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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 stock-based compensation expense | A summary of the Company’s stock-based compensation expense (benefit) is presented in the following table:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) | 2018 |  | 2017 |  | 2018 |  | 2017
PRSU expense (benefit) | $ | 0.7 |  |  | $ | 1.0 |  |  | $ | 2.2 |  |  | $ | (7.1 | )
Option expense | 1.6 |  |  | 1.8 |  |  | 5.4 |  |  | 5.6 |
RSU/DSU expense | 4.2 |  |  | 3.1 |  |  | 12.0 |  |  | 10.0 |
Total stock-based compensation expense | $ | 6.5 |  |  | $ | 5.9 |  |  | $ | 19.6 |  |  | $ | 8.5 |

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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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