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Compensation Related Costs, Postemployment Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Defined Contribution Plan Disclosure [Line Items]          
Postemployment Benefits, Period Expense $ 16,400 $ 3,500 $ 49,100 $ 12,600  
Service cost 4,015 3,826 12,082 6,801  
Interest cost 4,483 4,844 13,520 7,170  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 8,691 8,399 26,139 12,001  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (103) 1 (311) (52)  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement     19 0  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (90) 270 (245) 2,022  
Increase (Decrease) in Other Operating Assets     (19,299) 26,655  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Postemployment Benefits, Period Expense 16,400 3,500 49,100 12,600  
Defined Benefit Plan, Plan Assets, Contributions by Employer 2,400 2,200 8,100 4,000  
Increase (Decrease) in Other Operating Assets     (19,299) 26,655  
UNITED STATES          
Defined Contribution Plan Disclosure [Line Items]          
Service cost 764 824 2,291 944  
Interest cost 2,018 2,299 6,095 2,565  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 4,414 4,041 13,241 4,498  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 0 0 0 0  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement     19 0  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (1,632) (918) (4,874) (989)  
Foreign Plan          
Defined Contribution Plan Disclosure [Line Items]          
Service cost 3,251 3,002 9,791 5,857  
Interest cost 2,465 2,545 7,425 4,605  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 4,277 4,358 12,898 7,503  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (103) 1 (311) (52)  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement     0 0  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 1,542 1,188 4,629 3,011  
WESCO          
Defined Contribution Plan Disclosure [Line Items]          
Deferred Compensation Liability, Classified, Noncurrent         $ 17,300
WESCODeferredCompensationPlanMember          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Deferred Compensation Liability, Current and Noncurrent         27,400
Deferred Compensation Liability, Current and Noncurrent         27,400
Pension Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Defined Benefit Plan, Expected Future Benefit Payment, Year One 18,100   18,100    
Defined Benefit Plan, Expected Future Benefit Payment, Year One 18,100   18,100    
Defined Benefit Plan, Plan Assets, Contributions by Employer     10,400    
Other Nonoperating Gains (Losses) (4,100) (3,600) $ (12,300) (4,800)  
Canadian 401K Defined Contribution Plan [Member] | Minimum [Member]          
Defined Contribution Plan Disclosure [Line Items]          
Defined Contribution Plan Employer Matching Contribution Percent     3.00%    
Canadian 401K Defined Contribution Plan [Member] | Maximum [Member]          
Defined Contribution Plan Disclosure [Line Items]          
Defined Contribution Plan Employer Matching Contribution Percent     5.00%    
US 401K Defined Contribution Plan [Member]          
Defined Contribution Plan Disclosure [Line Items]          
Defined Contribution Plan, Employer Matching Contribution, Percent of Match     50.00%    
Defined Contribution Plan Employer Matching Contribution Percent     6.00%    
Anixter Employee Savings Plan [Member]          
Defined Contribution Plan Disclosure [Line Items]          
Defined Contribution Plan, Employer Matching Contribution, Percent of Match     50.00%    
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent     5.00%    
Anixter Employee Savings Plan [Member] | Minimum [Member]          
Defined Contribution Plan Disclosure [Line Items]          
Defined Contribution Plan Employer Matching Contribution Percent     2.00%    
Anixter Employee Savings Plan [Member] | Maximum [Member]          
Defined Contribution Plan Disclosure [Line Items]          
Defined Contribution Plan Employer Matching Contribution Percent     2.50%    
WESCODeferredCompensationPlanMember          
Defined Contribution Plan Disclosure [Line Items]          
Deferred Compensation Liability, Current         10,100
Deferred Compensation Liability, Classified, Noncurrent 19,900   $ 19,900    
Anixter Deferred Compensation Plan Member          
Defined Contribution Plan Disclosure [Line Items]          
Assets Held-in-trust         39,600
Deferred Compensation Liability, Current         45,100
Increase (Decrease) in Other Operating Assets     39,700    
Deferred Compensation Arrangement with Individual, Distribution Paid     42,800    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Deferred Compensation Arrangement with Individual, Distribution Paid     42,800    
Increase (Decrease) in Other Operating Assets     $ 39,700    
Phantom Share Units (PSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years    
Share-based Payment Arrangement, Expense 3,400 $ 1,400 $ 9,800 $ 2,300  
Other Deferred Compensation Arrangements, Liability, Classified, Noncurrent $ 20,500   $ 20,500   $ 22,800