Compensation Related Costs, Postemployment Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Defined Contribution Plan Disclosure [Line Items]
Service cost	$ 2,047	$ 4,015	$ 6,318	$ 12,082
Interest cost	4,257	4,483	12,992	13,520
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	7,514	8,691	22,959	26,139
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	179	(103)	547	(311)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(1,389)	(90)	(4,196)	(245)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer			9,300
WESCODeferredCompensationPlanMember
Defined Contribution Plan Disclosure [Line Items]
Deferred Compensation Liability, Classified, Noncurrent	19,600		19,600		$ 20,900
Pension Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other Nonoperating Gains (Losses)	(3,400)	(4,100)	(10,500)	(12,300)
UNITED STATES
Defined Contribution Plan Disclosure [Line Items]
Service cost	0	764	0	2,291
Interest cost	2,083	2,018	6,250	6,095
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	3,497	4,414	10,491	13,241
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(1,414)	(1,632)	(4,241)	(4,874)
Foreign Plan
Defined Contribution Plan Disclosure [Line Items]
Service cost	2,047	3,251	6,318	9,791
Interest cost	2,174	2,465	6,742	7,425
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	4,017	4,277	12,468	12,898
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	179	(103)	547	(311)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	25	1,542	$ 45	4,629
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	1,800	$ 3,400	$ 1,600	$ 9,800
Other Deferred Compensation Arrangements, Liability, Classified, Noncurrent	$ 7,900		$ 7,900		$ 22,700