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Segment Information - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Net sales $ 5,300.0 $ 4,756.4 $ 15,283.9 $ 13,511.3
Percentage of Total Net Sales 100.00% 100.00% 100.00% 100.00%
Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 2,067.3 $ 1,660.0 $ 5,856.2 $ 5,128.5
Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 467.1 337.0 1,382.7 1,030.6
Public        
Disaggregation of Revenue [Line Items]        
Net sales 2,153.9 2,293.8 6,156.3 5,841.2
Other        
Disaggregation of Revenue [Line Items]        
Net sales 611.7 465.6 1,888.7 1,511.0
Transferred at a point in time where CDW is principal        
Disaggregation of Revenue [Line Items]        
Net sales 4,813.0 4,276.1 13,990.7 12,235.7
Transferred at a point in time where CDW is principal | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 1,851.0 1,474.2 5,267.9 4,602.4
Transferred at a point in time where CDW is principal | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 434.6 313.9 1,288.2 961.3
Transferred at a point in time where CDW is principal | Public        
Disaggregation of Revenue [Line Items]        
Net sales 1,984.8 2,080.3 5,764.2 5,339.1
Transferred at a point in time where CDW is principal | Other        
Disaggregation of Revenue [Line Items]        
Net sales 542.6 407.7 1,670.4 1,332.9
Transferred at a point in time where CDW is agent        
Disaggregation of Revenue [Line Items]        
Net sales 288.8 245.4 760.9 654.7
Transferred at a point in time where CDW is agent | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 135.6 121.3 368.6 341.1
Transferred at a point in time where CDW is agent | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 27.8 20.9 80.6 61.8
Transferred at a point in time where CDW is agent | Public        
Disaggregation of Revenue [Line Items]        
Net sales 109.1 89.3 252.2 209.9
Transferred at a point in time where CDW is agent | Other        
Disaggregation of Revenue [Line Items]        
Net sales 16.3 13.9 59.5 41.9
Transferred over time where CDW is principal        
Disaggregation of Revenue [Line Items]        
Net sales 198.2 234.9 532.3 620.9
Transferred over time where CDW is principal | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 80.7 64.5 219.7 185.0
Transferred over time where CDW is principal | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 4.7 2.2 13.9 7.5
Transferred over time where CDW is principal | Public        
Disaggregation of Revenue [Line Items]        
Net sales 60.0 124.2 139.9 292.2
Transferred over time where CDW is principal | Other        
Disaggregation of Revenue [Line Items]        
Net sales 52.8 44.0 158.8 136.2
Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 2,067.3 1,660.0 5,856.2 5,128.5
Corporate | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 2,067.3 1,660.0 5,856.2 5,128.5
Corporate | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Corporate | Public        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Corporate | Other        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 467.1 337.0 1,382.7 1,030.6
Small Business | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Small Business | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 467.1 337.0 1,382.7 1,030.6
Small Business | Public        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Small Business | Other        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Government        
Disaggregation of Revenue [Line Items]        
Net sales 568.8 847.7 1,598.3 2,135.9
Government | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Government | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Government | Public        
Disaggregation of Revenue [Line Items]        
Net sales 568.8 847.7 1,598.3 2,135.9
Government | Other        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Education        
Disaggregation of Revenue [Line Items]        
Net sales 1,103.6 1,078.2 3,159.0 2,431.2
Education | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Education | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Education | Public        
Disaggregation of Revenue [Line Items]        
Net sales 1,103.6 1,078.2 3,159.0 2,431.2
Education | Other        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Healthcare        
Disaggregation of Revenue [Line Items]        
Net sales 481.5 367.9 1,399.0 1,274.1
Healthcare | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Healthcare | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Healthcare | Public        
Disaggregation of Revenue [Line Items]        
Net sales 481.5 367.9 1,399.0 1,274.1
Healthcare | Other        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Other        
Disaggregation of Revenue [Line Items]        
Net sales 611.7 465.6 1,888.7 1,511.0
Other | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Other | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Other | Public        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Other | Other        
Disaggregation of Revenue [Line Items]        
Net sales 611.7 465.6 1,888.7 1,511.0
Hardware        
Disaggregation of Revenue [Line Items]        
Net sales $ 4,263.7 $ 3,807.3 $ 12,460.3 $ 10,826.9
Percentage of Total Net Sales 80.50% 80.00% 81.40% 80.10%
Hardware | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,641.2 $ 1,256.7 $ 4,648.6 $ 3,986.2
Hardware | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 400.7 282.2 1,185.3 855.1
Hardware | Public        
Disaggregation of Revenue [Line Items]        
Net sales 1,747.3 1,924.2 5,180.5 4,864.5
Hardware | Other        
Disaggregation of Revenue [Line Items]        
Net sales 474.5 344.2 1,445.9 1,121.1
Notebooks/Mobile Devices        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,641.6 $ 1,384.0 $ 4,944.3 $ 3,922.2
Percentage of Total Net Sales 31.00% 29.10% 32.30% 29.00%
Netcomm Products        
Disaggregation of Revenue [Line Items]        
Net sales $ 501.7 $ 524.4 $ 1,442.2 $ 1,450.4
Percentage of Total Net Sales 9.50% 11.00% 9.40% 10.70%
Desktops        
Disaggregation of Revenue [Line Items]        
Net sales $ 316.1 $ 245.3 $ 873.5 $ 881.3
Percentage of Total Net Sales 6.00% 5.20% 5.70% 6.50%
Video        
Disaggregation of Revenue [Line Items]        
Net sales $ 424.0 $ 316.3 $ 1,161.7 $ 877.0
Percentage of Total Net Sales 8.00% 6.60% 7.60% 6.50%
Enterprise and Data Storage (Including Drives)        
Disaggregation of Revenue [Line Items]        
Net sales $ 228.1 $ 247.9 $ 730.2 $ 688.8
Percentage of Total Net Sales 4.30% 5.20% 4.80% 5.10%
Other Hardware        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,152.2 $ 1,089.4 $ 3,308.4 $ 3,007.2
Percentage of Total Net Sales 21.70% 22.90% 21.60% 22.30%
Software        
Disaggregation of Revenue [Line Items]        
Net sales $ 717.7 $ 691.5 $ 1,959.2 $ 1,915.5
Percentage of Total Net Sales 13.50% 14.50% 12.80% 14.20%
Software | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 279.3 $ 280.8 $ 813.9 $ 791.8
Software | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 50.2 42.7 148.7 138.0
Software | Public        
Disaggregation of Revenue [Line Items]        
Net sales 312.9 298.2 745.4 755.7
Software | Other        
Disaggregation of Revenue [Line Items]        
Net sales 75.3 69.8 251.2 230.0
Services        
Disaggregation of Revenue [Line Items]        
Net sales $ 286.9 $ 226.9 $ 772.4 $ 672.1
Percentage of Total Net Sales 5.40% 4.80% 5.10% 5.00%
Services | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 128.5 $ 106.5 $ 342.0 $ 299.6
Services | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 10.4 7.1 31.9 22.4
Services | Public        
Disaggregation of Revenue [Line Items]        
Net sales 89.2 63.9 217.2 197.9
Services | Other        
Disaggregation of Revenue [Line Items]        
Net sales 58.8 49.4 181.3 152.2
Other        
Disaggregation of Revenue [Line Items]        
Net sales $ 31.7 $ 30.7 $ 92.0 $ 96.8
Percentage of Total Net Sales 0.60% 0.70% 0.70% 0.70%
Other | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 18.3 $ 16.0 $ 51.7 $ 50.9
Other | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 5.8 5.0 16.8 15.1
Other | Public        
Disaggregation of Revenue [Line Items]        
Net sales 4.5 7.5 13.2 23.1
Other | Other        
Disaggregation of Revenue [Line Items]        
Net sales 3.1 2.2 10.3 7.7
United States        
Disaggregation of Revenue [Line Items]        
Net sales 4,691.0 4,295.3 13,398.0 11,997.0
United States | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 2,064.6 1,658.4 5,844.3 5,109.1
United States | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 467.1 337.0 1,382.7 1,030.6
United States | Public        
Disaggregation of Revenue [Line Items]        
Net sales 2,153.9 2,293.8 6,156.3 5,841.2
United States | Other        
Disaggregation of Revenue [Line Items]        
Net sales 5.4 6.1 14.7 16.1
Rest of World        
Disaggregation of Revenue [Line Items]        
Net sales 609.0 461.1 1,885.9 1,514.3
Rest of World | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 2.7 1.6 11.9 19.4
Rest of World | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Rest of World | Public        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Rest of World | Other        
Disaggregation of Revenue [Line Items]        
Net sales $ 606.3 $ 459.5 $ 1,874.0 $ 1,494.9