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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 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 months ended March 31, 2019 and 2018:
| Three Months Ended March 31,
(in millions) | 2019 |  | 2018
Stock option compensation expense | $ | 0.5 |  |  | $ | 0.5 |
RSU compensation expense | 1.0 |  |  | 0.9 |
PSU compensation expense | 0.5 |  |  | 1.8 |
Total stock-based compensation expense | $ | 2.0 |  |  | $ | 3.2 |
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 March 31, 2019:
| March 31, 2019
| Unrecognized |  | Weighted Average
| Compensation |  | Years Expense To Be
(in millions, except weighted average years) | Expense |  | Recognized Over
Stock options | $5.8 |  | 2.5
RSUs | $7.4 |  | 2.2
PSUs | $5.5 |  | 2.1

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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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