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EARNINGS PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2025
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 |  | Six Months Ended
| June 30 |  | June 30
(In millions, except per share data) | 2025 |  | 2024 |  | 2025 |  | 2024
Net income attributable to WESCO International, Inc. | $ | 174.5 |  |  | $ | 232.1 |  |  | $ | 292.9 |  |  | $ | 347.9 |
Plus: Gain on redemption of Series A Preferred Stock | 27.6 |  |  | — |  |  | 27.6 |  |  | — |
Less: Preferred stock dividends | 12.9 |  |  | 14.4 |  |  | 27.3 |  |  | 28.7 |
Net income attributable to common stockholders | $ | 189.2 |  |  | $ | 217.7 |  |  | $ | 293.2 |  |  | $ | 319.2 |
Weighted-average common shares outstanding used in computing basic earnings per share | 48.8 |  |  | 50.2 |  |  | 48.8 |  |  | 50.5 |
Common shares issuable upon exercise of dilutive equity awards | 0.6 |  |  | 0.7 |  |  | 0.7 |  |  | 0.8 |
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share | 49.4 |  |  | 50.9 |  |  | 49.5 |  |  | 51.3 |
Earnings per share attributable to common stockholders |  |  |  |  |  |  |
Basic | $ | 3.88 |  |  | $ | 4.34 |  |  | $ | 6.01 |  |  | $ | 6.32 |
Diluted | $ | 3.83 |  |  | $ | 4.28 |  |  | $ | 5.92 |  |  | $ | 6.22 |

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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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