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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