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Inventory Financing Agreements (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Inventory Financing Agreements [Line Items] |  |
Accounts payable-inventory financing | $ 387.6 | $ 498.0
Accounts Payable, Inventory Financing |  |
Inventory Financing Agreements [Line Items] |  |
Revolving Loan inventory financing agreement | 380.0 | 480.9
Other inventory financing agreements | $ 7.6 | $ 17.1

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- Definition Accounts payable inventory financing. + References No definition available. + Details
Name: | cdw_AccountsPayableInventoryFinancing
Namespace Prefix: | cdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Inventory Financing Agreements [Line Items] + References No definition available. + Details
Name: | cdw_InventoryFinancingAgreementsLineItems
Namespace Prefix: | cdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Other inventory financing agreements + References No definition available. + Details
Name: | cdw_OtherInventoryFinancingAgreements
Namespace Prefix: | cdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Revolving Loan financing agreement + References No definition available. + Details
Name: | cdw_RevolvingLoanFinancingAgreement
Namespace Prefix: | cdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | cdw_InventoryFinancingAgreementsAxis=cdw_AccountsPayableInventoryFinancingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |