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Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 3,606.4 | $ 3,256.0
Revenue net, by Product and Service, Percentage | 100.00% | 100.00%
Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 1,565.8 | $ 1,440.6
Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 327.6 | 292.0
Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,230.0 | 1,153.7
Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 483.0 | 369.7
Transferred at a point in time where CDW is principal |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 3,340.1 | 3,027.2
Transferred at a point in time where CDW is principal | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,426.3 | 1,314.2
Transferred at a point in time where CDW is principal | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 309.4 | 275.7
Transferred at a point in time where CDW is principal | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,171.4 | 1,105.8
Transferred at a point in time where CDW is principal | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 433.0 | 331.5
Transferred at a point in time where CDW is agent |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 165.4 | 141.0
Transferred at a point in time where CDW is agent | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 92.7 | 81.3
Transferred at a point in time where CDW is agent | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 16.5 | 14.0
Transferred at a point in time where CDW is agent | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 41.1 | 37.5
Transferred at a point in time where CDW is agent | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 15.1 | 8.2
Transferred over time where CDW is principal |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 100.9 | 87.8
Transferred over time where CDW is principal | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 46.8 | 45.1
Transferred over time where CDW is principal | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1.7 | 2.3
Transferred over time where CDW is principal | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 17.5 | 10.4
Transferred over time where CDW is principal | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 34.9 | 30.0
Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,565.8 | 1,440.6
Corporate | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,565.8 | 1,440.6
Corporate | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Corporate | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Corporate | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 327.6 | 292.0
Small Business | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Small Business | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 327.6 | 292.0
Small Business | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Small Business | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Government |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 418.5 | 374.6
Government | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Government | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Government | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 418.5 | 374.6
Government | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Education |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 397.2 | 393.2
Education | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Education | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Education | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 397.2 | 393.2
Education | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Healthcare |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 414.3 | 385.9
Healthcare | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Healthcare | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Healthcare | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 414.3 | 385.9
Healthcare | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 483.0 | 369.7
Other | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Other | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Other | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Other | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 483.0 | 369.7
Notebooks/Mobile Devices |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 858.7 | $ 735.5
Revenue net, by Product and Service, Percentage | 23.80% | 22.60%
Netcomm Products |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 482.9 | $ 458.6
Revenue net, by Product and Service, Percentage | 13.40% | 14.10%
Desktops |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 303.5 | $ 263.2
Revenue net, by Product and Service, Percentage | 8.40% | 8.10%
Video |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 259.2 | $ 235.7
Revenue net, by Product and Service, Percentage | 7.20% | 7.20%
Enterprise and Data Storage (Including Drives) |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 256.0 | $ 234.8
Revenue net, by Product and Service, Percentage | 7.10% | 7.20%
Other Hardware |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 751.8 | $ 711.6
Revenue net, by Product and Service, Percentage | 20.80% | 21.90%
Hardware |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 2,912.1 | $ 2,639.4
Revenue net, by Product and Service, Percentage | 80.70% | 81.10%
Hardware | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 1,251.6 | $ 1,146.5
Hardware | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 272.8 | 240.8
Hardware | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,008.2 | 958.6
Hardware | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 379.5 | 293.5
Software |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 505.1 | $ 447.9
Revenue net, by Product and Service, Percentage | 14.00% | 13.80%
Software | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 219.6 | $ 202.0
Software | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 43.1 | 39.9
Software | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 183.1 | 162.8
Software | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 59.3 | 43.2
Services |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 161.2 | $ 141.3
Revenue net, by Product and Service, Percentage | 4.50% | 4.30%
Services | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 78.1 | $ 75.8
Services | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 6.3 | 6.2
Services | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 34.6 | 28.0
Services | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 42.2 | 31.3
Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 28.0 | $ 27.4
Revenue net, by Product and Service, Percentage | 0.80% | 0.80%
Other | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 16.5 | $ 16.3
Other | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 5.4 | 5.1
Other | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 4.1 | 4.3
Other | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 2.0 | 1.7
United States |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 3,131.2 | 2,891.3
United States | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,564.4 | 1,439.5
United States | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 327.6 | 292.0
United States | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,230.0 | 1,153.7
United States | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 9.2 | 6.1
Rest of World |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 475.2 | 364.7
Rest of World | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1.4 | 1.1
Rest of World | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Rest of World | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Rest of World | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 473.8 | $ 363.6

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