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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
During the three and six months ended June 30, 2021 and 2020, WESCO granted the following stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted-average fair values:

Three Months EndedSix Months Ended
June 30,
2021		June 30,
2020		June 30,
2021		June 30,
2020
Stock-settled stock appreciation rights granted3,398 — 139,592 262,091 
Weighted-average fair value$38.62 $— $33.19 $13.86 
Restricted stock units granted6,861 — 307,583 211,450 
Weighted-average fair value$86.91 $— $77.12 $48.32 
Performance-based awards granted3,020 — 122,812 158,756 
Weighted-average fair value$86.91 $— $76.76 $48.67 
Share-based Payment Arrangement, Option and Stock Appreciation Rights, Activity [Table Text Block]
The following table sets forth a summary of stock-settled stock appreciation rights and related information for the six months ended June 30, 2021:
AwardsWeighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual Term (In years)		Aggregate
Intrinsic
Value
(In thousands)
Outstanding at December 31, 20202,161,556 $60.48   
     Granted139,592 77.05   
     Exercised(558,550)54.65  
     Forfeited(12,719)52.57   
Outstanding at June 30, 2021
1,729,879 63.76 5.9$69,154 
Exercisable at June 30, 2021
1,359,501 $64.73 5.1$53,041 
For the six months ended June 30, 2021, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $24.9 million.
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
The following table sets forth a summary of time-based restricted stock units and related information for the six months ended June 30, 2021:
AwardsWeighted-
Average
Fair
Value
Unvested at December 31, 2020
921,495 $43.15 
     Granted307,583 77.12 
     Vested(226,943)43.89 
     Forfeited(25,134)59.90 
Unvested at June 30, 2021
977,001 $53.23 
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
The following table sets forth a summary of performance-based awards for the six months ended June 30, 2021:
AwardsWeighted-
Average
Fair
Value
Unvested at December 31, 2020
305,269 $52.61 
     Granted122,812 76.76 
     Vested(22,371)62.34 
     Forfeited(27,802)59.87 
Unvested at June 30, 2021
377,908 $59.35 
Stock Appreciation Rights (SARs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of stock-settled stock appreciation rights was estimated using the following weighted-average assumptions:
Three Months EndedSix Months Ended
June 30,
2021		June 30,
2020		June 30,
2021		June 30,
2020
Risk free interest rate1.3 %n/a0.8 %1.4 %
Expected life (in years)7n/a75
Expected volatility42 %n/a41 %30 %