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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [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,
| 2021 |  | 2020 |  | 2021 |  | 2020
Stock-based compensation expense (1) | $ | 8.9 |  |  | $ | 6.7 |  |  | $ | 17.5 |  |  | $ | 10.4 |
(1) All expense was recorded in our Corporate and Other business segment.

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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=120381028&loc=d3e5070-113901 + Details
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