Condensed Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Condensed Consolidated Statements Of Income [Abstract]
Net sales	$ 2,381.8	$ 1,900.5
Cost of merchandise sold	(1,902.5)	(1,539.6)
Gross Margin	479.3	360.9
Selling, general and administrative expenses	(324.0)	(277.9)
Depreciation and amortization	(13.0)	(12.2)
Other income, net	0.9	0.5
Income from Operations	143.2	71.3
Non-operating expenses	(5.5)	(7.8)
Income before Provision for Income Taxes	137.7	63.5
Provision for income taxes	(35.3)	(16.2)
Net Income	102.4	47.3
Net income attributable to noncontrolling interests	(0.2)	(0.1)
Net Income attributable to Graybar Electric Company, Inc.	$ 102.2	$ 47.2
Net Income attributable to Graybar Electric Company, Inc. per share of Common Stock	$ 4.42	$ 2.07
Cash Dividends per share of Common Stock	$ 0.30	$ 0.30
Average Common Shares Outstanding	23.1	22.8