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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