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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 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 and nine months ended September 30, 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												Nine Months Ended
			September 30, 2025						September 30, 2024						September 30, 2025						September 30, 2024
Stock options granted			—						—						89,221						85,425
Weighted-average fair value			n/a						n/a						$	76.72					$	72.05
Restricted stock units granted			17,722						1,942						240,469						240,233
Weighted-average fair value			$	215.18					$	150.44					$	181.98					$	157.13
Performance-based awards granted			425						540						77,289						194,105
Weighted-average fair value			$	171.90					$	147.26					$	191.75					$	108.94

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, 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			(270,651)						58.86
Forfeited			—						—
Outstanding at September 30, 2025			428,393						$	58.93					3.8						$	65.4
Exercisable at September 30, 2025			428,393						$	58.93					3.8						$	65.4

For the nine months ended September 30, 2025, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $43.3 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, 2025:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2024			427,570						$	149.84
Granted			240,469						181.98
Vested			(168,679)						145.67
Forfeited			(38,282)						176.34
Unvested at September 30, 2025			461,078						$	165.79

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, 2025:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2024			214,517						$	147.19
Granted			77,289						191.75
Vested			(75,189)						122.09
Forfeited			(22,379)						172.54
Unvested at September 30, 2025			194,238						$	171.72

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, 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			89,221						180.72
Exercised			(14,256)						141.78
Forfeited			(19,805)						169.76
Outstanding at September 30, 2025			289,974						$	156.14					7.7						$	16.1
Exercisable at September 30, 2025			144,986						$	142.30					6.5						$	10.0

For the nine months ended September 30, 2025, the aggregate intrinsic value of stock options exercised during such period was $0.9 million.

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, 2025						September 30, 2024						September 30, 2025						September 30, 2024
Risk free interest rate			n/a						n/a						4.1		%				4.2		%
Expected life (in years)			n/a						n/a						5						5
Expected volatility			n/a						n/a						47		%				55		%
Expected dividend yield			n/a						n/a						1.01		%				1.09		%

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