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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

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

			Year Ended December 31,
			2022						2021						2020
Risk free interest rate			2.0%						0.8%						1.4%
Expected life (in years)			7						7						5
Expected volatility			43%						41%						30%

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

The following table sets forth a summary of restricted stock units and related information for the periods presented:

			Year Ended December 31,
			2022												2021												2020
			Awards						Weighted-Average Fair Value						Awards						Weighted-Average Fair Value						Awards						Weighted-Average Fair Value
Unvested at beginning of year			974,162						$	53.48					921,495						$	43.15					363,729						$	60.00
Granted			234,800						122.13						314,480						77.81						656,717						37.44
Vested			(393,194)						53.13						(232,152)						44.10						(83,253)						69.17
Forfeited			(41,535)						66.30						(29,661)						63.86						(15,698)						56.79
Unvested at end of year			774,233						$	73.79					974,162						$	53.48					921,495						$	43.15

The following table sets forth a summary of performance-based awards and related information for the periods presented:

			Year Ended December 31,
			2022												2021												2020
			Awards						Weighted-Average Fair Value						Awards						Weighted-Average Fair Value						Awards						Weighted-Average Fair Value
Unvested at beginning of year			380,819						$	59.23					305,269						$	52.61					195,305						$	60.24
Granted			83,991						122.09						122,812						76.76						158,756						49.56
Vested			(115,394)						54.64						(22,371)						62.80						(25,909)						78.04
Forfeited			(14,087)						60.75						(24,891)						61.26						(22,883)						69.39
Unvested at end of year			335,329						$	75.26					380,819						$	59.23					305,269						$	52.61

Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

During the years ended December 31, 2022, 2021 and 2020, 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:

			Year Ended December 31,
			2022						2021						2020
Stock options granted			92,799						—						—
Weighted-average fair value			$	57.15					n/a						n/a
Stock-settled stock appreciation rights granted			—						139,592						262,091
Weighted-average fair value			n/a						$	33.19					$	13.86
Restricted stock units granted			234,800						314,480						656,717
Weighted-average fair value			$	122.13					$	77.81					$	37.44
Performance-based awards granted			83,991						122,812						158,756
Weighted-average fair value			$	122.09					$	76.76					$	49.56

Share-Based Payment Arrangement, Stock Appreciation Right, Activity

The following table sets forth a summary of stock-settled stock appreciation rights and related information for the periods presented:

			Year Ended December 31,
			2022																								2021												2020
			Awards						Weighted-Average Exercise Price						Weighted-Average Remaining Contractual Life						Aggregate Intrinsic Value (In thousands)						Awards						Weighted-Average Exercise Price						Awards						Weighted-Average Exercise Price
Beginning of year			1,370,388						$	62.09																	2,161,556						$	60.48					2,337,049						$	59.72
Granted			—						—																		139,592						77.05						262,091						48.32
Exercised			(113,382)						61.90																		(916,906)						60.70						(391,339)						47.11
Forfeited			(8,891)						73.35																		(13,854)						54.42						(46,245)						65.93
End of year			1,248,115						62.02						5.2						$	78,850					1,370,388						62.09						2,161,556						60.48
Exercisable at end of year			1,083,320						$	61.91					4.9						$	68,567					1,001,708						$	62.79					1,630,891						$	62.72

Share-Based Payment Arrangement, Option, Activity

The following table sets forth a summary of stock options and related information for the period presented:

			Year Ended December 31,
			2022
			Awards						Weighted-Average Exercise Price						Weighted-Average Remaining Contractual Life						Aggregate Intrinsic Value (In thousands)
Beginning of year			—						$	—
Granted			92,799						121.58
Exercised			—						—
Forfeited			(5,452)						122.09
End of year			87,347						121.55						9.1						$	319
Exercisable at end of year			879						$	122.09					0.6						$	3

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year.

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