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Inventory Financing Agreements (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Inventory Financing Agreements [Line Items] |  |
Accounts payable-inventory financing | $ 498.0 | $ 580.4
Accounts Payable, Inventory Financing |  |
Inventory Financing Agreements [Line Items] |  |
Revolving Loan financing agreement | 480.9 | 558.3
Other inventory financing agreements | 17.1 | 22.1
Accounts payable-inventory financing | 498.0 | 580.4
Accounts Payable, Inventory Financing Collateralized |  |
Inventory Financing Agreements [Line Items] |  |
Other inventory financing agreements | $ 1.0 | $ 3.0

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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: |

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