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EMPLOYEE BENEFIT PLANS TEXTUALS (Details)
$ in Millions
 2 Months Ended 12 Months Ended
Feb. 16, 2024
USD ($)
Dec. 31, 2023
USD ($)
numberOfPlans
Dec. 31, 2022
USD ($)
numberOfPlans
Dec. 31, 2021
USD ($)
Schedule of Employee Benefit Plans [Line Items]        
Defined contribution plan, cost recognized   $ 73.4 $ 58.2 $ 54.7
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. sponsors the Anixter Inc. Pension Plan, which was closed to entrants first hired or rehired on or after July 1, 2015, and 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   4.40% 4.60%  
Defined Benefit Plan, Benefit Obligation   $ 456.6 $ 520.8 725.9
DefinedBenefitPlanNumberOfPlansWithProjectedBenefitObligationsInExcessOfFairValueOfPlanAssets | numberOfPlans   9 7  
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation   $ 215.0 $ 119.0  
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets   183.8 91.0  
Defined Benefit Plan, Plan Assets, Amount   $ 473.8 $ 552.7 752.5
DefinedBenefitPlanNumberOfPlansWithAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssets | numberOfPlans   9 7  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation   $ 208.6 $ 113.7  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets   183.8 91.0  
Service Cost   $ 4.7 8.3 15.2
Defined Benefit Plan Assets Actual Gain Loss   7.00%    
Defined Benefit Plan, Expected Future Benefit Payment, Year One   $ 159.1    
Increase (Decrease) in Other Operating Assets   60.6 153.2 56.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment   0.0 0.0 36.6
Settlement   $ (115.1) (0.2)  
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       13.1
Anixter Employee Savings Plan [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   5.00%    
WESCO Deferred Compensation Plan        
Schedule of Employee Benefit Plans [Line Items]        
Deferred Compensation Liability, Classified, Noncurrent     $ 20.3  
AnixterDeferred Compensation Plan        
Schedule of Employee Benefit Plans [Line Items]        
Deferred Compensation Arrangement with Individual, Distribution Paid       42.8
Increase (Decrease) in Other Operating Assets       39.7
Defined Contribution Pension Plan for Employees of Anixter Canada Inc.        
Schedule of Employee Benefit Plans [Line Items]        
Defined contribution plan, employer matching contribution, percent   6.00%    
Defined contribution plan, maximum annual contribution per employee, percent   5.50%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match   25.00%    
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   4.40% 4.80%  
Defined Benefit Plan, Benefit Obligation   $ 309.1 $ 267.3 424.1
Defined Benefit Plan, Plan Assets, Amount   295.7 267.6 381.8
Accumulated Benefit Obligation (ABO) at December 31   302.5 253.2  
Service Cost   4.7 8.3 12.1
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year   7.0    
Defined Benefit Plan, Expected Future Benefit Payment, Year One   10.5    
Settlement   $ (4.2) $ (0.2)  
United States        
Schedule of Employee Benefit Plans [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   4.50% 4.40%  
Defined Benefit Plan, Benefit Obligation   $ 147.5 $ 253.5 301.8
Defined Benefit Plan, Plan Assets, Amount   178.1 285.1 370.7
Accumulated Benefit Obligation (ABO) at December 31   147.5 253.5  
Service Cost   0.0 0.0 3.0
Defined Benefit Plan, Expected Future Benefit Payment, Year One   148.6    
Settlement   $ (110.9) 0.0  
United States | Subsequent Event        
Schedule of Employee Benefit Plans [Line Items]        
Settlement $ 138.8      
Minimum | WESCO Distribution Canada Defined Contribution plan [Member]        
Schedule of Employee Benefit Plans [Line Items]        
Defined contribution plan, employer matching contribution, percent   3.00%    
Defined Contribution Plan, Employer Matching Contribution greater than 20 years of service, Percent of Employees' Gross Pay   5.00%    
Minimum | Anixter Employee Savings Plan [Member]        
Schedule of Employee Benefit Plans [Line Items]        
Defined contribution discretionary contribution percentage   2.00%    
Minimum | Defined Contribution Pension Plan for Employees of Anixter Canada Inc.        
Schedule of Employee Benefit Plans [Line Items]        
Defined contribution plan, employer matching contribution, percent   3.00%    
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 | WESCO Distribution Canada Defined Contribution plan [Member]        
Schedule of Employee Benefit Plans [Line Items]        
Defined contribution plan, employer matching contribution, percent   5.00%    
Defined Contribution Plan, Employer Matching Contribution greater than 20 years of service, Percent of Employees' Gross Pay   7.00%    
Maximum | Anixter Employee Savings Plan [Member]        
Schedule of Employee Benefit Plans [Line Items]        
Defined contribution discretionary contribution percentage   2.50%    
Maximum | Defined Contribution Pension Plan for Employees of Anixter Canada Inc.        
Schedule of Employee Benefit Plans [Line Items]        
Defined contribution plan, employer matching contribution, percent   4.00%    
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)   $ 0.2 $ (14.8) $ (53.2)
WESCO Deferred Compensation Plan        
Schedule of Employee Benefit Plans [Line Items]        
Deferred Compensation Liability, Classified, Noncurrent   $ 27.4