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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2021
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, 2021 and 2020:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Stock option compensation expense | $ | 0.6 |  |  | $ | 0.8 |  |  | $ | 2.3 |  |  | $ | 1.6 |
RSU compensation expense | 0.9 |  |  | 2.0 |  |  | 3.4 |  |  | 3.0 |
PSU compensation expense | 2.7 |  |  | (0.3) |  |  | 3.3 |  |  | (1.2) |
Total stock-based compensation expense | $ | 4.2 |  |  | $ | 2.5 |  |  | $ | 9.0 |  |  | $ | 3.4 |
We generally recognize compensation expense for stock-based awards ratably over the vesting period. Stock-based compensation expense for each of the three and six months ended June 30, 2021 and 2020 includes $0.2 million and $1.0 million, of expense related to stock awards granted to eligible non-employee directors, respectively. During the second quarter of 2021, stock compensation grants were made consisting of 19,370 stock options, 2,835 RSUs and 11,622 PSUs and the Company's Board of Directors approved the annual stock compensation grant to eligible non-employee directors, which consisted of 83,167 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, 2021:
| June 30, 2021
| Unrecognized |  | Weighted Average
| Compensation |  | Years Expense To Be
(in millions, except weighted average years) | Expense |  | Recognized Over
Stock options | $4.6 |  | 2.2
RSUs | $5.1 |  | 1.8
PSUs | $14.0 |  | 1.9

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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