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ACQUISITIONS (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
numberOfEmployees
countries
numberOfCities
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
numberOfEmployees
countries
numberOfCities
Sep. 30, 2019
USD ($)
Jun. 22, 2020
USD ($)
$ / shares
shares
Business Acquisition [Line Items]          
Number of Cities in which an Entity Operates | numberOfCities 300   300    
Revenue from Contract with Customer, Excluding Assessed Tax $ 4,141,801,000 $ 2,148,110,000 $ 8,197,154,000 $ 6,259,465,000  
Operating Income (Loss) 178,095,000 93,733,000 254,278,000 262,409,000  
Revenues $ 4,141,801,000 2,148,110,000 $ 8,197,154,000 6,259,465,000  
Business Combination, Provisional Information, Initial Accounting Incomplete, Reasons     The estimated fair values of assets acquired and liabilities assumed are based on preliminary calculations and valuations using estimates and assumptions at the time of acquisition. The determination of the fair values of assets acquired and liabilities assumed, especially those related to identifiable intangible assets, is preliminary due to the complexity of combining multibillion dollar businesses. Accordingly, as the Company obtains additional information during the measurement period (not to exceed one year from the acquisition date), estimates and assumptions for the preliminary purchase consideration allocations may change materially.    
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 should afford the Company the opportunity to digitize its business, and expand its services portfolio and supply chain offerings.    
Business Acquisition, Description of Acquired Entity     Anixter is 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, 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.In the third quarter of 2020, the Company recognized adjustments to total identifiable intangible assets and deferred income taxes of $5.4 million and $7.3 million, respectively. Certain other measurement period adjustments were made to the identified assets acquired and liabilities assumed, none of which were significant, individually or in aggregate. The net impact of the adjustments made in the third quarter of 2020 was a decrease to goodwill of $7.6 million.    
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) $ 80,000,000.0   98,400,000    
Revenues 2,200,000,000   2,400,000,000    
Business Combination, Acquisition Related Costs $ 14,500,000   $ 92,100,000    
Anixter International | Cash [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Share Price | $ / shares         $ 72.82
Sylvania Lighting Services Corp. [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Effective Date of Acquisition     Mar. 05, 2019    
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period     $ 100,000,000    
Number of Employees Employed by the Entity | numberOfEmployees 220   220    
Business Acquisition, Goodwill, Expected Tax Deductible Amount   $ 11,600,000   $ 11,600,000