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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2025
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, 2025 and 2024, 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, 2025 |  | March 31, 2024
Stock options granted |  |  |  |  | 84,476 |  |  | 85,425 |
Weighted-average fair value |  |  |  |  | $ | 76.59 |  |  | $ | 72.05 |
Restricted stock units granted |  |  |  |  | 215,603 |  |  | 202,299 |
Weighted-average fair value |  |  |  |  | $ | 179.83 |  |  | $ | 152.10 |
Performance-based awards granted |  |  |  |  | 72,302 |  |  | 192,995 |
Weighted-average fair value |  |  |  |  | $ | 191.72 |  |  | $ | 108.72 |
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, 2025:
| Awards |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (In years) |  | Aggregate Intrinsic Value (In millions)
Outstanding at December 31, 2024 | 699,044 |  |  | $ | 58.90 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (21,909) |  |  | 50.99 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Outstanding at March 31, 2025 | 677,135 |  |  | $ | 59.16 |  |  | 4.0 |  | $ | 65.1 |
Exercisable at March 31, 2025 | 677,135 |  |  | $ | 59.16 |  |  | 4.0 |  | $ | 65.1 |
For the three months ended March 31, 2025, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $2.9 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 three months ended March 31, 2025:
| Awards |  | Weighted- Average Fair Value
Unvested at December 31, 2024 | 427,570 |  |  | $ | 149.84 |
Granted | 215,603 |  |  | 179.83 |
Vested | (166,239) |  |  | 146.04 |
Forfeited | (915) |  |  | 179.29 |
Unvested at March 31, 2025 | 476,019 |  |  | $ | 164.56 |
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, 2025:
| Awards |  | Weighted- Average Fair Value
Unvested at December 31, 2024 | 214,517 |  |  | $ | 147.19 |
Granted | 72,302 |  |  | 191.72 |
Vested | (75,189) |  |  | 122.09 |
Forfeited | — |  |  | — |
Unvested at March 31, 2025 | 211,630 |  |  | $ | 171.32 |
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, 2025:
| Awards |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (In years) |  | Aggregate Intrinsic Value (In millions)
Outstanding at December 31, 2024 | 234,814 |  |  | $ | 147.08 |  |  |  |  |
Granted | 84,476 |  |  | 180.47 |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Outstanding at March 31, 2025 | 319,290 |  |  | $ | 155.91 |  |  | 8.4 |  | $ | 3.1 |
Exercisable at March 31, 2025 | 154,402 |  |  | $ | 141.91 |  |  | 7.6 |  | $ | 2.8 |
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, 2025 |  | March 31, 2024
Risk free interest rate |  |  |  |  | 4.1 | % |  | 4.2 | %
Expected life (in years) |  |  |  |  | 5 |  | 5
Expected volatility |  |  |  |  | 47 | % |  | 55 | %
Expected dividend yield |  |  |  |  | 1.01 | % |  | 1.09 | %

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