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v3.19.1

Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 3,957.9 | $ 3,606.4
Revenue net, by Product and Service, Percentage | 100.00% | 100.00%
Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 1,736.2 | $ 1,565.8
Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 355.6 | 327.6
Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,330.7 | 1,230.0
Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 535.4 | 483.0
Transferred at a point in time where CDW is principal |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 3,635.2 | 3,340.1
Transferred at a point in time where CDW is principal | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,581.8 | 1,426.3
Transferred at a point in time where CDW is principal | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 335.2 | 309.4
Transferred at a point in time where CDW is principal | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,243.3 | 1,171.4
Transferred at a point in time where CDW is principal | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 474.9 | 433.0
Transferred at a point in time where CDW is agent |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 183.0 | 165.4
Transferred at a point in time where CDW is agent | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 104.0 | 92.7
Transferred at a point in time where CDW is agent | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 19.8 | 16.5
Transferred at a point in time where CDW is agent | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 46.2 | 41.1
Transferred at a point in time where CDW is agent | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 13.0 | 15.1
Transferred over time where CDW is principal |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 139.7 | 100.9
Transferred over time where CDW is principal | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 50.4 | 46.8
Transferred over time where CDW is principal | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.6 | 1.7
Transferred over time where CDW is principal | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 41.2 | 17.5
Transferred over time where CDW is principal | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 47.5 | 34.9
Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,736.2 | 1,565.8
Corporate | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,736.2 | 1,565.8
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 | 355.6 | 327.6
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 | 355.6 | 327.6
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 | 488.4 | 418.5
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 | 488.4 | 418.5
Government | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Education |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 400.4 | 397.2
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 | 400.4 | 397.2
Education | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Healthcare |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 441.9 | 414.3
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 | 441.9 | 414.3
Healthcare | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 535.4 | 483.0
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 | 535.4 | 483.0
Notebooks/Mobile Devices |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 977.1 | $ 865.9
Revenue net, by Product and Service, Percentage | 24.70% | 24.00%
Netcomm Products |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 512.3 | $ 487.3
Revenue net, by Product and Service, Percentage | 12.90% | 13.50%
Desktops |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 303.7 | $ 310.8
Revenue net, by Product and Service, Percentage | 7.70% | 8.60%
Video |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 271.8 | $ 260.8
Revenue net, by Product and Service, Percentage | 6.90% | 7.20%
Enterprise and Data Storage (Including Drives) |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 290.6 | $ 250.1
Revenue net, by Product and Service, Percentage | 7.30% | 7.00%
Other Hardware |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 782.4 | $ 736.6
Revenue net, by Product and Service, Percentage | 19.80% | 20.40%
Hardware |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 3,137.9 | $ 2,911.5
Revenue net, by Product and Service, Percentage | 79.30% | 80.70%
Hardware | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 1,383.9 | $ 1,250.3
Hardware | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 295.0 | 273.1
Hardware | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,063.1 | 1,007.0
Hardware | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 395.9 | 381.1
Software |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 593.9 | $ 504.0
Revenue net, by Product and Service, Percentage | 15.00% | 14.00%
Software | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 247.4 | $ 219.6
Software | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 48.3 | 42.8
Software | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 221.0 | 184.3
Software | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 77.2 | 57.3
Services |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 196.6 | $ 162.9
Revenue net, by Product and Service, Percentage | 5.00% | 4.50%
Services | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 88.1 | $ 79.3
Services | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 7.0 | 6.3
Services | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 42.3 | 34.6
Services | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 59.2 | 42.7
Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 29.5 | $ 28.0
Revenue net, by Product and Service, Percentage | 0.70% | 0.80%
Other | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 16.8 | $ 16.6
Other | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 5.3 | 5.4
Other | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 4.3 | 4.1
Other | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 3.1 | 1.9
United States |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 3,427.6 | 3,131.2
United States | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,732.9 | 1,564.4
United States | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 355.6 | 327.6
United States | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,330.7 | 1,230.0
United States | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 8.4 | 9.2
Rest of World |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 530.3 | 475.2
Rest of World | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 3.3 | 1.4
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 | $ 527.0 | $ 473.8

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