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Schedule of Goodwill by Segment (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Roll Forward]      
Goodwill, Gross $ 4,174.1us-gaap_GoodwillGross $ 4,163.1us-gaap_GoodwillGross  
Period Increase (Decrease) (2.7)us-gaap_GoodwillPeriodIncreaseDecrease 11.0us-gaap_GoodwillPeriodIncreaseDecrease  
Translation adjustment (2.7)us-gaap_GoodwillTranslationAdjustments (2.1)us-gaap_GoodwillTranslationAdjustments  
Contingent consideration related to pre-2009 business combination   13.1cdw_Contingentconsiderationrelatedtopre2009businesscombination [1]  
Goodwill, Gross 4,171.4us-gaap_GoodwillGross 4,174.1us-gaap_GoodwillGross  
Accumulated impairment charges (1,953.8)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss (1,953.8)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss (1,953.8)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill 2,217.6us-gaap_Goodwill 2,220.3us-gaap_Goodwill 2,209.3us-gaap_Goodwill
Corporate [Member]      
Goodwill [Roll Forward]      
Goodwill, Gross 2,803.2us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_CorporateSegmentMember		 2,794.4us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_CorporateSegmentMember		  
Period Increase (Decrease) 0us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_CorporateSegmentMember		 8.8us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_CorporateSegmentMember		  
Translation adjustment 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_CorporateSegmentMember		 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_CorporateSegmentMember		  
Contingent consideration related to pre-2009 business combination   8.8cdw_Contingentconsiderationrelatedtopre2009businesscombination
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_CorporateSegmentMember		 [1]  
Goodwill, Gross 2,803.2us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_CorporateSegmentMember		 2,803.2us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_CorporateSegmentMember		  
Accumulated impairment charges (1,571.4)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_CorporateSegmentMember		 (1,571.4)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_CorporateSegmentMember		 (1,571.4)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_CorporateSegmentMember
Goodwill 1,231.8us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_CorporateSegmentMember		 1,231.8us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_CorporateSegmentMember		 1,223.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_CorporateSegmentMember
Public [Member]      
Goodwill [Roll Forward]      
Goodwill, Gross 1,265.4us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_PublicMember		 1,261.4us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_PublicMember		  
Period Increase (Decrease) 0us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_PublicMember		 4.0us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_PublicMember		  
Translation adjustment 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_PublicMember		 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_PublicMember		  
Contingent consideration related to pre-2009 business combination   4.0cdw_Contingentconsiderationrelatedtopre2009businesscombination
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_PublicMember		 [1]  
Goodwill, Gross 1,265.4us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_PublicMember		 1,265.4us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_PublicMember		  
Accumulated impairment charges (354.1)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_PublicMember		 (354.1)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_PublicMember		 (354.1)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_PublicMember
Goodwill 911.3us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_PublicMember		 911.3us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_PublicMember		 907.3us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_PublicMember
Other Segments [Member]      
Goodwill [Roll Forward]      
Goodwill, Gross 105.5us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [2] 107.3us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [2]  
Period Increase (Decrease) (2.7)us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [2] (1.8)us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [2]  
Translation adjustment (2.7)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [2] (2.1)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [2]  
Contingent consideration related to pre-2009 business combination   0.3cdw_Contingentconsiderationrelatedtopre2009businesscombination
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [1],[2]  
Goodwill, Gross 102.8us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [2] 105.5us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [2]  
Accumulated impairment charges (28.3)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [2] (28.3)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [2] (28.3)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [2]
Goodwill 74.5us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [2] 77.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [2] 79.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [2]
Kelway Operating Segment [Member]      
Goodwill [Roll Forward]      
Goodwill $ 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_KelwayOperatingSegmentMember		 $ 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_KelwayOperatingSegmentMember		 $ 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cdw_KelwayOperatingSegmentMember
[1] During 2013, the Company recorded a $13.1 million net-of-tax addition to goodwill in connection with the settlement of the MPK Coworker Incentive Plan II and related charitable contribution. The charitable contribution was accounted for as additional purchase price (goodwill) in accordance with pre-2009 business combinations accounting guidance. See Note 10 for additional discussion of this transaction.
[2] Other is comprised of CDW Advanced Services, Canada, and Kelway reporting units. There is no goodwill attributable to the Kelway reporting unit.