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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted |
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
(In thousands, except per share data) |  |  |  |  |
Net income attributable to WESCO International | $ | 223,426 |  |  | $ | 227,343 |  |  | $ | 163,460 |
Weighted-average common shares outstanding used in computing basic earnings per share | 43,104 |  |  | 46,722 |  |  | 47,849 |
Common shares issuable upon exercise of dilutive equity awards | 383 |  |  | 477 |  |  | 512 |
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share | 43,487 |  |  | 47,199 |  |  | 48,361 |
Earnings per share attributable to WESCO International |  |  |  |  |
Basic | $ | 5.18 |  |  | $ | 4.87 |  |  | $ | 3.42 |
Diluted | $ | 5.14 |  |  | $ | 4.82 |  |  | $ | 3.38 |

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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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