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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2022
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, 2022 and 2021:

 

 

 

Three months ended
September 30,

 

 

Nine Months Ended
September 30,

 

(in millions)

 

2022

 

 

2021

 

 

2022

 

 

2021

 

Stock option compensation expense

$

 

0.4

 

$

 

0.6

 

$

 

3.1

 

$

 

2.9

 

RSU compensation expense

 

 

0.8

 

 

 

0.9

 

 

 

3.8

 

 

 

4.3

 

PSU compensation expense

 

 

(0.6

)

 

 

1.7

 

 

 

0.9

 

 

 

5.0

 

Total stock-based compensation expense

$

 

0.6

 

$

 

3.2

 

$

 

7.8

 

$

 

12.2

 

 

We generally recognize compensation expense for stock-based awards ratably over the vesting period.

 

During the third quarter of 2022, stock compensation grants were made consisting of 14,246 stock options, 25,613 RSUs and 8,548 PSUs.

 

The following table summarizes our unrecognized compensation expense and the weighted-average period over which the expense will be recognized as of September 30, 2022:

 

 

 

September 30, 2022

(in millions, except weighted average years)

 

Unrecognized Compensation Expense

 

Weighted Average Years Expense To Be Recognized Over

Stock options

 

$4.2

 

2.2

RSUs

 

$4.9

 

2.0

PSUs

 

$1.6

 

1.0