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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2024

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 months ended March 31, 2024 and 2023, Wesco granted the following stock options, restricted stock units, and performance-based awards at the following weighted-average fair values:

									Three Months Ended
															March 31, 2024						March 31, 2023
Stock options granted															85,425						75,182
Weighted-average fair value															$	72.05					$	76.77
Restricted stock units granted															202,299						170,569
Weighted-average fair value															$	152.10					$	171.03
Performance-based awards granted(1)															192,995						208,371
Weighted-average fair value(1)															$	108.72					$	85.94

(1)    As described further below, the three months ended March 31, 2024 includes performance-based awards granted in February 2021 for which actual achievement levels were certified in February 2024, as well as performance-based awards granted during the three months ended March 31, 2024.

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 three months ended March 31, 2024:

			Awards						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Term (In years)						Aggregate Intrinsic Value (In millions)
Outstanding at December 31, 2023			818,284						$	59.55
Granted			—						—
Exercised			(26,413)						63.82
Forfeited			(244)						85.35
Outstanding at March 31, 2024			791,627						$	59.40					4.8						$	88.6
Exercisable at March 31, 2024			790,495						$	59.37					4.8						$	88.5

For the three months ended March 31, 2024, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $2.8 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 three months ended March 31, 2024:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2023			407,613						$	127.49
Granted			202,299						152.10
Vested			(184,135)						116.57
Forfeited			(17,621)						138.41
Unvested at March 31, 2024			408,156						$	144.03

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 three months ended March 31, 2024:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2023			254,859						$	115.15
Granted(1)			192,995						108.72
Vested			(223,042)						77.08
Forfeited			(4,226)						159.15
Unvested at March 31, 2024			220,586						$	147.18

(1)    Includes 80,951 performance-based awards granted in February 2024 with a fair value of $152.07 and three-year performance period ending December 31, 2026, and 111,521 of additional performance-based awards related to awards originally granted in February 2021 with a fair value of $77.08 and three-year performance period ended December 31, 2023 for which actual achievement levels were certified in February 2024.

Share-Based Payment Arrangement, Option, Activity

The following table sets forth a summary of stock options and related information for the three months ended March 31, 2024:

			Awards						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Term (In years)						Aggregate Intrinsic Value (In millions)
Outstanding at December 31, 2023			163,082						$	144.51
Granted			85,425						152.07
Exercised			(2,326)						122.09
Forfeited			(4,327)						155.67
Outstanding at March 31, 2024			241,854						$	147.20					8.9						$	5.9
Exercisable at March 31, 2024			77,608						$	136.81					8.2						$	2.7

For the three months ended March 31, 2024, 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
															March 31, 2024						March 31, 2023
Risk free interest rate															4.2		%				4.1		%
Expected life (in years)															5						5
Expected volatility															55		%				50		%
Expected dividend yield															1.09		%				0.88		%

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