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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2024
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, 2024 and 2023, 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, 2024 |  | June 30, 2023 |  | June 30, 2024 |  | June 30, 2023
Stock options granted | — |  |  | 1,954 |  |  | 85,425 |  |  | 77,136 |
Weighted-average fair value | n/a |  | $ | 76.75 |  |  | $ | 72.05 |  |  | $ | 76.77 |
Restricted stock units granted | 35,992 |  |  | 3,295 |  |  | 238,291 |  |  | 173,864 |
Weighted-average fair value | $ | 184.73 |  |  | $ | 138.11 |  |  | $ | 157.19 |  |  | $ | 170.41 |
Performance-based awards granted(1) | 570 |  |  | 3,074 |  |  | 193,565 |  |  | 211,445 |
Weighted-average fair value(1) | $ | 147.40 |  |  | $ | 150.32 |  |  | $ | 108.83 |  |  | $ | 86.88 |
(1) As described further below, the six months ended June 30, 2024 includes performance-based awards granted in February 2021 for which actual achievement levels were certified in February 2024, as well as performance-based awards granted during the six months ended June 30, 2024.
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, 2024:
| Awards |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (In years) |  | Aggregate Intrinsic Value (In millions)
Outstanding at December 31, 2023 | 818,284 |  |  | $ | 59.55 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (41,745) |  |  | 61.64 |  |  |  |  |
Forfeited | (727) |  |  | 76.25 |  |  |  |  |
Outstanding at June 30, 2024 | 775,812 |  |  | $ | 59.43 |  |  | 4.6 |  | $ | 76.9 |
Exercisable at June 30, 2024 | 775,812 |  |  | $ | 59.43 |  |  | 4.6 |  | $ | 76.9 |
For the six months ended June 30, 2024, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $4.6 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 six months ended June 30, 2024:
| Awards |  | Weighted- Average Fair Value
Unvested at December 31, 2023 | 407,613 |  |  | $ | 127.49 |
Granted | 238,291 |  |  | 157.19 |
Vested | (187,821) |  |  | 116.48 |
Forfeited | (19,513) |  |  | 139.94 |
Unvested at June 30, 2024 | 438,570 |  |  | $ | 147.69 |
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, 2024:
| Awards |  | Weighted- Average Fair Value
Unvested at December 31, 2023 | 254,859 |  |  | $ | 115.15 |
Granted(1) | 193,565 |  |  | 108.83 |
Vested | (223,042) |  |  | 77.08 |
Forfeited | (4,226) |  |  | 159.15 |
Unvested at June 30, 2024 | 221,156 |  |  | $ | 147.18 |
(1) 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 Payment Arrangement, Option, Activity | The following table sets forth a summary of stock options and related information for the six months ended June 30, 2024:
| Awards |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (In years) |  | Aggregate Intrinsic Value (In millions)
Outstanding at December 31, 2023 | 163,082 |  |  | $ | 144.51 |  |  |  |  |
Granted | 85,425 |  |  | 152.07 |  |  |  |  |
Exercised | (2,326) |  |  | 122.09 |  |  |  |  |
Forfeited | (4,327) |  |  | 155.67 |  |  |  |  |
Outstanding at June 30, 2024 | 241,854 |  |  | $ | 147.20 |  |  | 8.7 |  | $ | 3.7 |
Exercisable at June 30, 2024 | 78,712 |  |  | $ | 136.91 |  |  | 8.0 |  | $ | 2.0 |
For the six months ended June 30, 2024, 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, 2024 |  | June 30, 2023 |  | June 30, 2024 |  | June 30, 2023
Risk free interest rate | n/a |  | 4.0 | % |  | 4.2 | % |  | 4.1 | %
Expected life (in years) | n/a |  | 5 |  | 5 |  | 5
Expected volatility | n/a |  | 51 | % |  | 55 | % |  | 50 | %
Expected dividend yield | n/a |  | 0.89 | % |  | 1.09 | % |  | 0.88 | %

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