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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2020

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, 2020 and 2019, 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, 2020						September 30, 2019						September 30, 2020						September 30, 2019
Stock-settled stock appreciation rights granted			—						—						262,091						213,618
Weighted-average fair value			$	—					$	—					$	13.86					$	16.36
Restricted stock units granted			444,375						6,256						655,825						181,800
Weighted-average fair value			$	32.18					$	47.95					$	37.38					$	54.41
Performance-based awards granted			—						—						158,756						126,874
Weighted-average fair value			$	—					$	—					$	48.67					$	54.64

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, 2020:

			Awards						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Term (In years)						Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2019			2,337,049						$	59.72
Granted			262,091						48.32
Exercised			(182,487)						33.57
Forfeited			(39,112)						65.57
Outstanding at September 30, 2020			2,377,541						60.37						5.7						$	679
Exercisable at September 30, 2020			1,844,929						$	62.32					5.0						$	679

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, 2020:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2019			363,729						$	60.00
Granted			655,825						37.38
Vested			(80,486)						69.68
Forfeited			(8,364)						60.03
Unvested at September 30, 2020			930,704						$	43.23

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, 2020:

			Awards						Weighted- Average Fair Value
Unvested at December 31, 2019			195,305						$	60.24
Granted			158,756						48.67
Vested			(25,909)						78.04
Forfeited			(20,538)						71.47
Unvested at September 30, 2020			307,614						$	52.60

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												Nine Months Ended
			September 30, 2020						September 30, 2019						September 30, 2020						September 30, 2019
Risk free interest rate			n/a						n/a						1.4		%				2.5		%
Expected life (in years)			n/a						n/a						5						5
Expected volatility			n/a						n/a						30		%				29		%

X

- Definition

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

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