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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2023

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,
			2023						2022						2021
Risk free interest rate			4.1%						2.0%						0.8%
Expected life (in years)			5						7						7
Expected volatility			50%						43%						41%
Expected dividend yield			0.89%						n/a						n/a

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,
			2023												2022												2021
			Awards						Weighted-Average Fair Value						Awards						Weighted-Average Fair Value						Awards						Weighted-Average Fair Value
Unvested at beginning of year			774,233						$	73.79					974,162						$	53.48					921,495						$	43.15
Granted			177,659						169.65						234,800						122.13						314,480						77.81
Vested			(508,173)						59.72						(393,194)						53.13						(232,152)						44.10
Forfeited			(36,106)						137.28						(41,535)						66.30						(29,661)						63.86
Unvested at end of year			407,613						$	127.49					774,233						$	73.79					974,162						$	53.48

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

			Year Ended December 31,
			2023												2022												2021
			Awards						Weighted-Average Fair Value						Awards						Weighted-Average Fair Value						Awards						Weighted-Average Fair Value
Unvested at beginning of year			335,329						$	75.26					380,819						$	59.23					305,269						$	52.61
Granted(1)			212,656						87.04						83,991						122.09						122,812						76.76
Vested			(289,394)						48.32						(115,394)						54.64						(22,371)						62.80
Forfeited			(3,732)						111.00						(14,087)						60.75						(24,891)						61.26
Unvested at end of year			254,859						$	115.15					335,329						$	75.26					380,819						$	59.23

(1)    Includes 63,098 performance-based awards granted in February 2023 with a fair value of $171.96 and three-year performance period ending December 31, 2025, and 144,697 of additional performance-based awards related to awards originally granted in February 2020 with a fair value of $48.32 and three-year performance period ended December 31, 2022 for which actual achievement levels were certified in February 2023. Also includes 3,074, 662, and 549 performance-based awards granted during the three months ended June 30, 2023, September 30, 2023, and December 31, 2023, respectively, with weighted-average fair values of $150.32, $115.04, and $115.21, respectively, and three-year performance periods ending December 31, 2025.

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, 2023, 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:

			Year Ended December 31,
			2023						2022						2021
Stock options granted			78,729						92,799						—
Weighted-average fair value			$	76.69					$	57.15					n/a
Stock-settled stock appreciation rights granted			—						—						139,592
Weighted-average fair value			n/a						n/a						$	33.19
Restricted stock units granted			177,659						234,800						314,480
Weighted-average fair value			$	169.65					$	122.13					$	77.81
Performance-based awards granted(1)			212,656						83,991						122,812
Weighted-average fair value(1)			$	87.04					$	122.09					$	76.76

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,
			2023																								2022												2021
			Awards						Weighted-Average Exercise Price						Weighted-Average Remaining Contractual Life (In years)						Aggregate Intrinsic Value (In millions)						Awards						Weighted-Average Exercise Price						Awards						Weighted-Average Exercise Price
Beginning of year			1,248,115						$	62.02																	1,370,388						$	62.09					2,161,556						$	60.48
Granted			—						—																		—						—						139,592						77.05
Exercised			(428,500)						66.70																		(113,382)						61.90						(916,906)						60.70
Forfeited			(1,331)						74.57																		(8,891)						73.35						(13,854)						54.42
End of year			818,284						59.55						5.0						$	93.6					1,248,115						62.02						1,370,388						62.09
Exercisable at end of year			777,479						$	58.64					4.9						$	89.6					1,083,320						$	61.91					1,001,708						$	62.79

For the year ended December 31, 2023, the aggregate intrinsic value of stock-settled appreciation rights exercised during such period was $40.2 million.

Share-Based Payment Arrangement, Option, Activity

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

			Year Ended December 31,
			2023																								2022
			Awards						Weighted-Average Exercise Price						Weighted-Average Remaining Contractual Life (In years)						Aggregate Intrinsic Value (In millions)						Awards						Weighted-Average Exercise Price
Beginning of year			87,347						$	121.55																	—						$	—
Granted			78,729						169.72																		92,799						121.58
Exercised			(1,279)						122.09																		—						—
Forfeited			(1,715)						148.67																		(5,452)						122.09
End of year			163,082						144.51						8.6						$	4.8					87,347						121.55
Exercisable at end of year			28,411						$	121.53					8.1						$	1.5					879						$	122.09

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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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