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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of stock -based compensation expense in operations | Stock-based compensation expense related to continuing operations is included in Selling, general and administrative expenses in the accompanying Consolidated Statements of Operations as follows (in millions):
| For the Three Months Ended June 30, | For the Six Months Ended June 30,
| 2018 |  | 2017 | 2018 |  | 2017
Stock-based compensation expense (1) | $ | 8.8 |  |  | $ | 7.6 |  | $ | 13.6 |  |  | $ | 12.5 |
(1) All expense was recorded in our Corporate and Other business segment.

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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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