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Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Net sales | $ 20,998.7 | $ 21,376.0 | $ 23,748.7
Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 8,837.2 | 8,960.8 | 10,350.1
Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,523.5 | 1,556.0 | 1,938.9
Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 8,157.7 | 8,305.7 | 8,551.3
Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,480.3 | 2,553.5 | 2,908.4
Transferred at a point in time where CDW is principal |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 17,973.0 | 18,512.9 | 21,016.1
Transferred at a point in time where CDW is principal | Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 7,369.0 | 7,515.7 | 8,971.4
Transferred at a point in time where CDW is principal | Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,325.6 | 1,374.1 | 1,751.1
Transferred at a point in time where CDW is principal | Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 7,176.7 | 7,411.1 | 7,717.1
Transferred at a point in time where CDW is principal | Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,101.7 | 2,212.0 | 2,576.5
Transferred at a point in time where CDW is agent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,607.6 | 1,521.8 | 1,414.0
Transferred at a point in time where CDW is agent | Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 807.1 | 778.0 | 749.3
Transferred at a point in time where CDW is agent | Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 146.7 | 145.3 | 140.1
Transferred at a point in time where CDW is agent | Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 526.9 | 480.6 | 426.9
Transferred at a point in time where CDW is agent | Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 126.9 | 117.9 | 97.7
Transferred over time where CDW is principal |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,418.1 | 1,341.3 | 1,318.6
Transferred over time where CDW is principal | Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 661.1 | 667.1 | 629.4
Transferred over time where CDW is principal | Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 51.2 | 36.6 | 47.7
Transferred over time where CDW is principal | Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 454.1 | 414.0 | 407.3
Transferred over time where CDW is principal | Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 251.7 | 223.6 | 234.2
Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 8,837.2 | 8,960.8 | 10,350.1
Corporate | Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 8,837.2 | 8,960.8 | 10,350.1
Corporate | Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Corporate | Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Corporate | Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,523.5 | 1,556.0 | 1,938.9
Small Business | Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Small Business | Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,523.5 | 1,556.0 | 1,938.9
Small Business | Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Small Business | Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Government |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,486.9 | 2,669.1 | 2,574.3
Government | Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Government | Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Government | Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,486.9 | 2,669.1 | 2,574.3
Government | Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Education |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 3,167.3 | 3,298.3 | 3,621.4
Education | Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Education | Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Education | Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 3,167.3 | 3,298.3 | 3,621.4
Education | Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Healthcare |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,503.5 | 2,338.3 | 2,355.6
Healthcare | Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Healthcare | Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Healthcare | Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,503.5 | 2,338.3 | 2,355.6
Healthcare | Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,480.3 | 2,553.5 | 2,908.4
Other | Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Other | Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Other | Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Other | Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,480.3 | 2,553.5 | 2,908.4
Hardware |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 15,219.1 | 15,702.6 | 18,091.0
Hardware | Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 6,015.5 | 6,216.9 | 7,561.0
Hardware | Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,201.6 | 1,242.3 | 1,610.7
Hardware | Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 6,225.1 | 6,460.4 | 6,763.9
Hardware | Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,776.9 | 1,783.0 | 2,155.4
Software |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 3,804.4 | 3,799.3 | 3,684.9
Software | Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,863.0 | 1,772.3 | 1,781.5
Software | Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 228.7 | 232.8 | 232.9
Software | Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,320.5 | 1,295.4 | 1,196.9
Software | Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 392.2 | 498.8 | 473.6
Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,867.3 | 1,761.3 | 1,842.0
Services | Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 898.5 | 909.1 | 929.3
Services | Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 75.8 | 62.6 | 73.8
Services | Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 593.6 | 531.5 | 570.7
Services | Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 299.4 | 258.1 | 268.2
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 107.9 | 112.8 | 130.8
Other | Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 60.2 | 62.5 | 78.3
Other | Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 17.4 | 18.3 | 21.5
Other | Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 18.5 | 18.4 | 19.8
Other | Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 11.8 | 13.6 | 11.2
United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 18,456.9 | 18,754.9 | 20,828.6
United States | Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 8,779.4 | 8,894.5 | 10,321.2
United States | Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,499.8 | 1,534.5 | 1,934.8
United States | Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 8,150.4 | 8,299.4 | 8,550.8
United States | Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 27.3 | 26.5 | 21.8
Rest of World |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,541.8 | 2,621.1 | 2,920.1
Rest of World | Operating Segments | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 57.8 | 66.3 | 28.9
Rest of World | Operating Segments | Small Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 23.7 | 21.5 | 4.1
Rest of World | Operating Segments | Public |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 7.3 | 6.3 | 0.5
Rest of World | Operating Segments | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | $ 2,453.0 | $ 2,527.0 | $ 2,886.6

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