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Segment Information - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 5,516.6 | $ 5,628.3 | $ 15,812.7 | $ 16,357.5
Percentage of Total Net Sales | 100.00% | 100.00% | 100.00% | 100.00%
Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 2,161.2 | $ 2,226.5 | $ 6,492.3 | $ 6,675.2
Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 379.7 | 378.4 | 1,143.5 | 1,186.0
Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2,335.7 | 2,422.1 | 6,303.7 | 6,530.0
Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 640.0 | 601.3 | 1,873.2 | 1,966.3
Transferred at a point in time where CDW is principal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 4,721.0 | 4,884.6 | 13,561.6 | 14,244.6
Transferred at a point in time where CDW is principal | Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,799.8 | 1,861.9 | 5,409.5 | 5,614.6
Transferred at a point in time where CDW is principal | Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 328.1 | 333.1 | 997.0 | 1,053.3
Transferred at a point in time where CDW is principal | Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2,053.4 | 2,169.3 | 5,561.3 | 5,858.6
Transferred at a point in time where CDW is principal | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 539.7 | 520.3 | 1,593.8 | 1,718.1
Transferred at a point in time where CDW is agent |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 428.1 | 399.7 | 1,194.1 | 1,113.1
Transferred at a point in time where CDW is agent | Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 197.5 | 192.9 | 585.5 | 563.3
Transferred at a point in time where CDW is agent | Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 37.0 | 37.1 | 110.3 | 106.8
Transferred at a point in time where CDW is agent | Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 160.0 | 143.9 | 402.7 | 362.1
Transferred at a point in time where CDW is agent | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 33.6 | 25.8 | 95.6 | 80.9
Transferred over time where CDW is principal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 367.5 | 344.0 | 1,057.0 | 999.8
Transferred over time where CDW is principal | Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 163.9 | 171.7 | 497.3 | 497.3
Transferred over time where CDW is principal | Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 14.6 | 8.2 | 36.2 | 25.9
Transferred over time where CDW is principal | Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 122.3 | 108.9 | 339.7 | 309.3
Transferred over time where CDW is principal | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 66.7 | 55.2 | 183.8 | 167.3
Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2,161.2 | 2,226.5 | 6,492.3 | 6,675.2
Corporate | Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2,161.2 | 2,226.5 | 6,492.3 | 6,675.2
Corporate | Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Corporate | Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Corporate | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Small Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 379.7 | 378.4 | 1,143.5 | 1,186.0
Small Business | Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Small Business | Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 379.7 | 378.4 | 1,143.5 | 1,186.0
Small Business | Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Small Business | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 691.0 | 775.7 | 1,873.4 | 2,008.4
Government | Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Government | Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Government | Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 691.0 | 775.7 | 1,873.4 | 2,008.4
Government | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Education |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 995.7 | 1,026.7 | 2,609.9 | 2,719.2
Education | Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Education | Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Education | Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 995.7 | 1,026.7 | 2,609.9 | 2,719.2
Education | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Healthcare |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 649.0 | 619.7 | 1,820.4 | 1,802.4
Healthcare | Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Healthcare | Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Healthcare | Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 649.0 | 619.7 | 1,820.4 | 1,802.4
Healthcare | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 640.0 | 601.3 | 1,873.2 | 1,966.3
Other | Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Other | Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Other | Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Other | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 640.0 | 601.3 | 1,873.2 | 1,966.3
Hardware |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 3,958.6 | $ 4,181.4 | $ 11,566.6 | $ 12,149.9
Percentage of Total Net Sales | 71.80% | 74.30% | 73.10% | 74.30%
Hardware | Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 1,468.6 | $ 1,570.8 | $ 4,466.4 | $ 4,686.6
Hardware | Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 294.7 | 300.4 | 902.0 | 952.6
Hardware | Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,742.8 | 1,883.4 | 4,855.4 | 5,130.8
Hardware | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 452.5 | 426.8 | 1,342.8 | 1,379.9
Notebooks/Mobile Devices |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 1,370.4 | $ 1,228.9 | $ 3,949.9 | $ 3,614.4
Percentage of Total Net Sales | 24.80% | 21.80% | 25.00% | 22.10%
Netcomm Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 667.6 | $ 877.1 | $ 1,877.1 | $ 2,538.0
Percentage of Total Net Sales | 12.10% | 15.60% | 11.90% | 15.50%
Collaboration |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 460.3 | $ 490.1 | $ 1,364.9 | $ 1,499.7
Percentage of Total Net Sales | 8.30% | 8.70% | 8.60% | 9.20%
Data Storage and Servers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 506.0 | $ 575.6 | $ 1,593.2 | $ 1,653.6
Percentage of Total Net Sales | 9.20% | 10.20% | 10.10% | 10.10%
Desktops |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 291.4 | $ 264.6 | $ 845.3 | $ 827.3
Percentage of Total Net Sales | 5.30% | 4.70% | 5.30% | 5.10%
Other Hardware |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 662.9 | $ 745.1 | $ 1,936.2 | $ 2,016.9
Percentage of Total Net Sales | 12.10% | 13.30% | 12.20% | 12.30%
Software |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 1,048.3 | $ 997.0 | $ 2,778.3 | $ 2,805.8
Percentage of Total Net Sales | 19.00% | 17.70% | 17.60% | 17.20%
Software | Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 458.4 | $ 423.6 | $ 1,312.1 | $ 1,265.4
Software | Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 60.3 | 59.5 | 173.7 | 174.3
Software | Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 427.0 | 407.1 | 992.6 | 982.7
Software | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 102.6 | 106.8 | 299.9 | 383.4
Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 481.9 | $ 421.3 | $ 1,386.1 | $ 1,316.6
Percentage of Total Net Sales | 8.70% | 7.50% | 8.80% | 8.00%
Services | Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 218.9 | $ 216.5 | $ 668.1 | $ 675.4
Services | Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 20.4 | 13.9 | 54.7 | 45.1
Services | Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 161.0 | 126.5 | 441.6 | 402.3
Services | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 81.6 | 64.4 | 221.7 | 193.8
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 27.8 | $ 28.6 | $ 81.7 | $ 85.2
Percentage of Total Net Sales | 0.50% | 0.50% | 0.50% | 0.50%
Other | Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 15.3 | $ 15.6 | $ 45.7 | $ 47.8
Other | Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 4.3 | 4.6 | 13.1 | 14.0
Other | Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 4.9 | 5.1 | 14.1 | 14.2
Other | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 3.3 | 3.3 | 8.8 | 9.2
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 4,863.1 | 5,003.8 | 13,892.8 | 14,337.6
United States | Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2,149.4 | 2,206.8 | 6,448.0 | 6,620.0
United States | Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 373.0 | 370.3 | 1,125.9 | 1,170.6
United States | Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2,333.8 | 2,419.4 | 6,298.6 | 6,525.8
United States | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 6.9 | 7.3 | 20.3 | 21.2
Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 653.5 | 624.5 | 1,919.9 | 2,019.9
Rest of World | Corporate | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 11.8 | 19.7 | 44.3 | 55.2
Rest of World | Small Business | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 6.7 | 8.1 | 17.6 | 15.4
Rest of World | Public | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1.9 | 2.7 | 5.1 | 4.2
Rest of World | Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 633.1 | $ 594.0 | $ 1,852.9 | $ 1,945.1

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