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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 |

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