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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Defined Contribution Plan Disclosure [Line Items]          
Assets Held-in-trust $ 39,500   $ 39,500    
Defined Benefit Plan, Plan Assets, Contributions by Employer 2,900   4,700    
Postemployment Benefits, Period Expense     13,600 $ 24,700  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]          
Service cost 3,826 $ 1,158 6,801 3,446  
Interest cost 4,844 1,098 7,170 3,267  
Expected return on plan assets 8,399 1,433 12,001 4,265  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 1 16 (52) 47  
Net periodic benefit cost 270 807 2,022 2,401  
Defined Benefit Plan, Service Cost 3,826 1,158 6,801 3,446  
Defined Benefit Plan, Plan Assets, Contributions by Employer 2,900   4,700    
Postemployment Benefits, Period Expense     13,600 24,700  
Anixter International          
Defined Contribution Plan Disclosure [Line Items]          
Deferred Compensation Liability, Current 3,800   3,800    
Deferred Compensation Liability, Classified, Noncurrent 42,400   42,400    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]          
Deferred Compensation Liability, Current 3,800   3,800    
WESCO          
Defined Contribution Plan Disclosure [Line Items]          
Deferred Compensation Liability, Current 10,100   10,100    
Deferred Compensation Liability, Classified, Noncurrent 15,900   15,900   $ 25,200
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]          
Deferred Compensation Liability, Current 10,100   10,100    
Pension Plan [Member]          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]          
Other Nonoperating Gains (Losses) (3,600) $ (400) $ (4,800) $ (1,000)  
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%    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]          
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent     5.00%    
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%    
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 1,400   $ 2,300    
Other Deferred Compensation Arrangements, Liability, Classified, Noncurrent $ 13,400   $ 13,400