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ACQUISITIONS (Details)
 3 Months Ended 9 Months Ended
Jun. 22, 2020
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
countries
numberOfCities
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
countries
numberOfCities
Sep. 30, 2020
USD ($)
Business Acquisition [Line Items]          
Number of Cities in which an Entity Operates | numberOfCities   300   300  
Revenue from Contract with Customer, Excluding Assessed Tax   $ 4,728,325,000 $ 4,141,801,000 $ 13,365,592,000 $ 8,197,154,000
Operating Income (Loss)   229,466,000 178,095,000 581,589,000 254,278,000
Revenues   $ 4,728,325,000 4,141,801,000 $ 13,365,592,000 8,197,154,000
Business Combination, Goodwill Recognized, Description       The resulting goodwill is primarily attributable to Anixter's workforce, significant cross-selling opportunities in additional geographies, enhanced scale, and other operational efficiencies.During the second quarter of 2021, the Company finalized its allocation of the purchase consideration to the respective fair values of assets acquired and liabilities assumed in the acquisition of Anixter. As the Company obtained additional information during the measurement period (one year from the acquisition date), it recorded adjustments to its preliminary estimates of fair value, which are presented in the table below. The net impact of these adjustments was an increase to goodwill of $13.4 million in the second quarter of 2021 and $16.4 million since the Company's initial estimate.  
Gain (Loss) on Disposition of Business       $ (8,927,000) (19,816,000)
Anixter International          
Business Acquisition [Line Items]          
Business Acquisition, Effective Date of Acquisition Jun. 22, 2020        
Common stock, shares, issued (in shares) | shares 0.2397        
Common stock $ 0.01        
Preferred stock, shares issued (in shares) | shares 0.6356        
Preferred stock, par value (in dollars per share) | $ / shares $ 25,000        
Preferred Stock, Dividend Rate, Percentage       10.625%  
Additional countries (in countries) | countries   50   50  
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period       $ 8,000,000,000  
Operating Income (Loss)   $ 165,800,000 80,000,000 437,300,000 98,400,000
Business Acquisition, Adjustments to Pro Forma Net Income (Loss)     1,300,000   5,500,000
Revenues   2,500,000,000 2,200,000,000 7,000,000,000 2,400,000,000
Business Combination, Acquisition Related Costs   $ 35,800,000 $ 14,200,000 $ 119,800,000 $ 92,100,000
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.  
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.  
Anixter International | Cash [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Share Price | $ / shares $ 72.82