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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 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
			March 31, 2021						March 31, 2020
Stock-settled stock appreciation rights granted			136,194						262,091
Weighted-average fair value			$	33.05					$	13.86
Restricted stock units granted			300,722						211,450
Weighted-average fair value			$	76.89					$	48.32
Performance-based awards granted			119,792						158,756
Weighted-average fair value			$	76.50					$	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 three months ended March 31, 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			136,194						76.80
Exercised			(186,055)						60.92
Forfeited			(12,719)						52.57
Outstanding at March 31, 2021			2,098,976						61.55						5.9						$	52,427
Exercisable at March 31, 2021			1,729,195						$	61.89					5.2						$	42,612

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 three months ended March 31, 2021:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2020			921,495						$	43.15
Granted			300,722						76.89
Vested			(90,178)						60.66
Forfeited			(16,129)						54.57
Unvested at March 31, 2021			1,115,910						$	50.66

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, 2021:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2020			305,269						$	52.61
Granted			119,792						76.50
Vested			(22,371)						62.80
Forfeited			(27,802)						59.87
Unvested at March 31, 2021			374,888						$	59.13

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:

			Three Months Ended
			March 31, 2021						March 31, 2020
Risk free interest rate			0.8		%				1.4		%
Expected life (in years)			7						5
Expected volatility			41		%				30		%

X

- Definition

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

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