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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Compensation Expense | Stock-based compensation cost by award type follows:
(in millions) |  | Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Stock option awards |  | $ | 2.5 |  | $ | 2.3 |  | $ | 5.6 |  | $ | 4.3
Restricted stock awards |  | 2.1 |  | 2.3 |  | 4.1 |  | 4.2
Performance share awards |  | 1.5 |  | 2.5 |  | 3.1 |  | 4.2
Restricted stock units |  | — |  | 0.1 |  | 1.3 |  | 1.5
Stock appreciation rights |  | 2.1 |  | — |  | 2.9 |  | —
Total stock-based compensation cost |  | $ | 8.2 |  | $ | 7.2 |  | $ | 17.0 |  | $ | 14.2

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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=116856206&loc=d3e5070-113901 + Details
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