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Long-Term Debt - Debt Balances and Interest Rates (Details) £ in Millions, $ in Millions	Dec. 31, 2017 USD ($)	Dec. 31, 2017 GBP (£)	Mar. 02, 2017 USD ($)	Dec. 31, 2016 USD ($)	Aug. 01, 2016 USD ($)	Aug. 01, 2016 GBP (£)
Debt Instrument [Line Items]
Long-term debt	$ 3,255.9			$ 3,267.8
Long-term debt, current maturities, gross	(25.5)			(18.5)
Long-term debt, excluding current maturities, gross	3,230.4			3,249.3
Deferred finance costs, net	(20.4)			(33.4)
Deferred finance costs, current, net	0.0			0.0
Deferred finance costs, noncurrent, net	(20.4)			(33.4)
Long-term debt, net of deferred financing costs	3,235.5			3,234.4
Current maturities of long-term debt, net of deferred financing costs	(25.5)			(18.5)
Long-term debt, excluding current maturities, net of deferred financing costs	$ 3,210.0			$ 3,215.9
Senior secured asset-based revolving credit facility
Debt Instrument [Line Items]
Interest rate in effect	0.00%	0.00%		0.00%
Long-term debt	$ 0.0			$ 0.0
Deferred finance costs, net	0.0			0.0
Long-term debt, net of deferred financing costs	$ 0.0			$ 0.0
CDW UK revolving credit facility
Debt Instrument [Line Items]
Interest rate in effect	0.00%	0.00%		0.00%
Long-term debt	$ 0.0	£ 0		$ 0.0
Deferred finance costs, net	0.0			0.0
Long-term debt, net of deferred financing costs	$ 0.0			$ 0.0
Senior secured term loan facility
Debt Instrument [Line Items]
Interest rate in effect	3.70%	3.70%		3.30%
Long-term debt	$ 1,468.0			$ 1,483.0
Deferred finance costs, net	(2.0)			(14.9)
Long-term debt, net of deferred financing costs	$ 1,466.0			$ 1,468.1
CDW UK term loan
Debt Instrument [Line Items]
Interest rate in effect	1.92%	1.92%		1.80%
Long-term debt	$ 75.7			$ 69.1	$ 76.0	£ 56
Deferred finance costs, net	(1.4)			(1.6)
Long-term debt, net of deferred financing costs	$ 74.3			$ 67.5
Senior notes due 2022
Debt Instrument [Line Items]
Interest rate in effect				6.00%
Long-term debt			$ 600.0	$ 600.0
Deferred finance costs, net				(5.6)
Long-term debt, net of deferred financing costs				$ 594.4
Senior notes due 2023
Debt Instrument [Line Items]
Interest rate in effect	5.00%	5.00%		5.00%
Long-term debt	$ 525.0			$ 525.0
Deferred finance costs, net	(4.5)			(5.3)
Long-term debt, net of deferred financing costs	$ 520.5			$ 519.7
Senior notes due 2024
Debt Instrument [Line Items]
Interest rate in effect	5.50%	5.50%		5.50%
Long-term debt	$ 575.0			$ 575.0
Deferred finance costs, net	(5.2)			(6.0)
Long-term debt, net of deferred financing costs	$ 569.8			569.0
Senior notes due 2025
Debt Instrument [Line Items]
Interest rate in effect	5.00%	5.00%
Long-term debt	$ 600.0		$ 600.0
Deferred finance costs, net	(7.3)
Long-term debt, net of deferred financing costs	592.7
Other long-term obligations
Debt Instrument [Line Items]
Long-term debt	12.2			15.7
Deferred finance costs, net	0.0			0.0
Long-term debt, net of deferred financing costs	$ 12.2			$ 15.7

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Amount of long-term debt, after unamortized deferred financing costs, discount, or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt before deduction of unamortized deferred financing costs, discount, or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt, and other types of debt.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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