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Business Combinations and Asset Acquisitions (Details) - Rahi Systems - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Oct. 31, 2023
Asset Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	$ 108.8	$ 136.3
Business Acquisition, Description of Acquired Entity	Headquartered in Fremont, California, Rahi Systems is a leading provider of global hyperscale data center solutions with over 900 employees in 25 countries.
Business Combination, Reason for Business Combination	Rahi’s expertise with complex information technology projects and global presence strengthen Wesco’s data center solution offerings.
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory			$ 19.6
BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccountsPayable			28.0
Goodwill, Purchase Accounting Adjustments			0.9
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets			6.4
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities			6.1
us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredIncomeTaxes			$ (7.2)

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