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Segment Information - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Net sales $ 4,756.4 $ 4,907.7 $ 13,511.3 $ 13,495.5
Percentage of Total Net Sales 100.00% 100.00% 100.00% 100.00%
Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,660.0 $ 1,913.5 $ 5,128.5 $ 5,533.6
Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 337.0 386.2 1,030.6 1,119.2
Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 2,293.8 2,100.9 5,841.2 5,271.7
Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 465.6 507.1 1,511.0 1,571.0
Transferred at a point in time where CDW is principal        
Disaggregation of Revenue [Line Items]        
Net sales 4,276.1 4,490.5 12,235.7 12,379.8
Transferred at a point in time where CDW is principal | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 1,474.2 1,743.4 4,602.4 5,033.4
Transferred at a point in time where CDW is principal | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 313.9 364.0 961.3 1,054.7
Transferred at a point in time where CDW is principal | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 2,080.3 1,939.3 5,339.1 4,908.0
Transferred at a point in time where CDW is principal | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 407.7 443.8 1,332.9 1,383.7
Transferred at a point in time where CDW is agent        
Disaggregation of Revenue [Line Items]        
Net sales 245.4 225.7 654.7 626.0
Transferred at a point in time where CDW is agent | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 121.3 111.0 341.1 333.7
Transferred at a point in time where CDW is agent | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 20.9 19.6 61.8 59.4
Transferred at a point in time where CDW is agent | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 89.3 79.6 209.9 190.9
Transferred at a point in time where CDW is agent | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 13.9 15.5 41.9 42.0
Transferred over time where CDW is principal        
Disaggregation of Revenue [Line Items]        
Net sales 234.9 191.5 620.9 489.7
Transferred over time where CDW is principal | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 64.5 59.1 185.0 166.5
Transferred over time where CDW is principal | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 2.2 2.6 7.5 5.1
Transferred over time where CDW is principal | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 124.2 82.0 292.2 172.8
Transferred over time where CDW is principal | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 44.0 47.8 136.2 145.3
Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 1,660.0 1,913.5 5,128.5 5,533.6
Corporate | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 1,660.0 1,913.5 5,128.5 5,533.6
Corporate | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Corporate | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Corporate | Operating Segments | 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 337.0 386.2 1,030.6 1,119.2
Small Business | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Small Business | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 337.0 386.2 1,030.6 1,119.2
Small Business | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Small Business | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Government        
Disaggregation of Revenue [Line Items]        
Net sales 847.7 793.4 2,135.9 1,860.2
Government | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Government | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Government | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 847.7 793.4 2,135.9 1,860.2
Government | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Education        
Disaggregation of Revenue [Line Items]        
Net sales 1,078.2 807.0 2,431.2 1,981.0
Education | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Education | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Education | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 1,078.2 807.0 2,431.2 1,981.0
Education | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Healthcare        
Disaggregation of Revenue [Line Items]        
Net sales 367.9 500.5 1,274.1 1,430.5
Healthcare | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Healthcare | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Healthcare | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 367.9 500.5 1,274.1 1,430.5
Healthcare | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Other        
Disaggregation of Revenue [Line Items]        
Net sales 465.6 507.1 1,511.0 1,571.0
Other | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Other | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Other | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Other | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 465.6 507.1 1,511.0 1,571.0
Hardware        
Disaggregation of Revenue [Line Items]        
Net sales $ 3,792.2 $ 3,941.2 $ 10,784.0 $ 10,822.5
Percentage of Total Net Sales 79.70% 80.20% 79.80% 80.20%
Hardware | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,252.0 $ 1,533.2 $ 3,978.4 $ 4,417.2
Hardware | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 281.7 326.7 853.7 938.3
Hardware | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 1,917.8 1,722.8 4,855.9 4,323.2
Hardware | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 340.7 358.5 1,096.0 1,143.8
Notebooks/Mobile Devices        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,384.7 $ 1,253.2 $ 3,923.1 $ 3,334.2
Percentage of Total Net Sales 29.10% 25.50% 29.00% 24.70%
Netcomm Products        
Disaggregation of Revenue [Line Items]        
Net sales $ 525.8 $ 566.7 $ 1,453.5 $ 1,639.7
Percentage of Total Net Sales 11.10% 11.50% 10.80% 12.10%
Desktops        
Disaggregation of Revenue [Line Items]        
Net sales $ 245.9 $ 433.2 $ 882.5 $ 1,148.6
Percentage of Total Net Sales 5.20% 8.80% 6.50% 8.50%
Video        
Disaggregation of Revenue [Line Items]        
Net sales $ 315.9 $ 353.4 $ 877.3 $ 973.2
Percentage of Total Net Sales 6.60% 7.20% 6.50% 7.20%
Enterprise and Data Storage (Including Drives)        
Disaggregation of Revenue [Line Items]        
Net sales $ 249.1 $ 283.8 $ 690.0 $ 850.8
Percentage of Total Net Sales 5.20% 5.80% 5.10% 6.30%
Other Hardware        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,070.8 $ 1,050.9 $ 2,957.6 $ 2,876.0
Percentage of Total Net Sales 22.50% 21.40% 21.90% 21.40%
Software        
Disaggregation of Revenue [Line Items]        
Net sales $ 706.1 $ 689.9 $ 1,941.8 $ 1,917.1
Percentage of Total Net Sales 14.80% 14.10% 14.40% 14.20%
Software | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 284.9 $ 263.6 $ 799.2 $ 777.4
Software | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 43.3 47.4 139.5 144.2
Software | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 304.7 313.2 764.3 783.1
Software | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 73.2 65.7 238.8 212.4
Services        
Disaggregation of Revenue [Line Items]        
Net sales $ 227.4 $ 243.8 $ 689.7 $ 662.9
Percentage of Total Net Sales 4.80% 5.00% 5.10% 4.90%
Services | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 107.1 $ 98.2 $ 300.0 $ 285.9
Services | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 7.0 6.7 22.4 20.7
Services | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 63.8 58.7 197.9 150.0
Services | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 49.5 80.2 169.4 206.3
Other        
Disaggregation of Revenue [Line Items]        
Net sales $ 30.7 $ 32.8 $ 95.8 $ 93.0
Percentage of Total Net Sales 0.70% 0.70% 0.70% 0.70%
Other | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 16.0 $ 18.5 $ 50.9 $ 53.1
Other | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 5.0 5.4 15.0 16.0
Other | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 7.5 6.2 23.1 15.4
Other | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 2.2 2.7 6.8 8.5
United States        
Disaggregation of Revenue [Line Items]        
Net sales 4,295.3 4,405.6 11,997.0 11,941.2
United States | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 1,658.4 1,910.9 5,109.1 5,525.5
United States | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 337.0 386.2 1,030.6 1,119.2
United States | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 2,293.8 2,100.9 5,841.2 5,271.7
United States | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 6.1 7.6 16.1 24.8
Rest of World        
Disaggregation of Revenue [Line Items]        
Net sales 461.1 502.1 1,514.3 1,554.3
Rest of World | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 1.6 2.6 19.4 8.1
Rest of World | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Rest of World | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Rest of World | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales $ 459.5 $ 499.5 $ 1,494.9 $ 1,546.2