 

 

3.1

 

Total stock-based compensation expense

 

$

1.6

 

 

$

1.5

 

 

$

9.2

 

 

$

10.4

 

 

 

The following table summarizes our unrecognized compensation expense and the weighted-average period over which the expense will be recognized as of September 30, 2024:

 

 

 

September 30, 2024

(in millions, except weighted average years)

 

Unrecognized Compensation Expense

 

Weighted Average Years Expense To Be Recognized Over

Stock options

 

$0.2

 

0.5

RSUs

 

$8.4

 

2.1

PSUs

 

$4.5

 

1.7