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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2021

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, 2021 and 2020, WESCO granted the following stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted-average fair values:

			Three Months Ended												Nine Months Ended
			September 30, 2021						September 30, 2020						September 30, 2021						September 30, 2020
Stock-settled stock appreciation rights granted			—						—						139,592						262,091
Weighted-average fair value			$	—					$	—					$	33.19					$	13.86
Restricted stock units granted			6,897						444,375						314,480						655,825
Weighted-average fair value			$	108.76					$	32.18					$	77.81					$	37.38
Performance-based awards granted			—						—						122,812						158,756
Weighted-average fair value			$	—					$	—					$	76.76					$	48.67

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, 2021:

			Awards						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Term (In years)						Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2020			2,161,556						$	60.48
Granted			139,592						77.05
Exercised			(671,272)						55.93
Forfeited			(12,719)						52.57
Outstanding at September 30, 2021			1,617,157						63.87						5.7						$	83,206
Exercisable at September 30, 2021			1,247,342						$	64.94					4.9						$	62,835

For the nine months ended September 30, 2021, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $31.0 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 and related information for the nine months ended September 30, 2021:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2020			921,495						$	43.15
Granted			314,480						77.81
Vested			(228,584)						44.02
Forfeited			(30,182)						62.68
Unvested at September 30, 2021			977,209						$	53.41

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

The following table sets forth a summary of performance-based awards for the nine months ended September 30, 2021:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2020			305,269						$	52.61
Granted			122,812						76.76
Vested			(22,371)						62.34
Forfeited			(27,802)						59.87
Unvested at September 30, 2021			377,908						$	59.35

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-settled stock appreciation rights was estimated using the following weighted-average assumptions:

									Nine Months Ended
															September 30, 2021						September 30, 2020
Risk free interest rate															0.8		%				1.4		%
Expected life (in years)															7						5
Expected volatility															41		%				30		%

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