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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 Expense | Stock-based compensation cost by award type follows:
(in millions) |  |  |  |  |  | Three Months Ended March 31, |  |
|  |  |  |  |  | 2019 |  | 2018
Stock option awards |  |  |  |  |  | $ | 3.1 |  | $ | 2.0
Restricted stock awards |  |  |  |  |  | 2.0 |  | 1.9
Performance share awards |  |  |  |  |  | 1.6 |  | 1.7
Restricted stock units |  |  |  |  |  | 1.3 |  | 1.4
Stock appreciation rights |  |  |  |  |  | 0.8 |  | —
Total stock-based compensation cost |  |  |  |  |  | $ | 8.8 |  | $ | 7.0

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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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