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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2022
Share-Based Payment Arrangement [Abstract] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan | 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, 2022 and 2021:
|  | Three months ended September 30, |  |  | Nine Months Ended September 30, |
(in millions) |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Stock option compensation expense | $ |  | 0.4 |  | $ |  | 0.6 |  | $ |  | 3.1 |  | $ |  | 2.9 |
RSU compensation expense |  |  | 0.8 |  |  |  | 0.9 |  |  |  | 3.8 |  |  |  | 4.3 |
PSU compensation expense |  |  | (0.6 | ) |  |  | 1.7 |  |  |  | 0.9 |  |  |  | 5.0 |
Total stock-based compensation expense | $ |  | 0.6 |  | $ |  | 3.2 |  | $ |  | 7.8 |  | $ |  | 12.2 |
Schedule of Unrecognized Compensation Cost, Nonvested Awards | The following table summarizes our unrecognized compensation expense and the weighted-average period over which the expense will be recognized as of September 30, 2022:
|  | September 30, 2022
(in millions, except weighted average years) |  | Unrecognized Compensation Expense |  | Weighted Average Years Expense To Be Recognized Over
Stock options |  | $4.2 |  | 2.2
RSUs |  | $4.9 |  | 2.0
PSUs |  | $1.6 |  | 1.0

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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