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EARNINGS PER SHARE (Tables) | 9 Months Ended
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Sep. 30, 2023
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the computation of basic and diluted earnings per share for the periods presented:
| Three Months Ended |  | Nine Months Ended
| September 30 |  | September 30
(In millions, except per share data) | 2023 |  | 2022(1) |  | 2023 |  | 2022(1)
Net income attributable to WESCO International, Inc. | $ | 233.4 |  |  | $ | 239.6 |  |  | $ | 623.6 |  |  | $ | 641.6 |
Less: Preferred stock dividends | 14.4 |  |  | 14.4 |  |  | 43.1 |  |  | 43.1 |
Net income attributable to common stockholders | $ | 219.0 |  |  | $ | 225.2 |  |  | $ | 580.5 |  |  | $ | 598.5 |
Weighted-average common shares outstanding used in computing basic earnings per share | 51.2 |  |  | 50.8 |  |  | 51.2 |  |  | 50.7 |
Common shares issuable upon exercise of dilutive equity awards | 1.0 |  |  | 1.6 |  |  | 1.2 |  |  | 1.7 |
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share | 52.2 |  |  | 52.4 |  |  | 52.4 |  |  | 52.4 |
Earnings per share attributable to common stockholders |  |  |  |  |  |  |
Basic | $ | 4.28 |  |  | $ | 4.43 |  |  | $ | 11.34 |  |  | $ | 11.80 |
Diluted | $ | 4.20 |  |  | $ | 4.30 |  |  | $ | 11.08 |  |  | $ | 11.42 |

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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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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