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Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting [Abstract]
Revenues	$ 2,086,706	$ 2,150,088	$ 4,055,353	$ 4,111,355
Operating Income (Loss)	15,270	97,950	76,183	168,675
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	2,086,706	2,150,088	4,055,353	4,111,355
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	15,270	97,950	76,183	168,675
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	11,732,014		11,732,014		$ 5,017,635
WESCO
Segment Reporting [Abstract]
Revenues	1,864,849	2,150,088	3,833,496	4,111,355
Operating Income (Loss)	(3,097)	97,950	57,816	168,675
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,864,849	2,150,088	3,833,496	4,111,355
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	(3,097)	97,950	57,816	168,675
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,937,973		4,937,973		5,017,635
Anixter International
Segment Reporting [Abstract]
Revenues	221,857	0	221,857	0
Operating Income (Loss)	18,367	0	18,367	0
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	221,857	0	221,857	0
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	18,367	$ 0	18,367	$ 0
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 6,794,041		$ 6,794,041		$ 0

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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