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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2024

Share-Based Payment Arrangement [Abstract]

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

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

			Year Ended December 31,
			2024						2023						2022
Risk free interest rate			4.2%						4.1%						2.0%
Expected life (in years)			5						5						7
Expected volatility			55%						50%						43%
Expected dividend yield			1.09%						0.89%						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,
			2024												2023												2022
			Awards						Weighted-Average Fair Value						Awards						Weighted-Average Fair Value						Awards						Weighted-Average Fair Value
Unvested at beginning of year			407,613						$	127.49					774,233						$	73.79					974,162						$	53.48
Granted			249,757						158.78						177,659						169.65						234,800						122.13
Vested			(195,578)						115.66						(508,173)						59.72						(393,194)						53.13
Forfeited			(34,222)						141.98						(36,106)						137.28						(41,535)						66.30
Unvested at end of year			427,570						$	149.84					407,613						$	127.49					774,233						$	73.79

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

			Year Ended December 31,
			2024												2023												2022
			Awards						Weighted-Average Fair Value						Awards						Weighted-Average Fair Value						Awards						Weighted-Average Fair Value
Unvested at beginning of year			254,859						$	115.15					335,329						$	75.26					380,819						$	59.23
Granted(1)			194,599						109.04						212,656						87.04						83,991						122.09
Vested			(223,042)						77.08						(289,394)						48.32						(115,394)						54.64
Forfeited			(11,899)						151.11						(3,732)						111.00						(14,087)						60.75
Unvested at end of year			214,517						$	147.19					254,859						$	115.15					335,329						$	75.26

(1)    The year ended December 31, 2024 includes 80,951 performance-based awards granted in February 2024 with a fair value of $152.07 and three-year performance period ending December 31, 2026, and 111,521 of additional performance-based awards related to awards originally granted in February 2021 with a fair value of $77.08 and three-year performance period ended December 31, 2023 for which actual achievement levels were certified in February 2024.

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, 2024, 2023 and 2022, Wesco granted the following stock options, restricted stock units, and performance-based awards at the following weighted-average fair values:

			Year Ended December 31,
			2024						2023						2022
Stock options granted			85,425						78,729						92,799
Weighted-average fair value			$	72.05					$	76.69					$	57.15
Restricted stock units granted			249,757						177,659						234,800
Weighted-average fair value			$	158.78					$	169.65					$	122.13
Performance-based awards granted(1)			194,599						212,656						83,991
Weighted-average fair value(1)			$	109.04					$	87.04					$	122.09

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,
			2024																								2023												2022
			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			818,284						$	59.55																	1,248,115						$	62.02					1,370,388						$	62.09
Granted			—						—																		—						—						—						—
Exercised			(118,513)						63.29																		(428,500)						66.70						(113,382)						61.90
Forfeited			(727)						76.25																		(1,331)						74.57						(8,891)						73.35
End of year			699,044						58.90						4.1						$	85.3					818,284						59.55						1,248,115						62.02
Exercisable at end of year			699,044						$	58.90					4.1						$	85.3					777,479						$	58.64					1,083,320						$	61.91

For the year ended December 31, 2024, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $15.2 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,
			2024																								2023												2022
			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			163,082						$	144.51																	87,347						$	121.55					—						$	—
Granted			85,425						152.07																		78,729						169.72						92,799						121.58
Exercised			(3,495)						128.40																		(1,279)						122.09						—						—
Forfeited			(10,198)						154.32																		(1,715)						148.67						(5,452)						122.09
End of year			234,814						147.08						8.1						$	8.0					163,082						144.51						87,347						121.55
Exercisable at end of year			78,399						$	136.60					7.5						$	3.5					28,411						$	121.53					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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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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