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EARNINGS PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the details of basic and diluted earnings per share:
| Three Months Ended |  |  |  | Six Months Ended |  |
| June 30 |  |  |  | June 30 |  |
(In thousands, except per share data) | 2020 |  | 2019 |  | 2020 |  | 2019
Net (loss) income attributable to WESCO International | $ | (34,506) |  |  | $ | 63,464 |  |  | $ | (100) |  |  | $ | 105,832 |
Less: Preferred stock dividends | 1,276 |  |  | — |  |  | 1,276 |  |  | — |
Net (loss) income attributable to common stockholders | $ | (35,782) |  |  | $ | 63,464 |  |  | $ | (1,376) |  |  | $ | 105,832 |
Weighted-average common shares outstanding used in computing basic earnings per share | 42,683 |  |  | 43,493 |  |  | 42,260 |  |  | 44,280 |
Common shares issuable upon exercise of dilutive equity awards | 92 |  |  | 323 |  |  | 152 |  |  | 381 |
Weighted-average common shares outstanding and common share equivalents, diluted | 42,775 |  |  | 43,816 |  |  | 42,412 |  |  | 44,661 |
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share | 42,683 |  |  | 43,816 |  |  | 42,260 |  |  | 44,661 |
(Loss) earnings per share attributable to common stockholders |  |  |  |  |  |  |
Basic | $ | (0.84) |  |  | $ | 1.46 |  |  | $ | (0.03) |  |  | $ | 2.39 |
Diluted | $ | (0.84) |  |  | $ | 1.45 |  |  | $ | (0.03) |  |  | $ | 2.37 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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