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EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 12, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Contribution Plan, Cost |  | $ 20.8 |  | $ 21.5 | $ 39.6 | $ 42.9 |
Pension Cost (Reversal of Cost) |  |  |  |  | 5.5 | 0.0 |
Service cost |  | 0.5 |  | 1.2 | 1.0 | 2.4 |
Interest cost |  | 6.0 |  | 3.5 | 10.3 | 8.9 |
Expected return on plan assets |  | (6.3) |  | (3.6) | (10.1) | (9.0) |
Recognized actuarial gain |  | (0.1) |  | (0.3) | (0.2) | (0.6) |
Net periodic pension cost |  | 0.1 |  | 0.8 | 6.5 | 1.7 |
Pension Cost (Reversal of Cost) |  |  |  |  | 5.5 | 0.0 |
WESCO Defined Contribution |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount |  | 7.3 |  |  |  |  |
Foreign Plan |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year |  | 7.0 |  |  | 7.0 |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | 1.0 |  |  | 3.4 |  |
Pension Cost (Reversal of Cost) |  |  |  |  | 0.0 | 0.0 |
Service cost |  | 0.5 |  | 1.2 | 1.0 | 2.4 |
Interest cost |  | 6.0 |  | 2.9 | 9.3 | 5.7 |
Expected return on plan assets |  | (6.3) |  | (3.0) | (9.8) | (6.0) |
Recognized actuarial gain |  | (0.1) |  | (0.3) | (0.2) | (0.6) |
Net periodic pension cost |  | 0.1 |  | 0.8 | 0.3 | 1.5 |
Pension Cost (Reversal of Cost) |  |  |  |  | 0.0 | 0.0 |
UNITED STATES |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | $ 138.8 |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan |  |  | $ 30.6 |  |  |  |
Excise and Sales Taxes |  | 4.8 |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Other Nonoperating Income (Expense) |  |  |  |
Pension Cost (Reversal of Cost) |  |  |  |  | 5.5 | 0.0 |
Service cost |  | 0.0 |  | 0.0 | 0.0 | 0.0 |
Interest cost |  | 0.0 |  | 0.6 | 1.0 | 3.2 |
Expected return on plan assets |  | 0.0 |  | (0.6) | (0.3) | (3.0) |
Recognized actuarial gain |  | 0.0 |  | 0.0 | 0.0 | 0.0 |
Net periodic pension cost |  | 0.0 |  | 0.0 | 6.2 | 0.2 |
Pension Cost (Reversal of Cost) |  |  |  |  | 5.5 | 0.0 |
Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Other Nonoperating Gains (Losses) |  | (0.4) |  | $ (0.5) | 5.5 | $ (0.7) |
WESCODeferredCompensationPlanMember |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Deferred Compensation Liability, Classified, Noncurrent |  | $ 30.3 |  |  | $ 30.3 |  | $ 27.4

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