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Income Taxes Deferred Tax Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets, Gross [Abstract]    
Deferred interest $ 32.9cdw_DeferredTaxAssetsDeferredInterest $ 43.5cdw_DeferredTaxAssetsDeferredInterest
State net operating loss and credit carryforwards, net 18.8us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 21.1us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Payroll and benefits 27.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 16.2us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Deferred Tax Assets, Rent 5.5cdw_DeferredTaxAssetsRent 6.4cdw_DeferredTaxAssetsRent
Accounts receivable 6.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 5.4us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost 6.5us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other 1.5us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 1.5us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Other 5.0us-gaap_DeferredTaxAssetsOther 7.1us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 103.5us-gaap_DeferredTaxAssetsGross 102.8us-gaap_DeferredTaxAssetsGross
Deferred Tax Liabilities, Gross [Abstract]    
Software and intangibles 425.3us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 486.2us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Deferred Income 116.2us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome 145.5us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome
Property and equipment 22.5us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 25.0us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other 15.3us-gaap_DeferredTaxLiabilitiesOther 11.6us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilites 579.3us-gaap_DeferredIncomeTaxLiabilities 668.3us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets valuation allowance 0us-gaap_DeferredTaxAssetsValuationAllowance 0us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax liabilities 475.8us-gaap_DeferredTaxLiabilities 565.5us-gaap_DeferredTaxLiabilities
Operating Loss Carryforwards [Line Items]    
Undistributed Earnings of Foreign Subsidiaries 66.6us-gaap_UndistributedEarningsOfForeignSubsidiaries  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards 124.0us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Tax Credit Carryforward, Amount $ 19.6us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember