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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2022

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, 2022 and 2021, Wesco granted the following stock options, stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted-average fair values:

									Three Months Ended
															March 31, 2022						March 31, 2021
Stock options granted															89,550						—
Weighted-average fair value															$	57.26					$	—
Stock-settled stock appreciation rights granted															—						136,194
Weighted-average fair value															$	—					$	33.05
Restricted stock units granted															224,946						300,722
Weighted-average fair value															$	122.11					$	76.89
Performance-based awards granted															83,991						119,792
Weighted-average fair value															$	122.09					$	76.50

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 for the three months ended March 31, 2022:

			Awards						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Term (In years)						Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2021			1,370,388						$	62.09
Granted			—						—
Exercised			(37,411)						66.32
Forfeited			(1,386)						76.80
Outstanding at March 31, 2022			1,331,591						$	61.95					6.0						$	90,797
Exercisable at March 31, 2022			1,155,912						$	61.73					5.6						$	79,079

For the three months ended March 31, 2022, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $2.4 million.

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

The following table sets forth a summary of time-based restricted stock units for the three months ended March 31, 2022:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2021			974,162						$	53.48
Granted			224,946						122.11
Vested			(232,276)						64.01
Forfeited			(1,092)						106.05
Unvested at March 31, 2022			965,740						$	66.87

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

The following table sets forth a summary of performance-based awards for the three months ended March 31, 2022:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2021			380,819						$	59.23
Granted			83,991						122.09
Vested			(115,394)						54.64
Forfeited			(1,790)						76.80
Unvested at March 31, 2022			347,626						$	73.16

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 value of stock options and stock-settled stock appreciation rights, as disclosed in the table above, was estimated using the following weighted-average assumptions in the respective periods:

									Three Months Ended
															March 31, 2022						March 31, 2021
Risk free interest rate															1.9		%				0.8		%
Expected life (in years)															7						7
Expected volatility															43		%				41		%

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Tabular disclosure of the changes in outstanding nonvested performance-based units.

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