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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2020
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 months ended March 31, 2020 and 2019:
| Three Months Ended March 31,
(in millions) | 2020 |  | 2019
Stock option compensation expense | $ | 0.8 |  |  | $ | 0.5 |
RSU compensation expense | 1.0 |  |  | 1.0 |
PSU compensation expense | (0.9 | ) |  | 0.5 |
Total stock-based compensation expense | $ | 0.9 |  |  | $ | 2.0 |
We generally recognize compensation expense for stock-based awards ratably over the vesting period. During the first quarter of 2020, the Company's Board of Directors approved stock compensation grants which consisted of 1,402,829 stock options, 600,014 RSUs and 918,911 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, 2020:
| March 31, 2020
| Unrecognized |  | Weighted Average
| Compensation |  | Years Expense To Be
(in millions, except weighted average years) | Expense |  | Recognized Over
Stock options | $6.9 |  | 2.4
RSUs | $9.3 |  | 2.3
PSUs | $3.2 |  | 2.5

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