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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2022
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,
| 2022 |  | 2021 |  | 2020
Risk free interest rate | 2.0% |  | 0.8% |  | 1.4%
Expected life (in years) | 7 |  | 7 |  | 5
Expected volatility | 43% |  | 41% |  | 30%
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,
| 2022 |  | 2021 |  | 2020
| Awards |  | Weighted-Average Fair Value |  | Awards |  | Weighted-Average Fair Value |  | Awards |  | Weighted-Average Fair Value
Unvested at beginning of year | 974,162 |  |  | $ | 53.48 |  |  | 921,495 |  |  | $ | 43.15 |  |  | 363,729 |  |  | $ | 60.00 |
Granted | 234,800 |  |  | 122.13 |  |  | 314,480 |  |  | 77.81 |  |  | 656,717 |  |  | 37.44 |
Vested | (393,194) |  |  | 53.13 |  |  | (232,152) |  |  | 44.10 |  |  | (83,253) |  |  | 69.17 |
Forfeited | (41,535) |  |  | 66.30 |  |  | (29,661) |  |  | 63.86 |  |  | (15,698) |  |  | 56.79 |
Unvested at end of year | 774,233 |  |  | $ | 73.79 |  |  | 974,162 |  |  | $ | 53.48 |  |  | 921,495 |  |  | $ | 43.15 |
The following table sets forth a summary of performance-based awards and related information for the periods presented:
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
| Awards |  | Weighted-Average Fair Value |  | Awards |  | Weighted-Average Fair Value |  | Awards |  | Weighted-Average Fair Value
Unvested at beginning of year | 380,819 |  |  | $ | 59.23 |  |  | 305,269 |  |  | $ | 52.61 |  |  | 195,305 |  |  | $ | 60.24 |
Granted | 83,991 |  |  | 122.09 |  |  | 122,812 |  |  | 76.76 |  |  | 158,756 |  |  | 49.56 |
Vested | (115,394) |  |  | 54.64 |  |  | (22,371) |  |  | 62.80 |  |  | (25,909) |  |  | 78.04 |
Forfeited | (14,087) |  |  | 60.75 |  |  | (24,891) |  |  | 61.26 |  |  | (22,883) |  |  | 69.39 |
Unvested at end of year | 335,329 |  |  | $ | 75.26 |  |  | 380,819 |  |  | $ | 59.23 |  |  | 305,269 |  |  | $ | 52.61 |
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, 2022, 2021 and 2020, 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,
| 2022 |  | 2021 |  | 2020
Stock options granted | 92,799 |  |  | — |  |  | — |
Weighted-average fair value | $ | 57.15 |  |  | n/a |  | n/a
Stock-settled stock appreciation rights granted | — |  |  | 139,592 |  |  | 262,091 |
Weighted-average fair value | n/a |  | $ | 33.19 |  |  | $ | 13.86 |
Restricted stock units granted | 234,800 |  |  | 314,480 |  |  | 656,717 |
Weighted-average fair value | $ | 122.13 |  |  | $ | 77.81 |  |  | $ | 37.44 |
Performance-based awards granted | 83,991 |  |  | 122,812 |  |  | 158,756 |
Weighted-average fair value | $ | 122.09 |  |  | $ | 76.76 |  |  | $ | 49.56 |
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,
| 2022 |  | 2021 |  | 2020
| Awards |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Life |  | Aggregate Intrinsic Value (In thousands) |  | Awards |  | Weighted-Average Exercise Price |  | Awards |  | Weighted-Average Exercise Price
Beginning of year | 1,370,388 |  |  | $ | 62.09 |  |  |  |  |  |  | 2,161,556 |  |  | $ | 60.48 |  |  | 2,337,049 |  |  | $ | 59.72 |
Granted | — |  |  | — |  |  |  |  |  |  | 139,592 |  |  | 77.05 |  |  | 262,091 |  |  | 48.32 |
Exercised | (113,382) |  |  | 61.90 |  |  |  |  |  |  | (916,906) |  |  | 60.70 |  |  | (391,339) |  |  | 47.11 |
Forfeited | (8,891) |  |  | 73.35 |  |  |  |  |  |  | (13,854) |  |  | 54.42 |  |  | (46,245) |  |  | 65.93 |
End of year | 1,248,115 |  |  | 62.02 |  |  | 5.2 |  | $ | 78,850 |  |  | 1,370,388 |  |  | 62.09 |  |  | 2,161,556 |  |  | 60.48 |
Exercisable at end of year | 1,083,320 |  |  | $ | 61.91 |  |  | 4.9 |  | $ | 68,567 |  |  | 1,001,708 |  |  | $ | 62.79 |  |  | 1,630,891 |  |  | $ | 62.72 |
Share-Based Payment Arrangement, Option, Activity | The following table sets forth a summary of stock options and related information for the period presented:
| Year Ended December 31,
| 2022
| Awards |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Life |  | Aggregate Intrinsic Value (In thousands)
Beginning of year | — |  |  | $ | — |  |  |  |  |
Granted | 92,799 |  |  | 121.58 |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  |
Forfeited | (5,452) |  |  | 122.09 |  |  |  |  |
End of year | 87,347 |  |  | 121.55 |  |  | 9.1 |  | $ | 319 |
Exercisable at end of year | 879 |  |  | $ | 122.09 |  |  | 0.6 |  | $ | 3 |

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