Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Net Income	$ 110.5	$ 118.1	$ 326.6	$ 367.5
Other Comprehensive Income (Loss)
Foreign currency translation	2.4	(4.4)	(3.5)	(0.7)
Pension and postretirement benefits liability adjustments (net of tax of $(0.5), $(—), $(1.5) and $(0.2) respectively)	1.4	0.3	4.2	0.7
Total Other Comprehensive Income (Loss)	3.8	(4.1)	0.7
Comprehensive Income	114.3	114.0	327.3	367.5
Less: comprehensive income attributable to noncontrolling interests, net of tax	0.4	0.1	0.8	0.6
Comprehensive Income attributable to Graybar Electric Company, Inc.	$ 113.9	$ 113.9	$ 326.5	$ 366.9