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Segment Information - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Net sales $ 5,423.4 $ 5,626.1 $ 10,296.1 $ 10,729.2
Percentage of Total Net Sales 100.00% 100.00% 100.00% 100.00%
Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales $ 2,195.2 $ 2,245.0 $ 4,331.1 $ 4,448.7
Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 382.9 396.2 763.8 807.6
Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2,243.3 2,295.1 3,968.0 4,107.9
Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 602.0 689.8 1,233.2 1,365.0
Transferred at a point in time where CDW is principal        
Disaggregation of Revenue [Line Items]        
Net sales 4,671.8 4,934.2 8,840.6 9,360.0
Transferred at a point in time where CDW is principal | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1,830.4 1,891.3 3,609.7 3,752.7
Transferred at a point in time where CDW is principal | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 337.2 354.9 668.9 720.2
Transferred at a point in time where CDW is principal | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1,992.2 2,080.7 3,507.9 3,689.3
Transferred at a point in time where CDW is principal | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 512.0 607.3 1,054.1 1,197.8
Transferred at a point in time where CDW is agent        
Disaggregation of Revenue [Line Items]        
Net sales 392.7 361.3 766.0 713.4
Transferred at a point in time where CDW is agent | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 193.2 185.0 388.0 370.4
Transferred at a point in time where CDW is agent | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 34.2 32.9 73.3 69.7
Transferred at a point in time where CDW is agent | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 134.5 116.7 242.7 218.2
Transferred at a point in time where CDW is agent | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 30.8 26.7 62.0 55.1
Transferred over time where CDW is principal        
Disaggregation of Revenue [Line Items]        
Net sales 358.9 330.6 689.5 655.8
Transferred over time where CDW is principal | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 171.6 168.7 333.4 325.6
Transferred over time where CDW is principal | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 11.5 8.4 21.6 17.7
Transferred over time where CDW is principal | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 116.6 97.7 217.4 200.4
Transferred over time where CDW is principal | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 59.2 55.8 117.1 112.1
Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 2,195.2 2,245.0 4,331.1 4,448.7
Corporate | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2,195.2 2,245.0 4,331.1 4,448.7
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 382.9 396.2 763.8 807.6
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 382.9 396.2 763.8 807.6
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 639.1 681.2 1,182.4 1,232.7
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 639.1 681.2 1,182.4 1,232.7
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 1,017.4 1,026.8 1,614.2 1,692.5
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 1,017.4 1,026.8 1,614.2 1,692.5
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 586.8 587.1 1,171.4 1,182.7
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 586.8 587.1 1,171.4 1,182.7
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 602.0 689.8 1,233.2 1,365.0
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 602.0 689.8 1,233.2 1,365.0
Hardware        
Disaggregation of Revenue [Line Items]        
Net sales $ 4,061.9 $ 4,280.3 $ 7,608.0 $ 7,968.5
Percentage of Total Net Sales 74.90% 76.10% 73.90% 74.30%
Hardware | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,532.2 $ 1,596.4 $ 2,997.8 $ 3,115.8
Hardware | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 307.3 317.5 607.3 652.2
Hardware | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1,796.2 1,884.9 3,112.6 3,247.4
Hardware | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 426.2 481.5 890.3 953.1
Notebooks/Mobile Devices        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,438.2 $ 1,320.9 $ 2,579.5 $ 2,385.5
Percentage of Total Net Sales 26.50% 23.50% 25.10% 22.20%
Netcomm Products        
Disaggregation of Revenue [Line Items]        
Net sales $ 639.6 $ 916.4 $ 1,209.5 $ 1,660.9
Percentage of Total Net Sales 11.80% 16.30% 11.70% 15.50%
Collaboration        
Disaggregation of Revenue [Line Items]        
Net sales $ 489.3 $ 533.6 $ 904.6 $ 1,009.6
Percentage of Total Net Sales 9.00% 9.50% 8.80% 9.40%
Data Storage and Servers        
Disaggregation of Revenue [Line Items]        
Net sales $ 546.6 $ 536.1 $ 1,087.2 $ 1,078.0
Percentage of Total Net Sales 10.10% 9.50% 10.60% 10.00%
Desktops        
Disaggregation of Revenue [Line Items]        
Net sales $ 295.5 $ 304.8 $ 553.9 $ 562.7
Percentage of Total Net Sales 5.40% 5.40% 5.40% 5.20%
Other Hardware        
Disaggregation of Revenue [Line Items]        
Net sales $ 652.7 $ 668.5 $ 1,273.3 $ 1,271.8
Percentage of Total Net Sales 12.10% 11.90% 12.30% 12.00%
Software        
Disaggregation of Revenue [Line Items]        
Net sales $ 855.6 $ 864.1 $ 1,730.0 $ 1,808.8
Percentage of Total Net Sales 15.80% 15.40% 16.80% 16.90%
Software | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales $ 416.2 $ 388.8 $ 853.7 $ 841.8
Software | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 53.5 58.6 113.4 114.8
Software | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 288.7 274.1 565.6 575.6
Software | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 97.2 142.6 197.3 276.6
Services        
Disaggregation of Revenue [Line Items]        
Net sales $ 478.4 $ 453.2 $ 904.2 $ 895.3
Percentage of Total Net Sales 8.80% 8.10% 8.80% 8.30%
Services | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales $ 231.2 $ 243.4 $ 449.2 $ 458.9
Services | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 17.7 15.5 34.3 31.2
Services | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 153.6 131.4 280.6 275.8
Services | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 75.9 62.9 140.1 129.4
Other        
Disaggregation of Revenue [Line Items]        
Net sales $ 27.5 $ 28.5 $ 53.9 $ 56.6
Percentage of Total Net Sales 0.50% 0.40% 0.50% 0.50%
Other | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales $ 15.6 $ 16.4 $ 30.4 $ 32.2
Other | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 4.4 4.6 8.8 9.4
Other | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 4.8 4.7 9.2 9.1
Other | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2.7 2.8 5.5 5.9
United States        
Disaggregation of Revenue [Line Items]        
Net sales 4,809.1 4,903.9 9,029.7 9,333.8
United States | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2,182.7 2,214.0 4,298.6 4,413.2
United States | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 376.9 390.7 752.9 800.3
United States | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2,242.0 2,293.8 3,964.8 4,106.4
United States | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 7.5 5.4 13.4 13.9
Rest of World        
Disaggregation of Revenue [Line Items]        
Net sales 614.3 722.2 1,266.4 1,395.4
Rest of World | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 12.5 31.0 32.5 35.5
Rest of World | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 6.0 5.5 10.9 7.3
Rest of World | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1.3 1.3 3.2 1.5
Rest of World | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales $ 594.5 $ 684.4 $ 1,219.8 $ 1,351.1