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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 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 nine months ended September 30, 2023 and 2022:
|  | Three months ended September 30, |  | Nine Months Ended September 30,
(in millions) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Stock option compensation expense | $ | 0.3 | $ | 0.4 | $ | 2.4 | $ | 3.1
RSU compensation expense |  | 1.3 |  | 0.8 |  | 4.9 |  | 3.8
PSU compensation expense |  | (0.1) |  | (0.6) |  | 3.1 |  | 0.9
Total stock-based compensation expense | $ | 1.5 | $ | 0.6 | $ | 10.4 | $ | 7.8
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, 2023:
|  | September 30, 2023
(in millions, except weighted average years) |  | Unrecognized Compensation Expense |  | Weighted Average Years Expense To Be Recognized Over
Stock options |  | $1.1 |  | 1.2
RSUs |  | $9.1 |  | 2.2
PSUs |  | $4.2 |  | 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 -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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