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Long-Term Debt - Narrative (Details) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2019 GBP (£)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Sep. 26, 2019 USD ($)	Dec. 31, 2018 USD ($)	Apr. 03, 2018
Debt Instrument [Line Items]
Long-term debt				$ 3,337.9		$ 3,226.5
CDW UK revolving credit facility
Debt Instrument [Line Items]
Borrowing capacity of the Revolving Loan	£ 50,000,000			66.0
Long-term debt				$ 0.0		$ 0.0
Interest rate in effect	0.00%			0.00%		0.00%
Senior secured asset-based revolving credit facility
Debt Instrument [Line Items]
Undrawn letters of credit				$ 1.0
Borrowing base				2,000.0
Additional borrowing capacity				1,000.0
Long-term debt				51.0		$ 0.0
CDW UK term loan
Debt Instrument [Line Items]
Annual principal repayment installments	£ 5,000,000	$ 7.0
Amount of restricted payment capacity under the loan	£ 154,000,000			204.0
Long-term debt				$ 61.0		$ 65.0
Interest rate in effect	2.19%			2.19%		2.29%
Senior secured term loan facility
Debt Instrument [Line Items]
Amount of restricted payment capacity under the loan				$ 1,800.0
Periodic payment, principal			$ 4.0
Long-term debt				$ 1,438.3		$ 1,453.2
Interest rate in effect	3.55%			3.55%		4.10%
Senior notes due 2028
Debt Instrument [Line Items]
Long-term debt					$ 600.0	$ 0.0
Interest rate in effect					4.25%	0.00%
Senior notes due 2023
Debt Instrument [Line Items]
Long-term debt				$ 0.0	$ 525.0	$ 525.0
Interest rate in effect	0.00%			0.00%		5.00%
Redemption price, percentage			102.50%
LIBOR | CDW UK term loan
Debt Instrument [Line Items]
Margin on borrowings, reduced interest rate from refinancing in bps							0.25%
Accounts Payable, Inventory Financing | Senior secured asset-based revolving credit facility
Debt Instrument [Line Items]
Amount owed under Revolving loan financing agreement				$ 359.0

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