Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Net Income	$ 119.6	$ 110.5	$ 359.1	$ 326.6
Other Comprehensive (Loss) Income
Foreign currency translation	(4.3)	2.4	6.6	(3.5)
Pension and postretirement benefits liability adjustments (net of tax of $(0.7), $(0.5), $(1.9) and $(1.5) respectively)	1.8	1.4	5.5	4.2
Total Other Comprehensive (Loss) Income	(2.5)	3.8	12.1	0.7
Comprehensive Income	117.1	114.3	371.2	327.3
Less: Comprehensive income attributable to noncontrolling interests, net of tax	0.2	0.4	1.1	0.8
Comprehensive Income attributable to Graybar Electric Company, Inc.	$ 116.9	$ 113.9	$ 370.1	$ 326.5