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Segment Information - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Net sales $ 5,626.1 $ 6,145.8 $ 10,729.2 $ 12,094.9
Percentage of Total Net Sales 100.00% 100.00% 100.00% 100.00%
Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales $ 2,245.0 $ 2,660.7 $ 4,448.7 $ 5,288.3
Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 396.2 500.0 807.6 1,024.0
Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2,295.1 2,243.0 4,107.9 4,276.0
Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 689.8 742.1 1,365.0 1,506.6
Transferred at a point in time where CDW is principal        
Disaggregation of Revenue [Line Items]        
Net sales 4,934.2 5,477.1 9,360.0 10,765.7
Transferred at a point in time where CDW is principal | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1,891.3 2,325.9 3,752.7 4,617.1
Transferred at a point in time where CDW is principal | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 354.9 456.2 720.2 936.2
Transferred at a point in time where CDW is principal | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2,080.7 2,032.4 3,689.3 3,872.7
Transferred at a point in time where CDW is principal | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 607.3 662.6 1,197.8 1,339.7
Transferred at a point in time where CDW is agent        
Disaggregation of Revenue [Line Items]        
Net sales 361.3 328.5 713.4 669.2
Transferred at a point in time where CDW is agent | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 185.0 172.3 370.4 352.9
Transferred at a point in time where CDW is agent | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 32.9 33.4 69.7 67.7
Transferred at a point in time where CDW is agent | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 116.7 103.5 218.2 199.8
Transferred at a point in time where CDW is agent | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 26.7 19.3 55.1 48.8
Transferred over time where CDW is principal        
Disaggregation of Revenue [Line Items]        
Net sales 330.6 340.2 655.8 660.0
Transferred over time where CDW is principal | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 168.7 162.5 325.6 318.3
Transferred over time where CDW is principal | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 8.4 10.4 17.7 20.1
Transferred over time where CDW is principal | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 97.7 107.1 200.4 203.5
Transferred over time where CDW is principal | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 55.8 60.2 112.1 118.1
Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 2,245.0 2,660.7 4,448.7 5,288.3
Corporate | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2,245.0 2,660.7 4,448.7 5,288.3
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 396.2 500.0 807.6 1,024.0
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 396.2 500.0 807.6 1,024.0
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 681.2 609.5 1,232.7 1,153.4
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 681.2 609.5 1,232.7 1,153.4
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 1,026.8 1,041.3 1,692.5 1,944.1
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 1,026.8 1,041.3 1,692.5 1,944.1
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 587.1 592.2 1,182.7 1,178.5
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 587.1 592.2 1,182.7 1,178.5
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 689.8 742.1 1,365.0 1,506.6
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 689.8 742.1 1,365.0 1,506.6
Hardware        
Disaggregation of Revenue [Line Items]        
Net sales $ 4,280.3 $ 4,721.9 $ 7,968.5 $ 9,404.0
Percentage of Total Net Sales 76.10% 76.90% 74.30% 77.90%
Hardware | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,596.4 $ 1,989.3 $ 3,115.8 $ 3,972.9
Hardware | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 317.5 419.7 652.2 863.2
Hardware | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1,884.9 1,797.1 3,247.4 3,443.4
Hardware | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 481.5 515.8 953.1 1,124.5
Notebooks/Mobile Devices        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,320.9 $ 1,763.6 $ 2,385.5 $ 3,477.4
Percentage of Total Net Sales 23.50% 28.70% 22.20% 28.80%
Netcomm Products        
Disaggregation of Revenue [Line Items]        
Net sales $ 916.4 $ 623.9 $ 1,660.9 $ 1,191.6
Percentage of Total Net Sales 16.30% 10.20% 15.50% 9.90%
Collaboration        
Disaggregation of Revenue [Line Items]        
Net sales $ 533.6 $ 691.6 $ 1,009.6 $ 1,320.9
Percentage of Total Net Sales 9.50% 11.30% 9.40% 10.90%
Data Storage and Servers        
Disaggregation of Revenue [Line Items]        
Net sales $ 536.1 $ 626.5 $ 1,078.0 $ 1,247.3
Percentage of Total Net Sales 9.50% 10.20% 10.00% 10.30%
Desktops        
Disaggregation of Revenue [Line Items]        
Net sales $ 304.8 $ 350.2 $ 562.7 $ 687.6
Percentage of Total Net Sales 5.40% 5.70% 5.20% 5.70%
Other Hardware        
Disaggregation of Revenue [Line Items]        
Net sales $ 668.5 $ 666.1 $ 1,271.8 $ 1,479.2
Percentage of Total Net Sales 11.90% 10.80% 12.00% 12.30%
Software        
Disaggregation of Revenue [Line Items]        
Net sales $ 864.1 $ 920.9 $ 1,808.8 $ 1,719.4
Percentage of Total Net Sales 15.40% 15.00% 16.90% 14.20%
Software | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales $ 388.8 $ 423.0 $ 841.8 $ 822.8
Software | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 58.6 55.0 114.8 114.8
Software | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 274.1 288.7 575.6 542.0
Software | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 142.6 154.2 276.6 239.8
Services        
Disaggregation of Revenue [Line Items]        
Net sales $ 453.2 $ 469.7 $ 895.3 $ 907.1
Percentage of Total Net Sales 8.10% 7.60% 8.30% 7.50%
Services | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales $ 243.4 $ 228.9 $ 458.9 $ 454.2
Services | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 15.5 19.8 31.2 34.9
Services | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 131.4 152.4 275.8 281.5
Services | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 62.9 68.6 129.4 136.5
Other        
Disaggregation of Revenue [Line Items]        
Net sales $ 28.5 $ 33.3 $ 56.6 $ 64.4
Percentage of Total Net Sales 0.40% 0.50% 0.50% 0.40%
Other | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales $ 16.4 $ 19.5 $ 32.2 $ 38.4
Other | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 4.6 5.5 9.4 11.1
Other | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 4.7 4.8 9.1 9.1
Other | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2.8 3.5 5.9 5.8
United States        
Disaggregation of Revenue [Line Items]        
Net sales 4,903.9 5,402.5 9,333.8 10,580.9
United States | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2,214.0 2,655.4 4,413.2 5,272.2
United States | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 390.7 500.0 800.3 1,024.0
United States | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2,293.8 2,243.0 4,106.4 4,276.0
United States | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 5.4 4.1 13.9 8.7
Rest of World        
Disaggregation of Revenue [Line Items]        
Net sales 722.2 743.3 1,395.4 1,514.0
Rest of World | Corporate | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 31.0 5.3 35.5 16.1
Rest of World | Small Business | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 5.5 0.0 7.3 0.0
Rest of World | Public | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1.3 0.0 1.5 0.0
Rest of World | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales $ 684.4 $ 738.0 $ 1,351.1 $ 1,497.9