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EMPLOYEE BENEFIT PLANS TEXTUALS (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Feb. 12, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
numberOfPlans
Dec. 31, 2023
USD ($)
numberOfPlans
Dec. 31, 2022
USD ($)
Schedule of Employee Benefit Plans [Line Items]          
Defined contribution plan, cost recognized     $ 74.4 $ 73.4 $ 58.2
Defined Benefit Plan, Description     Wesco sponsors a contributory defined benefit plan covering substantially all Canadian employees of EECOL Electric Corp., a wholly-owned subsidiary of the Company (the “EECOL Plan”). The EECOL Plan provides retirement benefits based on earnings and credited service, and participants contribute 2% of their earnings to the EECOL Plan. Participants become 100% vested after two years of continuous service or, if earlier, at the participant’s normal retirement age.    
Defined Benefit Plan, Unfunded Plan     Wesco also sponsors a Supplemental Executive Retirement Plan for certain executives of EECOL Electric Corp. (the “EECOL SERP”), which provides additional pension benefits based on earnings and credited service. Effective January 1, 2013, the EECOL SERP was closed to new participants and existing participants became 100% vested. Participants of the EECOL SERP now contribute 4% of their earnings to the EECOL Plan.Anixter Inc. sponsored the Anixter Inc. Pension Plan (the “Domestic Plan”), which was closed to entrants first hired or rehired on or after July 1, 2015, and sponsors various defined benefit pension plans covering employees of foreign subsidiaries in Canada and Europe (together with the EECOL Plan and the EECOL SERP, the “Foreign Plans”). The majority of the Company’s defined benefit pension plans are non-contributory, and with the exception of the U.S. and Canada, cover substantially all full-time employees in their respective countries. Retirement benefits are provided based on compensation as defined in each of the plan agreements.    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   4.80% 4.80% 4.40%  
Defined Benefit Plan, Benefit Obligation   $ 274.1 $ 274.1 $ 456.6 520.8
DefinedBenefitPlanNumberOfPlansWithProjectedBenefitObligationsInExcessOfFairValueOfPlanAssets | numberOfPlans     7 9  
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation   31.5 $ 31.5 $ 215.0  
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets   21.1 21.1 183.8  
Defined Benefit Plan, Plan Assets, Amount   294.5 $ 294.5 $ 473.8 552.7
DefinedBenefitPlanNumberOfPlansWithAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssets | numberOfPlans     6 9  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation   15.3 $ 15.3 $ 208.6  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets   7.4 7.4 183.8  
Service Cost     $ 1.9 4.7 8.3
Defined Benefit Plan Assets Actual Gain Loss     1.80%    
Increase (Decrease) in Other Operating Assets     $ 142.6 60.6 153.2
Settlement     $ (139.6) (115.1)  
WESCO [Member]          
Schedule of Employee Benefit Plans [Line Items]          
Defined contribution plan, employer matching contribution, percent     50.00%    
Defined contribution plan, maximum annual contribution per employee, percent     6.00%    
Defined contribution plan, employer discretionary contribution amount     $ 8.9    
WESCO Deferred Compensation Plan          
Schedule of Employee Benefit Plans [Line Items]          
Deferred Compensation Liability, Classified, Noncurrent   $ 32.5 $ 32.5 $ 27.4  
Canadian Defined Contribution Plan Merger          
Schedule of Employee Benefit Plans [Line Items]          
Defined contribution plan, employer matching contribution, percent     50.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match     4.00%    
U.S. Defined Contribution Plan Merger          
Schedule of Employee Benefit Plans [Line Items]          
Defined contribution plan, employer matching contribution, percent     100.00%    
Foreign Plan [Member]          
Schedule of Employee Benefit Plans [Line Items]          
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   4.80% 4.80% 4.40%  
Defined Benefit Plan, Benefit Obligation   $ 274.1 $ 274.1 $ 309.1 267.3
Defined Benefit Plan, Plan Assets, Amount   294.5 294.5 295.7 267.6
Accumulated Benefit Obligation (ABO) at December 31   268.1 268.1 302.5  
Service Cost     1.9 4.7 8.3
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year   7.1 7.1    
Defined Benefit Plan, Expected Future Benefit Payment, Year One   10.3 10.3    
Settlement     (0.8) $ (4.2)  
United States          
Schedule of Employee Benefit Plans [Line Items]          
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate       4.50%  
Defined Benefit Plan, Benefit Obligation   0.0 0.0 $ 147.5 253.5
Defined Benefit Plan, Plan Assets, Amount   0.0 0.0 178.1 285.1
Accumulated Benefit Obligation (ABO) at December 31   0.0 0.0 147.5  
Service Cost     0.0 0.0 0.0
Settlement $ 138.8   (138.8) (110.9)  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan   $ 24.6 33.6    
Excise and Sales Taxes     $ 4.9    
Minimum | Canadian Defined Contribution Plan Merger          
Schedule of Employee Benefit Plans [Line Items]          
Defined contribution plan, employer matching contribution, percent     3.00%    
Minimum | U.S. Defined Contribution Plan Merger          
Schedule of Employee Benefit Plans [Line Items]          
Defined contribution plan, employer matching contribution, percent     3.00%    
Maximum | Canadian Defined Contribution Plan Merger          
Schedule of Employee Benefit Plans [Line Items]          
Defined contribution plan, employer matching contribution, percent     5.00%    
Maximum | U.S. Defined Contribution Plan Merger          
Schedule of Employee Benefit Plans [Line Items]          
Defined contribution plan, employer matching contribution, percent     4.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match     50.00%    
Pension Plan [Member]          
Schedule of Employee Benefit Plans [Line Items]          
Other Nonoperating Gains (Losses)     $ 1.6 $ 0.2 $ (14.8)