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EARNINGS PER SHARE (Tables) | 9 Months Ended
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Sep. 30, 2019
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 |  | Nine Months Ended
| September 30 |  | September 30
(In thousands, except per share data) | 2019 |  | 2018 |  | 2019 |  | 2018
Net income attributable to WESCO International | $ | 64,495 |  |  | $ | 66,849 |  |  | $ | 170,329 |  |  | $ | 169,210 |
Weighted-average common shares outstanding used in computing basic earnings per share | 42,100 |  |  | 47,010 |  |  | 43,545 |  |  | 47,044 |
Common shares issuable upon exercise of dilutive equity awards | 278 |  |  | 476 |  |  | 355 |  |  | 503 |
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share | 42,378 |  |  | 47,486 |  |  | 43,900 |  |  | 47,547 |
Earnings per share attributable to WESCO International |  |  |  |  |  |  |
Basic | $ | 1.53 |  |  | $ | 1.42 |  |  | $ | 3.91 |  |  | $ | 3.60 |
Diluted | $ | 1.52 |  |  | $ | 1.41 |  |  | $ | 3.88 |  |  | $ | 3.56 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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