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INCOME TAXES - ADDITIONAL INFORMATION (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating Loss Carryforwards [Line Items]        
Amortization of intangible assets $ 564.5 $ 575.4    
Deferred Tax Assets, Operating Loss Carryforwards 36.7 32.0    
Deferred Tax Assets, Tax Credit Carryforwards, Foreign 41.1 52.2    
Deferred Tax Assets, Valuation Allowance 23.5 33.7    
Unrecognized Tax Benefits 121.3 109.3 $ 107.3 $ 68.1
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 40.1 40.6 36.1  
Decrease in Unrecognized Tax Benefits is Reasonably Possible 16.5      
Interest related to uncertain tax positions 1.1 2.3 $ 0.9  
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 8.9 9.6    
Undistributed Earnings of Foreign Subsidiaries 2,194.1      
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries 119.3      
Unrecognized Tax Benefits, Income Tax Penalties Accrued 4.7 4.8    
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability 53.8      
Deferred Tax Asset, Interest Carryforward $ 1.9 4.8    
Income Tax Examination, Description On October 22, 2021, one of the Company's Mexican affiliates received a tax assessment from the Mexican tax authorities in the amount of approximately $26.0 million related to its 2012 income tax return. This amount, updated for adjustments required under Mexican law, was approximately $33.0 million as of December 31, 2023. The Company believes the assessment is without merit and has filed an annulment lawsuit in the Mexican Federal Court of Administrative Justice. The Company expects to prevail in this litigation and, accordingly, has not recognized a liability for this assessment in its consolidated financial statements.In July 2022, one of the Company's Canadian affiliates received tax assessments from the Canada Revenue Agency (“CRA”) totaling approximately $11.0 million, including tax and interest, related to its 2012 through 2014 income tax returns. The Company's Canadian affiliate received a related penalty assessment of approximately $2.7 million in May 2023. The Company believes these assessments are without merit and has appealed to the Tax Court of Canada. The Company intends to avail itself of all avenues to appeal, as necessary to overturn the assessments and expects to prevail. Therefore, the Company has not recognized a liability for these assessments in its consolidated financial statements. The CRA continues to audit the 2015 and 2016 tax years of Wesco's Canadian affiliates and has made inquiries into their 2017 through 2019 income tax returns. The Company expects to eventually receive similar assessments for these tax years.      
General Business Tax Credit Carryforward [Member]        
Operating Loss Carryforwards [Line Items]        
Deferred Tax Assets, Valuation Allowance $ 2.9 6.1    
State and Local Jurisdiction [Member]        
Operating Loss Carryforwards [Line Items]        
Operating Loss Carryforwards, Valuation Allowance 1.0      
Deferred Tax Assets, Operating Loss Carryforwards 3.0 4.4    
Deferred Tax Assets, Valuation Allowance 0.5      
Deferred Tax Asset, Interest Carryforward 1.9 4.8    
Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 7.6      
Foreign Tax Authority        
Operating Loss Carryforwards [Line Items]        
Deferred Tax Assets, Operating Loss Carryforwards, Foreign 31.4 27.6    
Operating Loss Carryforwards, Valuation Allowance 12.9 16.7    
Deferred Tax Assets, Tax Deferred Expense, Other 6.1 10.9    
Deferred Tax Assets, Tax Credit Carryforwards, Foreign $ 41.1 $ 52.2