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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 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 six months ended June 30, 2022 and 2021:
|  | Three months ended June 30, |  |  | Six Months Ended June 30, |
(in millions) |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Stock option compensation expense | $ |  | 0.6 |  | $ |  | 0.6 |  | $ |  | 2.7 |  | $ |  | 2.3 |
RSU compensation expense |  |  | 0.9 |  |  |  | 0.9 |  |  |  | 3.0 |  |  |  | 3.4 |
PSU compensation expense |  |  | 0.8 |  |  |  | 2.7 |  |  |  | 1.5 |  |  |  | 3.3 |
Total stock-based compensation expense | $ |  | 2.3 |  | $ |  | 4.2 |  | $ |  | 7.2 |  | $ |  | 9.0 |
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 June 30, 2022:
|  | June 30, 2022
(in millions, except weighted average years) |  | Unrecognized Compensation Expense |  | Weighted Average Years Expense To Be Recognized Over
Stock options |  | $4.9 |  | 2.3
RSUs |  | $5.7 |  | 2.2
PSUs |  | $11.0 |  | 2.1

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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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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