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v3.20.1

Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 4,389.2 | $ 3,957.9
Percentage of Total Net Sales | 100.00% | 100.00%
Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 1,911.0 | $ 1,736.2
Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 391.5 | 355.6
Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,525.3 | 1,330.7
Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 561.4 | 535.4
Transferred at a point in time where CDW is principal |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 4,011.3 | 3,635.2
Transferred at a point in time where CDW is principal | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,741.0 | 1,581.8
Transferred at a point in time where CDW is principal | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 366.7 | 335.2
Transferred at a point in time where CDW is principal | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,404.6 | 1,243.3
Transferred at a point in time where CDW is principal | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 499.0 | 474.9
Transferred at a point in time where CDW is agent |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 195.1 | 183.0
Transferred at a point in time where CDW is agent | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 107.6 | 104.0
Transferred at a point in time where CDW is agent | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 22.0 | 19.8
Transferred at a point in time where CDW is agent | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 52.3 | 46.2
Transferred at a point in time where CDW is agent | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 13.2 | 13.0
Transferred over time where CDW is principal |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 182.8 | 139.7
Transferred over time where CDW is principal | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 62.4 | 50.4
Transferred over time where CDW is principal | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 2.8 | 0.6
Transferred over time where CDW is principal | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 68.4 | 41.2
Transferred over time where CDW is principal | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 49.2 | 47.5
Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,911.0 | 1,736.2
Corporate | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,911.0 | 1,736.2
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 | 391.5 | 355.6
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 | 391.5 | 355.6
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 | 568.5 | 488.4
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 | 568.5 | 488.4
Government | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Education |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 476.2 | 400.4
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 | 476.2 | 400.4
Education | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Healthcare |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 480.6 | 441.9
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 | 480.6 | 441.9
Healthcare | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0.0 | 0.0
Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 561.4 | 535.4
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 | 561.4 | 535.4
Hardware |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 3,456.5 | $ 3,146.3
Percentage of Total Net Sales | 78.70% | 79.50%
Hardware | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 1,513.9 | $ 1,384.7
Hardware | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 324.4 | 295.1
Hardware | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,210.8 | 1,063.3
Hardware | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 407.4 | 403.2
Notebooks/Mobile Devices |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 1,111.0 | $ 916.1
Percentage of Total Net Sales | 25.30% | 23.10%
Netcomm Products |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 456.4 | $ 511.4
Percentage of Total Net Sales | 10.40% | 12.90%
Desktops |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 384.3 | $ 297.0
Percentage of Total Net Sales | 8.80% | 7.50%
Video |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 314.6 | $ 271.3
Percentage of Total Net Sales | 7.20% | 6.90%
Enterprise and Data Storage (Including Drives) |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 240.5 | $ 293.3
Percentage of Total Net Sales | 5.50% | 7.40%
Other Hardware |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 949.7 | $ 857.2
Percentage of Total Net Sales | 21.50% | 21.70%
Software |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 666.3 | $ 593.0
Percentage of Total Net Sales | 15.20% | 15.00%
Software | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 276.0 | $ 246.5
Software | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 53.5 | 48.1
Software | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 239.7 | 221.1
Software | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 97.1 | 77.3
Services |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 230.6 | $ 189.0
Percentage of Total Net Sales | 5.30% | 4.80%
Services | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 100.1 | $ 88.0
Services | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 8.2 | 7.0
Services | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 67.8 | 42.1
Services | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 54.5 | 51.9
Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 35.8 | $ 29.6
Percentage of Total Net Sales | 0.80% | 0.70%
Other | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 21.0 | $ 17.0
Other | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 5.4 | 5.4
Other | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 7.0 | 4.2
Other | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 2.4 | 3.0
United States |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 3,830.8 | 3,427.6
United States | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,907.8 | 1,732.9
United States | Operating Segments | Small Business |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 391.5 | 355.6
United States | Operating Segments | Public |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,525.3 | 1,330.7
United States | Operating Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 6.2 | 8.4
Rest of World |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 558.4 | 530.3
Rest of World | Operating Segments | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 3.2 | 3.3
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 | $ 555.2 | $ 527.0

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