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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2025

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, 2025 and 2024, 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, 2025						March 31, 2024
Stock options granted															84,476						85,425
Weighted-average fair value															$	76.59					$	72.05
Restricted stock units granted															215,603						202,299
Weighted-average fair value															$	179.83					$	152.10
Performance-based awards granted															72,302						192,995
Weighted-average fair value															$	191.72					$	108.72

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, 2025:

			Awards						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Term (In years)						Aggregate Intrinsic Value (In millions)
Outstanding at December 31, 2024			699,044						$	58.90
Granted			—						—
Exercised			(21,909)						50.99
Forfeited			—						—
Outstanding at March 31, 2025			677,135						$	59.16					4.0						$	65.1
Exercisable at March 31, 2025			677,135						$	59.16					4.0						$	65.1

For the three months ended March 31, 2025, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $2.9 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 three months ended March 31, 2025:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2024			427,570						$	149.84
Granted			215,603						179.83
Vested			(166,239)						146.04
Forfeited			(915)						179.29
Unvested at March 31, 2025			476,019						$	164.56

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, 2025:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2024			214,517						$	147.19
Granted			72,302						191.72
Vested			(75,189)						122.09
Forfeited			—						—
Unvested at March 31, 2025			211,630						$	171.32

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, 2025:

			Awards						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Term (In years)						Aggregate Intrinsic Value (In millions)
Outstanding at December 31, 2024			234,814						$	147.08
Granted			84,476						180.47
Exercised			—						—
Forfeited			—						—
Outstanding at March 31, 2025			319,290						$	155.91					8.4						$	3.1
Exercisable at March 31, 2025			154,402						$	141.91					7.6						$	2.8

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, 2025						March 31, 2024
Risk free interest rate															4.1		%				4.2		%
Expected life (in years)															5						5
Expected volatility															47		%				55		%
Expected dividend yield															1.01		%				1.09		%

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