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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] |
Components of Stock-Based Compensation Expense | A summary of the total compensation expense and associated income tax benefits recognized under the Omnibus Plan are as follows (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Compensation expense | $ | 3.0 |  |  | $ | 1.7 |  |  | $ | 4.5 |  |  | $ | 2.7 |
Income tax benefit | (1.2 | ) |  | (0.6 | ) |  | (1.8 | ) |  | (1.0 | )
Total | $ | 1.8 |  |  | $ | 1.1 |  |  | $ | 2.7 |  |  | $ | 1.7 |

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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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