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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 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 six months ended June 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 |  | Six Months Ended
| June 30, 2023 |  | June 30, 2022 |  | June 30, 2023 |  | June 30, 2022
Stock options granted | 1,954 |  |  | — |  |  | 77,136 |  |  | 89,550 |
Weighted-average fair value | $ | 76.75 |  |  | $ | — |  |  | $ | 76.77 |  |  | $ | 57.26 |
Restricted stock units granted | 3,295 |  |  | — |  |  | 173,864 |  |  | 224,946 |
Weighted-average fair value | $ | 138.11 |  |  | $ | — |  |  | $ | 170.41 |  |  | $ | 122.11 |
Performance-based awards granted(1) | 3,074 |  |  | — |  |  | 211,445 |  |  | 83,991 |
Weighted-average fair value(1) | $ | 150.32 |  |  | $ | — |  |  | $ | 86.88 |  |  | $ | 122.09 |
(1) As described further below, the six months ended June 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 six months ended June 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 six months ended June 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 | (406,625) |  |  | 66.80 |  |  |  |  |
Forfeited | (638) |  |  | 72.15 |  |  |  |  |
Outstanding at June 30, 2023 | 840,852 |  |  | $ | 59.71 |  |  | 5.5 |  | $ | 100.4 |
Exercisable at June 30, 2023 | 799,354 |  |  | $ | 58.81 |  |  | 5.4 |  | $ | 96.1 |
For the six months ended June 30, 2023, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $37.9 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 six months ended June 30, 2023:
| Awards |  | Weighted- Average Fair Value
Unvested at December 31, 2022 | 774,233 |  |  | $ | 73.79 |
Granted | 173,864 |  |  | 170.41 |
Vested | (336,063) |  |  | 71.74 |
Forfeited | (15,582) |  |  | 121.07 |
Unvested at June 30, 2023 | 596,452 |  |  | $ | 101.88 |
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 six months ended June 30, 2023:
| Awards |  | Weighted- Average Fair Value
Unvested at December 31, 2022 | 335,329 |  |  | $ | 75.26 |
Granted(1) | 211,445 |  |  | 86.88 |
Vested | (289,394) |  |  | 48.32 |
Forfeited | — |  |  | — |
Unvested at June 30, 2023 | 257,380 |  |  | $ | 115.09 |
(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 performance-based awards 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 performance-based awards granted during the three months ended June 30, 2023 with a weighted-average fair value of $150.32 and three-year performance period 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 six months ended June 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 | 77,136 |  |  | 169.99 |  |  |  |  |
Exercised | (1,279) |  |  | 122.09 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Outstanding at June 30, 2023 | 163,204 |  |  | $ | 144.44 |  |  | 9.1 |  | $ | 5.7 |
Exercisable at June 30, 2023 | 27,782 |  |  | $ | 121.89 |  |  | 8.6 |  | $ | 1.6 |
For the six months ended June 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 |  | Six Months Ended
| June 30, 2023 |  | June 30, 2022 |  | June 30, 2023 |  | June 30, 2022
Risk free interest rate | 4.0 | % |  | n/a |  | 4.1 | % |  | 1.9 | %
Expected life (in years) | 5 |  | n/a |  | 5 |  | 7
Expected volatility | 51 | % |  | n/a |  | 50 | % |  | 43 | %
Expected dividend yield | 0.89 | % |  | n/a |  | 0.88 | % |  | n/a

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