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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2016
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 September 30, |  | Nine Months Ended September 30,
(in millions) | 2016 |  | 2015 |  | 2016 |  | 2015
PRSU expense | $ | 1.8 |  |  | $ | 3.0 |  |  | $ | 6.0 |  |  | $ | 10.4 |
Option expense | 1.2 |  |  | 1.4 |  |  | 4.0 |  |  | 4.8 |
RSU/DSU expense | 1.7 |  |  | 0.5 |  |  | 5.3 |  |  | 1.2 |
Total stock-based compensation expense | $ | 4.7 |  |  | $ | 4.9 |  |  | $ | 15.3 |  |  | $ | 16.4 |

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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=6415400&loc=d3e5070-113901 + Details
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