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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 stock-based compensation expense | A summary of the Company’s stock-based compensation expense is presented in the following table:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
PRSU expense | $ | 0.4 |  |  | $ | 0.7 |  |  | $ | 0.7 |  |  | $ | 1.5 |
Option expense | 1.2 |  |  | 1.9 |  |  | 2.4 |  |  | 3.8 |
RSU/DSU expense | 5.0 |  |  | 4.2 |  |  | 10.1 |  |  | 7.8 |
Total stock-based compensation expense | $ | 6.6 |  |  | $ | 6.8 |  |  | $ | 13.2 |  |  | $ | 13.1 |

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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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