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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2023
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, 2023 and 2022, Wesco granted the following stock options, restricted stock units, and performance-based awards at the following weighted-average fair values:
Three Months EndedSix Months Ended
June 30,
2023		June 30,
2022		June 30,
2023		June 30,
2022
Stock options granted1,954 — 77,136 89,550 
Weighted-average fair value$76.75 $— $76.77 $57.26 
Restricted stock units granted3,295 — 173,864 224,946 
Weighted-average fair value$138.11 $— $170.41 $122.11 
Performance-based awards granted(1)
3,074 — 211,445 83,991 
Weighted-average fair value(1)
$150.32 $— $86.88 $122.09 
(1)    As described further below, the six months ended June 30, 2023 includes performance-based awards granted in February 2020 for which actual achievement levels were certified in February 2023, as well as performance-based awards granted during the six months ended June 30, 2023.
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, 2023:
AwardsWeighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual Term (In years)		Aggregate
Intrinsic
Value
(In millions)
Outstanding at December 31, 2022
1,248,115 $62.02   
     Granted— —   
     Exercised(406,625)66.80  
     Forfeited(638)72.15   
Outstanding at June 30, 2023
840,852 $59.71 5.5$100.4 
Exercisable at June 30, 2023
799,354 $58.81 5.4$96.1 
For the six months ended June 30, 2023, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $37.9 million.
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
The following table sets forth a summary of restricted stock units and related information for the six months ended June 30, 2023:
AwardsWeighted-
Average
Fair
Value
Unvested at December 31, 2022
774,233 $73.79 
     Granted173,864 170.41 
     Vested(336,063)71.74 
     Forfeited(15,582)121.07 
Unvested at June 30, 2023
596,452 $101.88 
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
The following table sets forth a summary of performance-based awards and related information for the six months ended June 30, 2023:
AwardsWeighted-
Average
Fair
Value
Unvested at December 31, 2022
335,329 $75.26 
     Granted(1)
211,445 86.88 
     Vested(289,394)48.32 
     Forfeited— — 
Unvested at June 30, 2023
257,380 $115.09 
(1)    Includes 63,098 performance-based awards granted in February 2023 with a fair value of $171.96 and three-year performance period ending December 31, 2025, and 144,697 performance-based awards granted in February 2020 with a fair value of $48.32 and three-year performance period ended December 31, 2022 for which actual achievement levels were certified in February 2023. Also includes 3,074 performance-based awards granted during the three months ended June 30, 2023 with a weighted-average fair value of $150.32 and three-year performance period ending December 31, 2025.
Share-Based Payment Arrangement, Option, Activity
The following table sets forth a summary of stock options and related information for the six months ended June 30, 2023:
AwardsWeighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual Term (In years)		Aggregate
Intrinsic
Value
(In millions)
Outstanding at December 31, 2022
87,347 $121.55   
     Granted77,136 169.99   
     Exercised(1,279)122.09  
     Forfeited— —   
Outstanding at June 30, 2023
163,204 $144.44 9.1$5.7 
Exercisable at June 30, 2023
27,782 $121.89 8.6$1.6 
For the six months ended June 30, 2023, the aggregate intrinsic value of stock options exercised during such period was not material.
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, as disclosed in the table above, were estimated using the following weighted-average assumptions in the respective periods:
Three Months EndedSix Months Ended
June 30,
2023		June 30,
2022		June 30,
2023		June 30,
2022
Risk free interest rate4.0 %n/a4.1 %1.9 %
Expected life (in years)5n/a57
Expected volatility51 %n/a50 %43 %
Expected dividend yield0.89 %n/a0.88 %n/a