CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	$ 529.0	$ 527.3
Accounts Receivable, after Allowance for Credit Loss, Current	3,850.7	3,662.7
Accounts and Other Receivables, Net, Current	380.3	435.7
Inventories, net	3,584.3	3,498.8
Prepaid expenses and other current assets	239.1	206.0
Assets, Current	8,583.4	8,330.5
Property, buildings and equipment, net of accumulated depreciation of $229,041 and $213,758 in 2014 and 2013, respectively	411.3	402.7
Operating Lease, Right-of-Use Asset	681.7	625.1
Intangible assets, net	1,902.0	1,943.4
Goodwill	3,266.6	3,240.9
Other assets	317.7	269.1
Assets	15,162.7	14,811.7
Accounts payable	2,662.7	2,728.2
Accrued payroll and benefit costs	140.6	269.1
Current portion of long-term debt	9.2	70.5
Other Liabilities, Current	769.2	749.5
Liabilities, Current	3,581.7	3,817.3
Total long-term debt	5,523.1	5,346.0
Operating Lease, Liability, Noncurrent	559.3	510.4
Deferred Income Tax Liabilities, Net	477.3	460.7
Other Liabilities, Noncurrent	221.0	227.7
Liabilities	10,362.4	10,362.1
Commitments and Contingencies
Additional capital	2,015.5	2,005.4
Retained earnings	$ 4,093.4	$ 3,795.0
Treasury Stock, Common, Shares	22,211,365	22,115,653
Treasury stock, at cost; 22,211,365 and 22,115,653 shares in 2023 and 2022, respectively	$ (984.5)	$ (969.1)
Accumulated other comprehensive income	(319.5)	(377.7)
Total WESCO International, Inc. stockholders' equity	4,805.6	4,454.3
Noncontrolling interest	(5.3)	(4.7)
Total stockholders’ equity	4,800.3	4,449.6
Liabilities and Equity	$ 15,162.7	$ 14,811.7
Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares outstanding (in shares)	0	0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	$ 0.0	$ 0.0
Series A Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.01
Preferred stock, shares authorized (in shares)	25,000
Preferred stock, shares outstanding (in shares)	21,612
Preferred stock, shares issued (in shares)	21,612	21,612
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	$ 0.0	$ 0.0
Common Stock [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	210,000,000	210,000,000
Common stock, shares, issued (in shares)	69,164,993	68,535,704
Common stock, shares outstanding (in shares)	51,293,059	50,759,482
Common stock	$ 0.7	$ 0.7
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares, issued (in shares)	4,339,431	4,339,431
Common stock, shares outstanding (in shares)	0	0
Common stock	$ 0.0	$ 0.0