XML 23 R16.htm IDEA: XBRL DOCUMENT v3.24.1.u1
Stock-Based Compensation
 3 Months Ended
Mar. 31, 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 months ended March 31, 2024 and 2023:

 

 

 

Three months ended
March 31,

 

(in millions)

 

2024

 

 

2023

 

Stock option compensation expense

 

$

0.2

 

 

$

1.9

 

RSU compensation expense

 

 

3.6

 

 

 

2.3

 

PSU compensation expense

 

 

1.3

 

 

 

1.4

 

Total stock-based compensation expense

 

$

5.1

 

 

$

5.6

 

 

We generally recognize compensation expense for stock-based awards ratably over the vesting period. During the first quarter of 2024, stock compensation grants were made consisting of 1,302,151 RSUs and 1,741,749 PSUs.

 

The following table summarizes our unrecognized compensation expense and the weighted-average period over which the expense will be recognized as of March 31, 2024:

 

 

 

March 31, 2024

(in millions, except weighted average years)

 

Unrecognized Compensation Expense

 

Weighted Average Years Expense To Be Recognized Over

Stock options

 

$0.5

 

1.0

RSUs

 

$10.2

 

2.6

PSUs

 

$7.5

 

2.1