Condensed Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Condensed Consolidated Statements Of Income [Abstract]
Net Sales	$ 2,949.8	$ 2,732.7
Cost of merchandise sold	(2,374.8)	(2,184.7)
Gross Margin	575.0	548.0
Selling, general and administrative expenses	(422.3)	(392.6)
Depreciation and amortization	(21.1)	(19.3)
Other operating income, net	6.6	6.6
Income from Operations	138.2	142.7
Non-operating expenses, net	(1.6)	(0.4)
Income before Provision for Income Taxes	136.6	142.3
Provision for income taxes	(35.5)	(36.8)
Net Income	101.1	105.5
Net income attributable to noncontrolling interests	(0.2)	(0.3)
Net Income attributable to Graybar Electric Company, Inc.	$ 100.9	$ 105.2
Net Income attributable to Graybar Electric Company, Inc. per share of Common Stock	$ 3.10	$ 3.24
Cash Dividends per share of Common Stock	$ 0.30	$ 0.30
Average Common Shares Outstanding	32.5	32.4