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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2023
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 six months ended June 30, 2023 and 2022:
|  | Three months ended June 30, |  | Six Months Ended June 30,
(in millions) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Stock option compensation expense | $ | 0.2 | $ | 0.6 | $ | 2.1 | $ | 2.7
RSU compensation expense |  | 1.3 |  | 0.9 |  | 3.6 |  | 3.0
PSU compensation expense |  | 1.8 |  | 0.8 |  | 3.2 |  | 1.5
Total stock-based compensation expense | $ | 3.3 | $ | 2.3 | $ | 8.9 | $ | 7.2
We generally recognize compensation expense for stock-based awards ratably over the vesting period. During the second quarter of 2023, stock compensation grants were made consisting of 47,510 RSUs and 21,251 PSUs. The Company's Board of Directors also approved the annual stock compensation grant to eligible non-employee directors, which consisted of 190,840 RSUs. The following table summarizes our unrecognized compensation expense and the weighted-average period over which the expense will be recognized as of June 30, 2023:
|  | June 30, 2023
(in millions, except weighted average years) |  | Unrecognized Compensation Expense |  | Weighted Average Years Expense To Be Recognized Over
Stock options |  | $1.4 |  | 1.5
RSUs |  | $10.2 |  | 2.4
PSUs |  | $6.3 |  | 2.2

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