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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 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 months ended March 31, 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
|  |  |  |  | March 31, 2023 |  | March 31, 2022
Stock options granted |  |  |  |  | 75,182 |  |  | 89,550 |
Weighted-average fair value |  |  |  |  | $ | 76.77 |  |  | $ | 57.26 |
Restricted stock units granted |  |  |  |  | 170,569 |  |  | 224,946 |
Weighted-average fair value |  |  |  |  | $ | 171.03 |  |  | $ | 122.11 |
Performance-based awards granted(1) |  |  |  |  | 208,371 |  |  | 83,991 |
Weighted-average fair value(1) |  |  |  |  | $ | 85.94 |  |  | $ | 122.09 |
(1) As described further below, the three months ended March 31, 2023 includes performance-based awards granted in February 2020 for which actual achievement levels were certified in February 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 three months ended March 31, 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 | (339,649) |  |  | 68.51 |  |  |  |  |
Forfeited | (638) |  |  | 72.15 |  |  |  |  |
Outstanding at March 31, 2023 | 907,828 |  |  | $ | 59.59 |  |  | 5.6 |  | $ | 86.2 |
Exercisable at March 31, 2023 | 865,198 |  |  | $ | 58.72 |  |  | 5.5 |  | $ | 82.9 |
For the three months ended March 31, 2023, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $31.6 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 three months ended March 31, 2023:
| Awards |  | Weighted- Average Fair Value
Unvested at December 31, 2022 | 774,233 |  |  | $ | 73.79 |
Granted | 170,569 |  |  | 171.03 |
Vested | (323,156) |  |  | 72.05 |
Forfeited | (184) |  |  | 102.64 |
Unvested at March 31, 2023 | 621,462 |  |  | $ | 101.38 |
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 three months ended March 31, 2023:
| Awards |  | Weighted- Average Fair Value
Unvested at December 31, 2022 | 335,329 |  |  | $ | 75.26 |
Granted(1) | 208,371 |  |  | 85.94 |
Vested | (289,394) |  |  | 48.32 |
Forfeited | — |  |  | — |
Unvested at March 31, 2023 | 254,306 |  |  | $ | 114.66 |
(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.
Share-Based Payment Arrangement, Option, Activity | The following table sets forth a summary of stock options and related information for the three months ended March 31, 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 | 75,182 |  |  | 170.04 |  |  |  |  |
Exercised | (1,279) |  |  | 122.09 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Outstanding at March 31, 2023 | 161,250 |  |  | $ | 144.15 |  |  | 9.4 |  | $ | 2.9 |
Exercisable at March 31, 2023 | 27,329 |  |  | $ | 122.09 |  |  | 8.9 |  | $ | 0.9 |
For the three months ended March 31, 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
|  |  |  |  | March 31, 2023 |  | March 31, 2022
Risk free interest rate |  |  |  |  | 4.1 | % |  | 1.9 | %
Expected life (in years) |  |  |  |  | 5 |  | 7
Expected volatility |  |  |  |  | 50 | % |  | 43 | %
Expected dividend yield |  |  |  |  | 0.88 | % |  | n/a

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