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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2026
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | 7. 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, 2026 and 2025:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(in millions) |  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Stock option compensation expense |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 0.1 |
RSU compensation expense |  |  | 3.7 |  |  |  | 1.5 |  |  |  | 5.0 |  |  |  | 4.9 |
PSU compensation expense |  |  | (0.9 | ) |  |  | (1.0 | ) |  |  | 2.2 |  |  |  | 3.3 |
Total stock-based compensation expense |  | $ | 2.8 |  |  | $ | 0.5 |  |  | $ | 7.2 |  |  | $ | 8.3 |
We generally recognize expense for stock-based awards ratably over the vesting period. During the second quarter of 2026, stock compensation grants were made consisting of 1,311,987 PSUs and 31,170 RSUs; in addition, the Company's Board of Directors approved the annual stock compensation grant to eligible non-employee directors, which consisted of 262,472 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, 2026:
|  | June 30, 2026
(in millions, except weighted average years) |  | Unrecognized Compensation Expense |  | Weighted Average Years Expense To Be Recognized Over
RSUs |  | $10.7 |  | 2.3
PSUs |  | $2.9 |  | 1.8

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