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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 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 nine months ended September 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 Ended												Nine Months Ended
			September 30, 2023						September 30, 2022						September 30, 2023						September 30, 2022
Stock options granted			1,593						3,249						78,729						92,799
Weighted-average fair value			$	72.57					$	54.13					$	76.69					$	57.15
Restricted stock units granted			1,649						1,669						175,513						226,615
Weighted-average fair value			$	140.91					$	112.33					$	170.13					$	122.04
Performance-based awards granted(1)			662						—						212,107						83,991
Weighted-average fair value(1)			$	115.04					$	—					$	86.97					$	122.09

(1)    As described further below, the nine months ended September 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 nine months ended September 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 nine months ended September 30, 2023:

			Awards						Weighted- 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			(428,500)						66.70
Forfeited			(1,331)						74.57
Outstanding at September 30, 2023			818,284						$	59.55					5.3						$	69.0
Exercisable at September 30, 2023			777,479						$	58.64					5.2						$	66.2

For the nine months ended September 30, 2023, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $40.2 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 nine months ended September 30, 2023:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2022			774,233						$	73.79
Granted			175,513						170.13
Vested			(505,464)						59.43
Forfeited			(24,646)						122.66
Unvested at September 30, 2023			419,636						$	128.51

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 nine months ended September 30, 2023:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2022			335,329						$	75.26
Granted(1)			212,107						86.97
Vested			(289,394)						48.32
Forfeited			(3,732)						111.00
Unvested at September 30, 2023			254,310						$	115.15

(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 of additional performance-based awards related to awards originally 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 and 662 performance-based awards granted during the three months ended June 30, 2023 and September 30, 2023, respectively, with weighted-average fair values of $150.32 and $115.04, respectively, and three-year performance periods 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 nine months ended September 30, 2023:

			Awards						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Term (In years)						Aggregate Intrinsic Value (In millions)
Outstanding at December 31, 2022			87,347						$	121.55
Granted			78,729						169.72
Exercised			(1,279)						122.09
Forfeited			(1,715)						148.67
Outstanding at September 30, 2023			163,082						$	144.51					8.9						$	2.0
Exercisable at September 30, 2023			28,411						$	121.53					8.4						$	0.6

For the nine months ended September 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 Ended												Nine Months Ended
			September 30, 2023						September 30, 2022						September 30, 2023						September 30, 2022
Risk free interest rate			4.4		%				2.9		%				4.1		%				2.0		%
Expected life (in years)			5						7						5						7
Expected volatility			52		%				44		%				50		%				43		%
Expected dividend yield			0.96		%				n/a						0.89		%				n/a

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