Consolidated Statements Of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Consolidated Statements Of Income [Abstract]
Net sales	$ 8,767.3	$ 7,265.7	$ 7,523.9
Cost of merchandise sold	(7,078.1)	(5,896.2)	(6,094.9)
Gross Margin	1,689.2	1,369.5	1,429.0
Selling, general and administrative expenses	(1,240.5)	(1,098.9)	(1,159.9)
Depreciation and amortization	(49.8)	(52.8)	(50.5)
Other income, net	11.5	7.0	5.0
Income from Operations	410.4	224.8	223.6
Non-operating expenses	(59.5)	(58.5)	(23.7)
Income before Provision for Income Taxes	350.9	166.3	199.9
Provision for income taxes	(87.9)	(44.2)	(55.0)
Net Income	263.0	122.1	144.9
Net income attributable to noncontrolling interests	(0.6)	(0.3)	(0.4)
Net Income attributable to Graybar Electric Company, Inc.	$ 262.4	$ 121.8	$ 144.5
Net Income attributable to Graybar Electric Company, Inc. per share of Common Stock	$ 11.51	$ 5.38	$ 6.41