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Business Combinations and Asset Acquisitions (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Asset Acquisition [Line Items]    
Business Combination, Provisional Information, Initial Accounting Incomplete, Reasons   The estimated fair values of assets acquired and liabilities assumed were based on preliminary calculations and valuations using estimates and assumptions at the time of acquisition. As the Company obtained additional information during the measurement period (not exceeding one year from the acquisition date), it recorded adjustments to its preliminary estimates of fair value, as described above. As of September 30, 2023, the Company expects that additional adjustments to the fair value of certain tax balances will be necessary.
Goodwill, Purchase Accounting Adjustments   $ 0.7
Rahi Systems    
Asset Acquisition [Line Items]    
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual $ 131.1 $ 417.6
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   0.7
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets   2.9
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities   1.7
us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredIncomeTaxes   $ (6.5)