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EARNINGS PER SHARE (Tables) | 9 Months Ended
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Sep. 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 |  | Nine Months Ended
| September 30 |  | September 30
(In thousands, except per share data) | 2020 |  | 2019 |  | 2020 |  | 2019
Net income attributable to WESCO International | $ | 80,678 |  |  | $ | 64,495 |  |  | $ | 80,578 |  |  | $ | 170,329 |
Less: Preferred stock dividends | 14,511 |  |  | — |  |  | 15,787 |  |  | — |
Net income attributable to common stockholders | $ | 66,167 |  |  | $ | 64,495 |  |  | $ | 64,791 |  |  | $ | 170,329 |
Weighted-average common shares outstanding used in computing basic earnings per share | 50,043 |  |  | 42,100 |  |  | 44,873 |  |  | 43,545 |
Common shares issuable upon exercise of dilutive equity awards | 444 |  |  | 278 |  |  | 231 |  |  | 355 |
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share | 50,487 |  |  | 42,378 |  |  | 45,104 |  |  | 43,900 |
Earnings per share attributable to common stockholders |  |  |  |  |  |  |
Basic | $ | 1.32 |  |  | $ | 1.53 |  |  | $ | 1.44 |  |  | $ | 3.91 |
Diluted | $ | 1.31 |  |  | $ | 1.52 |  |  | $ | 1.44 |  |  | $ | 3.88 |

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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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