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EARNINGS PER SHARE (Tables) | 3 Months Ended
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Mar. 31, 2021
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 |  |
| March 31 |  |
(In thousands, except per share data) | 2021 |  | 2020 |  |  |  |
Net income attributable to WESCO International, Inc. | $ | 59,178 |  |  | $ | 34,407 |  |  |  |  |
Less: Preferred stock dividends | 14,352 |  |  | — |  |  |  |  |
Net income attributable to common stockholders | $ | 44,826 |  |  | $ | 34,407 |  |  |  |  |
Weighted-average common shares outstanding used in computing basic earnings per share | 50,124 |  |  | 41,837 |  |  |  |  |
Common shares issuable upon exercise of dilutive equity awards | 1,584 |  |  | 238 |  |  |  |  |
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share | 51,708 |  |  | 42,075 |  |  |  |  |
Earnings per share attributable to common stockholders |  |  |  |  |  |  |
Basic | $ | 0.89 |  |  | $ | 0.82 |  |  |  |  |
Diluted | $ | 0.87 |  |  | $ | 0.82 |  |  |  |  |

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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=124432515&loc=d3e3550-109257 + Details
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