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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2020
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, 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 |
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, 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 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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