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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 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 and nine months ended September 30, 2020 and 2019:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) | 2020 |  | 2019 |  | 2020 |  | 2019
Stock option compensation expense | $ | 0.5 |  |  | $ | 0.7 |  |  | $ | 2.1 |  |  | $ | 2.0 |
RSU compensation expense | 1.3 |  |  | 1.2 |  |  | 4.3 |  |  | 4.1 |
PSU compensation expense | — |  |  | (1.0) |  |  | (1.2) |  |  | 0.2 |
Total stock-based compensation expense | $ | 1.8 |  |  | $ | 0.9 |  |  | $ | 5.2 |  |  | $ | 6.3 |
We generally recognize compensation expense for stock-based awards ratably over the vesting period. Stock-based compensation expense for each of the nine months ended September 30, 2020 and 2019 includes $1.0 million of expense related to stock awards granted to eligible non-employee directors, which were fully vested on the grant date. During the third quarter of 2020, the Compensation Committee of the Company's Board of Directors approved stock compensation grants which consisted of 34,359 stock options, 10,311 RSUs and 20,618 PSUs. The following table summarizes our unrecognized compensation expense and the weighted-average period over which the expense will be recognized as of September 30, 2020:
| September 30, 2020
| Unrecognized |  | Weighted Average
| Compensation |  | Years Expense To Be
(in millions, except weighted average years) | Expense |  | Recognized Over
Stock options | $4.1 |  | 1.9
RSUs | $6.9 |  | 1.9
PSUs | $0.6 |  | 2.3

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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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