Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Consolidated Statements Of Comprehensive Income [Abstract]
Net Income	$ 263.0	$ 122.1	$ 144.9
Other Comprehensive Income (Loss)
Foreign currency translation	0.1	2.8	4.8
Pension and postretirement benefits liability adjustments (net of tax of $(22.9), $(0.5), and $5.2, respectively)	66.1	1.3	(15.0)
Total Other Comprehensive Income (Loss)	66.2	4.1	(10.2)
Comprehensive Income	329.2	126.2	134.7
Less: comprehensive income attributable to noncontrolling interests, net of tax	0.6	0.5	0.5
Comprehensive Income attributable to Graybar Electric Company, Inc.	$ 328.6	$ 125.7	$ 134.2