Compensation Related Costs, Postemployment Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Defined Contribution Plan Disclosure [Line Items]
Service cost	$ 2,116	$ 4,079	$ 4,271	$ 8,067
Interest cost	4,341	4,455	8,735	9,037
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	7,671	8,692	15,445	17,447
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	183	(106)	368	(207)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(1,397)	(71)	(2,807)	(155)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer			8,000
WESCODeferredCompensationPlanMember
Defined Contribution Plan Disclosure [Line Items]
Deferred Compensation Liability, Classified, Noncurrent	20,100		20,100		$ 20,900
Pension Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other Nonoperating Gains (Losses)	(3,500)	(4,200)	(7,100)	(8,200)
UNITED STATES
Defined Contribution Plan Disclosure [Line Items]
Service cost	0	763	0	1,527
Interest cost	2,083	1,941	4,166	4,077
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	3,497	4,327	6,994	8,827
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(1,414)	(1,642)	(2,828)	(3,242)
Foreign Plan
Defined Contribution Plan Disclosure [Line Items]
Service cost	2,116	3,316	4,271	6,540
Interest cost	2,258	2,514	4,569	4,960
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	4,174	4,365	8,451	8,620
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	183	(106)	368	(207)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	17	1,571	$ 21	3,087
U.S. Defined Contribution Plan Merger | Defined Benefit Contribution Plan Initial Percent Of Employer Match Member
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			100.00%
Defined Contribution Plan Employer Matching Contribution Percent			3.00%
U.S. Defined Contribution Plan Merger | Defined Benefit Contribution Plan Additional Percent Of Employer Match
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			50.00%
Defined Contribution Plan Employer Matching Contribution Percent			4.00%
Wesco Canadian Defined Contribution Plan
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent			5.00%
Wesco Canadian Defined Contribution Plan | Defined Benefit Contribution Plan Initial Percent Of Employer Match Member
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan Employer Matching Contribution Percent			3.00%
Wesco Canadian Defined Contribution Plan | Defined Benefit Contribution Plan Additional Percent Of Employer Match
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			50.00%
Defined Contribution Plan Employer Matching Contribution Percent			4.00%
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Share-based Payment Arrangement, Expense	(400)	$ 600	$ (200)	$ 6,300
Other Deferred Compensation Arrangements, Liability, Classified, Noncurrent	$ 9,100		$ 9,100		$ 22,700