CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Gross Profit [Abstract]
Revenues	$ 5,745.5	$ 5,483.5	$ 11,267.4	$ 10,415.7
Cost of goods sold	4,503.1	4,294.1	8,816.5	8,177.2
Operating Expenses [Abstract]
Selling, general and administrative expense	831.7	772.9	1,649.4	1,491.0
Depreciation and amortization	46.9	45.8	91.3	92.8
Income from operations	363.8	370.7	710.2	654.7
Interest Income (Expense), Nonoperating, Net	98.8	68.5	193.8	132.1
Other Nonoperating Income (Expense)	0.8	1.2	10.9	2.3
Income before income taxes	264.2	301.0	505.5	520.3
Provision for income taxes	71.8	79.9	115.9	117.6
Net income	192.4	221.1	389.6	402.7
Net (loss) income attributable to noncontrolling interest	(0.7)	0.4	(0.6)	0.8
Net income attributable to WESCO International, Inc.	193.1	220.7	390.2	401.9
Preferred Stock Dividends, Income Statement Impact	14.4	14.4	28.7	28.7
Net Income (Loss) Available to Common Stockholders, Basic	178.7	206.3	361.5	373.2
Comprehensive Income:
Foreign currency translation adjustment	41.2	(79.4)	58.2	(47.7)
Comprehensive income attributable to WESCO International, Inc.	$ 219.9	$ 126.9	$ 419.7	$ 325.5
Basic (in dollars per share)	$ 3.48	$ 4.07	$ 7.07	$ 7.37
Diluted (in dollars per share)	$ 3.41	$ 3.95	$ 6.90	$ 7.15