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Income Taxes Income Tax Expense by Component (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current Income Tax Expense (Benefit) [Abstract]      
Federal $ 206.8us-gaap_CurrentFederalTaxExpenseBenefit $ 96.7us-gaap_CurrentFederalTaxExpenseBenefit $ 110.3us-gaap_CurrentFederalTaxExpenseBenefit
State 19.3us-gaap_CurrentStateAndLocalTaxExpenseBenefit 10.1us-gaap_CurrentStateAndLocalTaxExpenseBenefit 8.0us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 5.8us-gaap_CurrentForeignTaxExpenseBenefit 4.6us-gaap_CurrentForeignTaxExpenseBenefit 5.1us-gaap_CurrentForeignTaxExpenseBenefit
Total current 231.9us-gaap_CurrentIncomeTaxExpenseBenefit 111.4us-gaap_CurrentIncomeTaxExpenseBenefit 123.4us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit) [Abstract]      
Domestic (89.0)cdw_DeferredDomesticIncomeTaxExpenseBenefit (48.6)cdw_DeferredDomesticIncomeTaxExpenseBenefit (56.2)cdw_DeferredDomesticIncomeTaxExpenseBenefit
Foreign (0.1)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (0.1)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (0.1)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred (89.1)us-gaap_DeferredIncomeTaxExpenseBenefit (48.7)us-gaap_DeferredIncomeTaxExpenseBenefit (56.3)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense $ 142.8us-gaap_IncomeTaxExpenseBenefit $ 62.7us-gaap_IncomeTaxExpenseBenefit $ 67.1us-gaap_IncomeTaxExpenseBenefit