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ACQUISITIONS (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
countries
numberOfEmployees
numberOfCities
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
countries
numberOfEmployees
numberOfCities
Jun. 30, 2019
USD ($)
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 $ 2,086,706,000 $ 2,150,088,000 $ 4,055,353,000 $ 4,111,355,000  
Operating Income (Loss) 15,270,000 97,950,000 76,183,000 168,675,000  
Revenues 2,086,706,000 2,150,088,000 $ 4,055,353,000 4,111,355,000  
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 timing of the completion of the Merger and the complexity of combining a multibillion dollar business. Accordingly, as the Company obtains additional information during the measurement period (not to exceed one year from the acquisition date), WESCO's estimates and assumptions for its preliminary purchase consideration allocations may change materially.    
Business Combination, Reason for Business Combination     The Merger brings together two companies with highly compatible capabilities and characteristics. The combination of WESCO and Anixter will create 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     Headquartered near Chicago, Illinois, 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 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.    
Anixter International          
Business Acquisition [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 221,857,000 0 $ 221,857,000 0  
Operating Income (Loss) 18,367,000 0 18,367,000 0  
Revenues $ 221,857,000 0 $ 221,857,000 0  
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    
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual     18,400,000    
Business Combination, Acquisition Related Costs $ 73,300,000   $ 78,000,000.0    
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  
Anixter International acquisition [Member]          
Business Acquisition [Line Items]          
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual     $ 221,900,000