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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
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 September 30, |  |  |  | Nine Months Ended September 30, |  |
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Stock option awards |  | $ | 3.2 |  | $ | 1.8 |  | $ | 7.8 |  | $ | 5.3
Restricted stock awards |  | 2.3 |  | 1.3 |  | 6.4 |  | 3.9
Performance share awards |  | 2.2 |  | 1.4 |  | 6.1 |  | 4.0
Restricted stock units |  | — |  | — |  | 1.4 |  | 1.4
Total stock-based compensation cost |  | $ | 7.7 |  | $ | 4.5 |  | $ | 21.7 |  | $ | 14.6

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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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