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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2023
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, 2023 and 2022, Wesco granted the following stock options, restricted stock units, and performance-based awards at the following weighted-average fair values:
| Three Months Ended |  | Nine Months Ended
| September 30, 2023 |  | September 30, 2022 |  | September 30, 2023 |  | September 30, 2022
Stock options granted | 1,593 |  |  | 3,249 |  |  | 78,729 |  |  | 92,799 |
Weighted-average fair value | $ | 72.57 |  |  | $ | 54.13 |  |  | $ | 76.69 |  |  | $ | 57.15 |
Restricted stock units granted | 1,649 |  |  | 1,669 |  |  | 175,513 |  |  | 226,615 |
Weighted-average fair value | $ | 140.91 |  |  | $ | 112.33 |  |  | $ | 170.13 |  |  | $ | 122.04 |
Performance-based awards granted(1) | 662 |  |  | — |  |  | 212,107 |  |  | 83,991 |
Weighted-average fair value(1) | $ | 115.04 |  |  | $ | — |  |  | $ | 86.97 |  |  | $ | 122.09 |
(1) As described further below, the nine months ended September 30, 2023 includes performance-based awards granted in February 2020 for which actual achievement levels were certified in February 2023, as well as performance-based awards granted during the nine months ended September 30, 2023.
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, 2023:
| Awards |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (In years) |  | Aggregate Intrinsic Value (In millions)
Outstanding at December 31, 2022 | 1,248,115 |  |  | $ | 62.02 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (428,500) |  |  | 66.70 |  |  |  |  |
Forfeited | (1,331) |  |  | 74.57 |  |  |  |  |
Outstanding at September 30, 2023 | 818,284 |  |  | $ | 59.55 |  |  | 5.3 |  | $ | 69.0 |
Exercisable at September 30, 2023 | 777,479 |  |  | $ | 58.64 |  |  | 5.2 |  | $ | 66.2 |
For the nine months ended September 30, 2023, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $40.2 million.
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] | The following table sets forth a summary of restricted stock units and related information for the nine months ended September 30, 2023:
| Awards |  | Weighted- Average Fair Value
Unvested at December 31, 2022 | 774,233 |  |  | $ | 73.79 |
Granted | 175,513 |  |  | 170.13 |
Vested | (505,464) |  |  | 59.43 |
Forfeited | (24,646) |  |  | 122.66 |
Unvested at September 30, 2023 | 419,636 |  |  | $ | 128.51 |
Schedule of Nonvested Performance-based Units Activity [Table Text Block] | The following table sets forth a summary of performance-based awards and related information for the nine months ended September 30, 2023:
| Awards |  | Weighted- Average Fair Value
Unvested at December 31, 2022 | 335,329 |  |  | $ | 75.26 |
Granted(1) | 212,107 |  |  | 86.97 |
Vested | (289,394) |  |  | 48.32 |
Forfeited | (3,732) |  |  | 111.00 |
Unvested at September 30, 2023 | 254,310 |  |  | $ | 115.15 |
(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 and 662 performance-based awards granted during the three months ended June 30, 2023 and September 30, 2023, respectively, with weighted-average fair values of $150.32 and $115.04, respectively, and three-year performance periods ending December 31, 2025.
Share-Based Payment Arrangement, Option, Activity | The following table sets forth a summary of stock options and related information for the nine months ended September 30, 2023:
| Awards |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (In years) |  | Aggregate Intrinsic Value (In millions)
Outstanding at December 31, 2022 | 87,347 |  |  | $ | 121.55 |  |  |  |  |
Granted | 78,729 |  |  | 169.72 |  |  |  |  |
Exercised | (1,279) |  |  | 122.09 |  |  |  |  |
Forfeited | (1,715) |  |  | 148.67 |  |  |  |  |
Outstanding at September 30, 2023 | 163,082 |  |  | $ | 144.51 |  |  | 8.9 |  | $ | 2.0 |
Exercisable at September 30, 2023 | 28,411 |  |  | $ | 121.53 |  |  | 8.4 |  | $ | 0.6 |
For the nine months ended September 30, 2023, the aggregate intrinsic value of stock options exercised during such period was not material.
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 values of stock options, as disclosed in the table above, were estimated using the following weighted-average assumptions in the respective periods:
| Three Months Ended |  | Nine Months Ended
| September 30, 2023 |  | September 30, 2022 |  | September 30, 2023 |  | September 30, 2022
Risk free interest rate | 4.4 | % |  | 2.9 | % |  | 4.1 | % |  | 2.0 | %
Expected life (in years) | 5 |  | 7 |  | 5 |  | 7
Expected volatility | 52 | % |  | 44 | % |  | 50 | % |  | 43 | %
Expected dividend yield | 0.96 | % |  | n/a |  | 0.89 | % |  | n/a

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