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Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 4,186.1 | $ 3,891.7 | $ 7,792.5 | $ 7,147.6
Revenue net, by Product and Service, Percentage | 100.00% | 100.00% | 100.00% | 100.00%
Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 1,733.8 | $ 1,580.1 | $ 3,299.6 | $ 3,020.7
Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 329.5 | 315.0 | 657.1 | 607.0
Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,635.4 | 1,632.8 | 2,865.4 | 2,786.5
Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 487.4 | 363.8 | 970.4 | 733.4
Transferred at a point in time where CDW is principal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 3,871.9 | 3,599.5 | 7,184.5 | 6,601.2
Transferred at a point in time where CDW is principal | Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,583.4 | 1,437.9 | 3,009.7 | 2,752.2
Transferred at a point in time where CDW is principal | Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 309.6 | 296.7 | 619.0 | 572.4
Transferred at a point in time where CDW is principal | Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,537.3 | 1,539.3 | 2,681.2 | 2,619.7
Transferred at a point in time where CDW is principal | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 441.6 | 325.6 | 874.6 | 656.9
Transferred at a point in time where CDW is agent |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 183.6 | 167.6 | 349.0 | 308.4
Transferred at a point in time where CDW is agent | Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 101.5 | 92.6 | 194.2 | 173.8
Transferred at a point in time where CDW is agent | Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 17.1 | 16.0 | 33.6 | 29.9
Transferred at a point in time where CDW is agent | Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 55.3 | 52.1 | 96.4 | 89.6
Transferred at a point in time where CDW is agent | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 9.7 | 6.9 | 24.8 | 15.1
Transferred over time where CDW is principal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 130.6 | 124.6 | 259.0 | 238.0
Transferred over time where CDW is principal | Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 48.9 | 49.6 | 95.7 | 94.7
Transferred over time where CDW is principal | Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2.8 | 2.3 | 4.5 | 4.7
Transferred over time where CDW is principal | Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 42.8 | 41.4 | 87.8 | 77.2
Transferred over time where CDW is principal | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 36.1 | 31.3 | 71.0 | 61.4
Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,733.8 | 1,580.1 | 3,299.6 | 3,020.7
Corporate | Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,733.8 | 1,580.1 | 3,299.6 | 3,020.7
Corporate | Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Corporate | Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Corporate | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 329.5 | 315.0 | 657.1 | 607.0
Small Business | Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Small Business | Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 329.5 | 315.0 | 657.1 | 607.0
Small Business | Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Small Business | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 493.5 | 523.4 | 912.0 | 898.1
Government | Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Government | Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Government | Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 493.5 | 523.4 | 912.0 | 898.1
Government | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Education |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 712.1 | 704.9 | 1,109.3 | 1,098.1
Education | Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Education | Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Education | Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 712.1 | 704.9 | 1,109.3 | 1,098.1
Education | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Healthcare |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 429.8 | 404.5 | 844.1 | 790.3
Healthcare | Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Healthcare | Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Healthcare | Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 429.8 | 404.5 | 844.1 | 790.3
Healthcare | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 487.4 | 363.8 | 970.4 | 733.4
Other | Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Other | Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Other | Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Other | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 487.4 | 363.8 | 970.4 | 733.4
Notebooks/Mobile Devices |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 1,068.3 | $ 912.8 | $ 1,927.0 | $ 1,647.1
Revenue net, by Product and Service, Percentage | 25.50% | 23.50% | 24.70% | 23.00%
Netcomm Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 498.6 | $ 540.3 | $ 981.5 | $ 999.2
Revenue net, by Product and Service, Percentage | 11.90% | 13.90% | 12.60% | 14.00%
Desktops |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 345.3 | $ 308.6 | $ 648.8 | $ 571.5
Revenue net, by Product and Service, Percentage | 8.20% | 7.90% | 8.30% | 8.00%
Video |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 325.8 | $ 289.5 | $ 585.0 | $ 525.0
Revenue net, by Product and Service, Percentage | 7.80% | 7.40% | 7.50% | 7.30%
Enterprise and Data Storage (Including Drives) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 264.5 | $ 291.3 | $ 520.5 | $ 525.7
Revenue net, by Product and Service, Percentage | 6.30% | 7.50% | 6.70% | 7.40%
Other Hardware |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 879.7 | $ 778.1 | $ 1,631.5 | $ 1,492.2
Revenue net, by Product and Service, Percentage | 21.10% | 20.00% | 21.00% | 20.90%
Hardware |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 3,382.2 | $ 3,120.6 | $ 6,294.3 | $ 5,760.7
Revenue net, by Product and Service, Percentage | 80.80% | 80.20% | 80.80% | 80.60%
Hardware | Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 1,380.8 | $ 1,238.5 | $ 2,632.4 | $ 2,385.9
Hardware | Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 273.9 | 261.0 | 546.7 | 501.7
Hardware | Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,337.8 | 1,329.7 | 2,346.0 | 2,288.3
Hardware | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 389.7 | 291.4 | 769.2 | 584.8
Software |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 605.7 | $ 589.7 | $ 1,110.8 | $ 1,036.6
Revenue net, by Product and Service, Percentage | 14.50% | 15.20% | 14.30% | 14.50%
Software | Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 254.2 | $ 243.5 | $ 473.8 | $ 444.5
Software | Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 42.6 | 42.5 | 85.7 | 82.5
Software | Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 255.8 | 263.9 | 438.9 | 426.7
Software | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 53.1 | 39.8 | 112.4 | 82.9
Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 168.8 | $ 152.8 | $ 330.0 | $ 294.2
Revenue net, by Product and Service, Percentage | 4.00% | 3.90% | 4.20% | 4.10%
Services | Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 81.3 | $ 81.3 | $ 159.4 | $ 157.1
Services | Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 7.7 | 6.2 | 14.0 | 12.5
Services | Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 37.6 | 34.7 | 72.2 | 62.7
Services | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 42.2 | 30.6 | 84.4 | 61.9
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 29.4 | $ 28.6 | $ 57.4 | $ 56.1
Revenue net, by Product and Service, Percentage | 0.70% | 0.70% | 0.70% | 0.80%
Other | Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 17.5 | $ 16.8 | $ 34.0 | $ 33.2
Other | Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 5.3 | 5.3 | 10.7 | 10.3
Other | Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 4.2 | 4.5 | 8.3 | 8.8
Other | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2.4 | 2.0 | 4.4 | 3.8
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 3,704.3 | 3,533.4 | 6,835.5 | 6,424.8
United States | Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,731.4 | 1,578.5 | 3,295.8 | 3,018.1
United States | Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 329.5 | 315.0 | 657.1 | 607.0
United States | Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,635.4 | 1,632.8 | 2,865.4 | 2,786.5
United States | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 8.0 | 7.1 | 17.2 | 13.2
Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 481.8 | 358.3 | 957.0 | 722.8
Rest of World | Operating Segments | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2.4 | 1.6 | 3.8 | 2.6
Rest of World | Operating Segments | Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Rest of World | Operating Segments | Public |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Rest of World | Operating Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 479.4 | $ 356.7 | $ 953.2 | $ 720.2

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