Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Consolidated Statements Of Comprehensive Income [Abstract]
Net Income	$ 424.1	$ 464.4	$ 453.7
Other Comprehensive (Loss) Income
Foreign currency translation	(16.1)	4.0	(9.8)
Pension and postretirement benefits liability adjustments (net of tax of $8.3, $10.1, and $(13.0), respectively)	(24.2)	(29.1)	37.3
Total Other Comprehensive (Loss) Income	(40.3)	(25.1)	27.5
Comprehensive Income	383.8	439.3	481.2
Less: comprehensive income attributable to noncontrolling interests, net of tax	0.5	1.0	0.6
Comprehensive Income attributable to Graybar Electric Company, Inc.	$ 383.3	$ 438.3	$ 480.6