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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2023
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, 2023 and 2022:
|  | Three months ended June 30, |  | Six Months Ended June 30,
(in millions) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Stock option compensation expense | $ | 0.2 | $ | 0.6 | $ | 2.1 | $ | 2.7
RSU compensation expense |  | 1.3 |  | 0.9 |  | 3.6 |  | 3.0
PSU compensation expense |  | 1.8 |  | 0.8 |  | 3.2 |  | 1.5
Total stock-based compensation expense | $ | 3.3 | $ | 2.3 | $ | 8.9 | $ | 7.2
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 June 30, 2023:
|  | June 30, 2023
(in millions, except weighted average years) |  | Unrecognized Compensation Expense |  | Weighted Average Years Expense To Be Recognized Over
Stock options |  | $1.4 |  | 1.5
RSUs |  | $10.2 |  | 2.4
PSUs |  | $6.3 |  | 2.2

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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Subparagraph (i) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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