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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [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, 2019 and 2018:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Stock option compensation expense | $ | 0.8 |  |  | $ | 0.5 |  |  | $ | 1.3 |  |  | $ | 1.0 |
RSU compensation expense | 1.9 |  |  | 2.0 |  |  | 2.9 |  |  | 2.9 |
PSU compensation expense | 0.7 |  |  | 1.5 |  |  | 1.2 |  |  | 3.3 |
Total stock-based compensation expense | $ | 3.4 |  |  | $ | 4.0 |  |  | $ | 5.4 |  |  | $ | 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, 2019:
| June 30, 2019
| Unrecognized |  | Weighted Average
| Compensation |  | Years Expense To Be
(in millions, except weighted average years) | Expense |  | Recognized Over
Stock options | $5.0 |  | 2.2
RSUs | $8.0 |  | 2.2
PSUs | $8.3 |  | 2.2

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + 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=109197908&loc=d3e5070-113901 + Details
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