STOCK-BASED COMPENSATION (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended			12 Months Ended
STOCK-BASED COMPENSATION (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2025	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2028	Dec. 31, 2027	Dec. 31, 2026
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 8.4	$ 2.7		$ 18.6	$ 12.8
Total unrecognized compensation cost	$ 82.4			$ 82.4
Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 22.1			$ 3.6	$ 22.2	$ 34.5

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

WESCO INTERNATIONAL INC 10-Q