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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 2022
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 nine months ended September 30, 2022 and 2021, Wesco granted the following stock options, stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted-average fair values:
Three Months EndedNine Months Ended
September 30,
2022		September 30,
2021		September 30,
2022		September 30,
2021
Stock options granted3,249 — 92,799 — 
Weighted-average fair value$54.13 $— $57.15 $— 
Stock-settled stock appreciation rights granted— — — 139,592 
Weighted-average fair value$— $— $— $33.19 
Restricted stock units granted1,669 6,897 226,615 314,480 
Weighted-average fair value$112.33 $108.76 $122.04 $77.81 
Performance-based awards granted— — 83,991 122,812 
Weighted-average fair value$— $— $122.09 $76.76 
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 for the nine months ended September 30, 2022:
AwardsWeighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual Term (In years)		Aggregate
Intrinsic
Value
(In thousands)
Outstanding at December 31, 2021
1,370,388 $62.09   
     Granted— —   
     Exercised(101,076)61.79  
     Forfeited(8,891)73.35   
Outstanding at September 30, 2022
1,260,421 $62.03 5.4$72,283 
Exercisable at September 30, 2022
1,095,626 $61.92 5.1$62,959 
For the nine months ended September 30, 2022, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $7.3 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 for the nine months ended September 30, 2022:
AwardsWeighted-
Average
Fair
Value
Unvested at December 31, 2021
974,162 $53.48 
     Granted226,615 122.04 
     Vested(382,954)53.23 
     Forfeited(35,118)62.58 
Unvested at September 30, 2022
782,705 $73.04 
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
The following table sets forth a summary of performance-based awards for the nine months ended September 30, 2022:
AwardsWeighted-
Average
Fair
Value
Unvested at December 31, 2021
380,819 $59.23 
     Granted83,991 122.09 
     Vested(115,394)54.64 
     Forfeited(14,087)60.75 
Unvested at September 30, 2022
335,329 $75.26 
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 values of stock options and stock-settled stock appreciation rights, as disclosed in the table above, were estimated using the following weighted-average assumptions in the respective periods:
Three Months EndedNine Months Ended
September 30,
2022		September 30,
2021		September 30,
2022		September 30,
2021
Risk free interest rate2.9 %n/a2.0 %0.8 %
Expected life (in years)7n/a77
Expected volatility44 %n/a43 %41 %