Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Anixter International [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Charged to Other Accounts		$ 59,300
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount		23,909		$ 25,443	$ 24,468		$ 21,313
Valuation Allowances and Reserves, Charged to Cost and Expense		11,701		7,006	10,854
Valuation Allowances and Reserves, Charged to Other Accounts	[1]	5,160		52	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[2]	(18,395)		(6,083)	(7,699)
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount		60,629		5,854	4,072	$ 2,518
Valuation Allowances and Reserves, Charged to Cost and Expense		1,900		1,745	1,608
Valuation Allowances and Reserves, Charged to Other Accounts		52,875	[3]	37	(54)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction		$ 0		$ 0	$ 0

[1] For the year ended December 31, 2020, the amount charged to other accounts relates to the acquisition of Anixter.

[2] Includes a reduction in the allowance for expected credit losses due to the write-off of accounts receivable.

[3] For the year ended December 31, 2020, the amount charged to other accounts includes $59.3 million that was recorded in connection with the acquisition of Anixter.