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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
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 is presented in the following table.
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2017 |  | 2016 |  | 2017 |  | 2016
PRSU expense (benefit) | $ | 1.2 |  |  | $ | 1.7 |  |  | $ | (8.1 | ) |  | $ | 4.2 |
Option expense | 1.8 |  |  | 1.1 |  |  | 3.8 |  |  | 2.8 |
RSU/DSU expense | 3.0 |  |  | 1.7 |  |  | 6.9 |  |  | 3.6 |
Total stock-based compensation expense | $ | 6.0 |  |  | $ | 4.5 |  |  | $ | 2.6 |  |  | $ | 10.6 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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