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DEBT (Details) - USD ($)
12 Months Ended
Sep. 30, 2024
Jun. 14, 2022
Jun. 14, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 14, 2020
Debt Instrument [Line Items]            
Characteristics of Securitizations or Asset-backed Financing Arrangements that are Accounted for as Sale       Under the Receivables Facility, WESCO sells, on a continuous basis, an undivided interest in all domestic accounts receivable to WESCO Receivables, a wholly owned special purpose entity (the “SPE”). The SPE sells, without recourse, a senior undivided interest in the receivables to financial institutions for cash while maintaining a subordinated undivided interest in the receivables, in the form of overcollateralization. Since WESCO maintains control of the transferred receivables, the transfers do not qualify for “sale” treatment. As a result, the transferred receivables remain on the balance sheet, and WESCO recognizes the related secured borrowing. WESCO has agreed to continue servicing the sold receivables for the third-party conduits and financial institutions at market rates; accordingly, no servicing asset or liability has been recorded.    
Accounts Receivable from Securitization       $ 950,000,000.0 $ 415,000,000.0  
Percentage of principal amount of Senior Notes accelerated under default       0.25    
Debt Issuance Costs, Net       $ (78,850,000) $ (8,876,000)  
Foreign Line of Credit [Member]            
Debt Instrument [Line Items]            
Debt, Weighted Average Interest Rate       3.40% 6.32%  
Long-term debt       $ 29,575,000 $ 26,255,000  
Accounts Receivable Securitization Facility [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Maturity Date       Jun. 22, 2023    
Debt Instrument, Fee       0.45    
Accounts Receivable Eligible for Securitization       $ 1,476,100,000 809,500,000  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate       1.60%    
Long-term debt       $ 950,000,000 415,000,000  
Revolving credit facility            
Debt Instrument [Line Items]            
Line of Credit Facility, Opportunity to Increase Borrowing Capacity       500,000,000    
Debt Instrument, Unused Borrowing Capacity, Amount       $ 1,100,000,000   $ 1,200,000,000
Debt Instrument, Interest Rate During Period       1.60%    
Debt Instrument, Increase, Additional Borrowings       $ 1,197,900,000 715,400,000  
Debt Instrument, Decrease, Repayments       948,000,000.0 767,400,000  
Long-term debt       250,000,000 0  
Line of Credit Facility, Remaining Borrowing Capacity       801,500,000 563,800,000  
Revolving credit facility | Letter of Credit [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Unused Borrowing Capacity, Amount       $ 175,000,000    
Senior Notes [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Maturity Date       Dec. 15, 2021    
Long-term debt       $ 3,730,100,000 850,000,000.0  
Debt Instrument, Interest Rate, Stated Percentage       5.375%    
Debt Instrument, Face Amount       $ 500,000,000    
Deferred Finance Costs, Gross       $ 8,400,000    
Senior Notes due 2024 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Maturity Date       Jun. 15, 2024    
Long-term debt       $ 350,000,000 350,000,000  
Debt Instrument, Interest Rate, Stated Percentage       5.375%    
Debt Instrument, Face Amount       $ 350,000,000    
Deferred Finance Costs, Gross       $ 6,000,000.0    
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed       101.00%    
5.50% Senior Notes due 2023 [Member]            
Debt Instrument [Line Items]            
Long-term debt       $ 58,600,000    
Debt Instrument, Interest Rate, Stated Percentage       5.50%    
Debt Instrument, Face Amount       $ 350,000,000.0    
Senior Notes tender offer consideration per $1,000 principal amount       50.00    
6.00% Senior Notes due 2025 [Member]            
Debt Instrument [Line Items]            
Long-term debt       $ 4,200,000    
Debt Instrument, Interest Rate, Stated Percentage       6.00%    
Debt Instrument, Face Amount       $ 250,000,000.0    
Senior Notes consent fee per $1,000 principal amount       2.50    
Senior Notes tender offer consideration per $1,000 principal amount       $ 1,012.50    
A7125 Senior Notes Due 2025            
Debt Instrument [Line Items]            
Debt Instrument, Maturity Date       Jun. 15, 2025    
Debt Instrument, Issuance Date       Jun. 12, 2020    
Long-term debt       $ 1,500,000,000 0  
Debt Instrument, Interest Rate, Stated Percentage       7.125%    
Debt Instrument, Face Amount       $ 1,500,000,000    
Discount percentage of par value       100.00%    
Deferred Finance Costs, Gross       $ 33,100,000    
Debt Instrument, Redemption Price, Percentage       35.00%    
A7250 Senior Notes Due 2028            
Debt Instrument [Line Items]            
Debt Instrument, Maturity Date       Jun. 15, 2028    
Debt Instrument, Issuance Date       Jun. 12, 2020    
Long-term debt       $ 1,315,668,000 0  
Debt Instrument, Interest Rate, Stated Percentage       7.25%    
Debt Instrument, Face Amount       $ 1,325,000,000    
Discount percentage of par value       99.244%    
Deferred Finance Costs, Gross       $ 29,300,000    
Debt Instrument, Redemption Price, Percentage       35.00%    
Minimum | Foreign Line of Credit [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Current Borrowing Capacity       $ 2,000,000.0    
Minimum | Accounts Receivable Securitization Facility [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Current Borrowing Capacity       $ 600,000,000    
Debt Instrument, Basis Spread on Variable Rate       0.95%    
Maximum | Foreign Line of Credit [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Current Borrowing Capacity       $ 31,000,000.0    
Maximum | Accounts Receivable Securitization Facility [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Current Borrowing Capacity       $ 1,025,000,000   $ 1,200,000,000
Debt Instrument, Basis Spread on Variable Rate       1.20%    
Accordion Feature [Member] | Accounts Receivable Securitization Facility [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Unused Borrowing Capacity, Amount       $ 375,000,000    
Standby Letters of Credit [Member] | Revolving credit facility            
Debt Instrument [Line Items]            
Line of Credit Facility, Remaining Borrowing Capacity       $ 28,400,000 48,500,000  
London Interbank Offered Rate (LIBOR) [Member] | Minimum | Revolving credit facility            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate       1.25%    
London Interbank Offered Rate (LIBOR) [Member] | Maximum | Revolving credit facility            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate       1.50%    
Prime Rate [Member] | Minimum | Revolving credit facility            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate       0.25%    
Prime Rate [Member] | Maximum | Revolving credit facility            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate       0.50%    
Forecast [Member] | Senior Notes due 2024 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 100.00% 101.344% 102.688%      
Surety Bond [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Remaining Borrowing Capacity         36,100,000  
Property Lease Guarantee [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Remaining Borrowing Capacity         $ 7,800,000