Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Net Income	$ 102.4	$ 47.3
Other Comprehensive Income
Foreign currency translation	2.2	1.5
Pension and postretirement benefits liability adjustments (net of tax of $(1.4) and $(2.3), respectively)	4.4	6.6
Total Other Comprehensive Income	6.6	8.1
Comprehensive Income	109.0	55.4
Less: Comprehensive income attributable to noncontrolling interests, net of tax	0.3	0.2
Comprehensive Income attributable to Graybar Electric Company, Inc.	$ 108.7	$ 55.2