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ACQUISITIONS (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) countries numberOfCities $ / shares shares | Dec. 31, 2020 USD ($) shares | Jun. 22, 2020 USD ($) $ / shares shares | Dec. 31, 2019 shares | Dec. 31, 2018 shares
Business Acquisition [Line Items] |  |  |  |  |
Preferred stock, shares issued | shares | 21,612 | 21,612 |  | 0 | 0
Preferred stock, par value | $ / shares | $ 0.01 |  |  |  |
Number of Cities in which an Entity Operates | numberOfCities | 300 |  |  |  |
Anixter International [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Jun. 22, 2020 |  |  |  |
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period | $ 8,000,000,000 |  |  |  |
Common stock, shares issued | shares |  |  | 0.2397 |  |
Preferred stock, shares issued | shares |  |  | 0.6356 |  |
Common Stock |  |  | $ 0.01 |  |
Preferred Stock, Dividend Rate, Percentage | 10.625% |  |  |  |
Preferred stock, par value | $ / shares |  |  | $ 25,000 |  |
Business Acquisition, Description of Acquired Entity | Anixter was a leading distributor of network and security solutions, electrical and electronic solutions, and utility power solutions with locations in over 300 cities across approximately 50 countries, and 2019 annual sales of more than $8 billion. |  |  |  |
Business Combination, Reason for Business Combination | The Merger brought together two companies with highly compatible capabilities and characteristics. The combination of Wesco and Anixter created an enterprise with scale and has afforded the Company the opportunity to digitize its business and expand its services portfolio and supply chain offerings. |  |  |  |
Additional countries (in countries) | countries | 50 |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual | $ 9,500,000,000 | $ 4,500,000,000 |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual | 580,600,000 | 180,000,000 |  |  |
Business Acquisition, Transaction Costs | $ 158,500,000 | $ 132,200,000 |  |  |
Anixter International [Member] | Cash [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Share Price | $ / shares |  |  | $ 72.82 |  |

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