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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The fair values of stock options and stock-settled stock appreciation rights, as disclosed in the table above, were estimated using the following weighted-average assumptions in the respective periods:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Risk free interest rate | 4.1% |  | 2.0% |  | 0.8%
Expected life (in years) | 5 |  | 7 |  | 7
Expected volatility | 50% |  | 43% |  | 41%
Expected dividend yield | 0.89% |  | n/a |  | n/a
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | The following table sets forth a summary of restricted stock units and related information for the periods presented:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
| Awards |  | Weighted-Average Fair Value |  | Awards |  | Weighted-Average Fair Value |  | Awards |  | Weighted-Average Fair Value
Unvested at beginning of year | 774,233 |  |  | $ | 73.79 |  |  | 974,162 |  |  | $ | 53.48 |  |  | 921,495 |  |  | $ | 43.15 |
Granted | 177,659 |  |  | 169.65 |  |  | 234,800 |  |  | 122.13 |  |  | 314,480 |  |  | 77.81 |
Vested | (508,173) |  |  | 59.72 |  |  | (393,194) |  |  | 53.13 |  |  | (232,152) |  |  | 44.10 |
Forfeited | (36,106) |  |  | 137.28 |  |  | (41,535) |  |  | 66.30 |  |  | (29,661) |  |  | 63.86 |
Unvested at end of year | 407,613 |  |  | $ | 127.49 |  |  | 774,233 |  |  | $ | 73.79 |  |  | 974,162 |  |  | $ | 53.48 |
The following table sets forth a summary of performance-based awards and related information for the periods presented:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
| Awards |  | Weighted-Average Fair Value |  | Awards |  | Weighted-Average Fair Value |  | Awards |  | Weighted-Average Fair Value
Unvested at beginning of year | 335,329 |  |  | $ | 75.26 |  |  | 380,819 |  |  | $ | 59.23 |  |  | 305,269 |  |  | $ | 52.61 |
Granted(1) | 212,656 |  |  | 87.04 |  |  | 83,991 |  |  | 122.09 |  |  | 122,812 |  |  | 76.76 |
Vested | (289,394) |  |  | 48.32 |  |  | (115,394) |  |  | 54.64 |  |  | (22,371) |  |  | 62.80 |
Forfeited | (3,732) |  |  | 111.00 |  |  | (14,087) |  |  | 60.75 |  |  | (24,891) |  |  | 61.26 |
Unvested at end of year | 254,859 |  |  | $ | 115.15 |  |  | 335,329 |  |  | $ | 75.26 |  |  | 380,819 |  |  | $ | 59.23 |
(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, 662, and 549 performance-based awards granted during the three months ended June 30, 2023, September 30, 2023, and December 31, 2023, respectively, with weighted-average fair values of $150.32, $115.04, and $115.21, respectively, and three-year performance periods ending December 31, 2025.
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | During the years ended December 31, 2023, 2022 and 2021, Wesco granted the following stock options, stock-settled stock appreciation rights, restricted stock units, and performance-based awards at the following weighted-average fair values:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Stock options granted | 78,729 |  |  | 92,799 |  |  | — |
Weighted-average fair value | $ | 76.69 |  |  | $ | 57.15 |  |  | n/a
Stock-settled stock appreciation rights granted | — |  |  | — |  |  | 139,592 |
Weighted-average fair value | n/a |  | n/a |  | $ | 33.19 |
Restricted stock units granted | 177,659 |  |  | 234,800 |  |  | 314,480 |
Weighted-average fair value | $ | 169.65 |  |  | $ | 122.13 |  |  | $ | 77.81 |
Performance-based awards granted(1) | 212,656 |  |  | 83,991 |  |  | 122,812 |
Weighted-average fair value(1) | $ | 87.04 |  |  | $ | 122.09 |  |  | $ | 76.76 |
Share-Based Payment Arrangement, Stock Appreciation Right, Activity | The following table sets forth a summary of stock-settled stock appreciation rights and related information for the periods presented:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
| Awards |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Life (In years) |  | Aggregate Intrinsic Value (In millions) |  | Awards |  | Weighted-Average Exercise Price |  | Awards |  | Weighted-Average Exercise Price
Beginning of year | 1,248,115 |  |  | $ | 62.02 |  |  |  |  |  |  | 1,370,388 |  |  | $ | 62.09 |  |  | 2,161,556 |  |  | $ | 60.48 |
Granted | — |  |  | — |  |  |  |  |  |  | — |  |  | — |  |  | 139,592 |  |  | 77.05 |
Exercised | (428,500) |  |  | 66.70 |  |  |  |  |  |  | (113,382) |  |  | 61.90 |  |  | (916,906) |  |  | 60.70 |
Forfeited | (1,331) |  |  | 74.57 |  |  |  |  |  |  | (8,891) |  |  | 73.35 |  |  | (13,854) |  |  | 54.42 |
End of year | 818,284 |  |  | 59.55 |  |  | 5.0 |  | $ | 93.6 |  |  | 1,248,115 |  |  | 62.02 |  |  | 1,370,388 |  |  | 62.09 |
Exercisable at end of year | 777,479 |  |  | $ | 58.64 |  |  | 4.9 |  | $ | 89.6 |  |  | 1,083,320 |  |  | $ | 61.91 |  |  | 1,001,708 |  |  | $ | 62.79 |
For the year ended December 31, 2023, the aggregate intrinsic value of stock-settled appreciation rights exercised during such period was $40.2 million.
Share-Based Payment Arrangement, Option, Activity | The following table sets forth a summary of stock options and related information for the periods presented:
| Year Ended December 31,
| 2023 |  | 2022
| Awards |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Life (In years) |  | Aggregate Intrinsic Value (In millions) |  | Awards |  | Weighted-Average Exercise Price
Beginning of year | 87,347 |  |  | $ | 121.55 |  |  |  |  |  |  | — |  |  | $ | — |
Granted | 78,729 |  |  | 169.72 |  |  |  |  |  |  | 92,799 |  |  | 121.58 |
Exercised | (1,279) |  |  | 122.09 |  |  |  |  |  |  | — |  |  | — |
Forfeited | (1,715) |  |  | 148.67 |  |  |  |  |  |  | (5,452) |  |  | 122.09 |
End of year | 163,082 |  |  | 144.51 |  |  | 8.6 |  | $ | 4.8 |  |  | 87,347 |  |  | 121.55 |
Exercisable at end of year | 28,411 |  |  | $ | 121.53 |  |  | 8.1 |  | $ | 1.5 |  |  | 879 |  |  | $ | 122.09 |

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