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Segment Information - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Net sales $ 4,365.7 $ 4,629.9 $ 8,754.9 $ 8,587.8
Percentage of Total Net Sales 100.00% 100.00% 100.00% 100.00%
Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,557.5 $ 1,883.9 $ 3,468.5 $ 3,620.1
Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 302.1 377.4 693.6 733.0
Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 2,022.1 1,840.1 3,547.4 3,170.8
Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 484.0 528.5 1,045.4 1,063.9
Transferred at a point in time where CDW is principal        
Disaggregation of Revenue [Line Items]        
Net sales 3,948.3 4,254.2 7,959.6 7,889.3
Transferred at a point in time where CDW is principal | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 1,387.2 1,708.2 3,128.2 3,290.0
Transferred at a point in time where CDW is principal | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 280.7 355.5 647.4 690.7
Transferred at a point in time where CDW is principal | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 1,854.2 1,725.5 3,258.8 2,968.7
Transferred at a point in time where CDW is principal | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 426.2 465.0 925.2 939.9
Transferred at a point in time where CDW is agent        
Disaggregation of Revenue [Line Items]        
Net sales 214.2 217.2 409.3 400.3
Transferred at a point in time where CDW is agent | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 112.2 118.7 219.8 222.7
Transferred at a point in time where CDW is agent | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 18.9 20.0 40.9 39.8
Transferred at a point in time where CDW is agent | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 68.3 65.0 120.6 111.3
Transferred at a point in time where CDW is agent | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 14.8 13.5 28.0 26.5
Transferred over time where CDW is principal        
Disaggregation of Revenue [Line Items]        
Net sales 203.2 158.5 386.0 298.2
Transferred over time where CDW is principal | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 58.1 57.0 120.5 107.4
Transferred over time where CDW is principal | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 2.5 1.9 5.3 2.5
Transferred over time where CDW is principal | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 99.6 49.6 168.0 90.8
Transferred over time where CDW is principal | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 43.0 50.0 92.2 97.5
Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 1,557.5 1,883.9 3,468.5 3,620.1
Corporate | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 1,557.5 1,883.9 3,468.5 3,620.1
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 302.1 377.4 693.6 733.0
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 302.1 377.4 693.6 733.0
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 719.7 578.4 1,288.2 1,066.8
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 719.7 578.4 1,288.2 1,066.8
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 876.8 773.6 1,353.0 1,174.0
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 876.8 773.6 1,353.0 1,174.0
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 425.6 488.1 906.2 930.0
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 425.6 488.1 906.2 930.0
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 484.0 528.5 1,045.4 1,063.9
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 484.0 528.5 1,045.4 1,063.9
Hardware        
Disaggregation of Revenue [Line Items]        
Net sales $ 3,539.0 $ 3,737.4 $ 6,997.1 $ 6,885.1
Percentage of Total Net Sales 81.10% 80.70% 79.90% 80.10%
Hardware | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,207.5 $ 1,497.2 $ 2,722.6 $ 2,882.5
Hardware | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 247.0 316.0 571.8 611.2
Hardware | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 1,719.6 1,523.5 2,930.3 2,587.6
Hardware | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 364.9 400.7 772.4 803.8
Notebooks/Mobile Devices        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,428.2 $ 1,164.6 $ 2,539.3 $ 2,080.6
Percentage of Total Net Sales 32.70% 25.20% 29.00% 24.20%
Netcomm Products        
Disaggregation of Revenue [Line Items]        
Net sales $ 471.9 $ 562.5 $ 928.1 $ 1,073.7
Percentage of Total Net Sales 10.80% 12.10% 10.60% 12.50%
Desktops        
Disaggregation of Revenue [Line Items]        
Net sales $ 253.6 $ 418.3 $ 635.6 $ 715.5
Percentage of Total Net Sales 5.80% 9.00% 7.30% 8.30%
Video        
Disaggregation of Revenue [Line Items]        
Net sales $ 248.0 $ 348.1 $ 561.8 $ 619.2
Percentage of Total Net Sales 5.70% 7.50% 6.40% 7.20%
Enterprise and Data Storage (Including Drives)        
Disaggregation of Revenue [Line Items]        
Net sales $ 199.9 $ 273.1 $ 440.3 $ 566.2
Percentage of Total Net Sales 4.60% 5.90% 5.00% 6.60%
Other Hardware        
Disaggregation of Revenue [Line Items]        
Net sales $ 937.4 $ 970.8 $ 1,892.0 $ 1,829.9
Percentage of Total Net Sales 21.50% 21.00% 21.60% 21.30%
Software        
Disaggregation of Revenue [Line Items]        
Net sales $ 582.4 $ 650.6 $ 1,247.2 $ 1,242.1
Percentage of Total Net Sales 13.30% 14.10% 14.20% 14.50%
Software | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 243.2 $ 269.2 $ 518.0 $ 515.2
Software | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 43.2 49.1 96.5 97.2
Software | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 227.4 262.6 467.1 482.8
Software | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 68.6 69.7 165.6 146.9
Services        
Disaggregation of Revenue [Line Items]        
Net sales $ 214.6 $ 211.3 $ 445.1 $ 400.5
Percentage of Total Net Sales 4.90% 4.60% 5.10% 4.70%
Services | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 92.8 $ 99.8 $ 192.9 $ 187.8
Services | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 7.1 7.0 15.3 14.0
Services | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 66.4 49.2 134.2 91.4
Services | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 48.3 55.3 102.7 107.3
Other        
Disaggregation of Revenue [Line Items]        
Net sales $ 29.7 $ 30.6 $ 65.5 $ 60.1
Percentage of Total Net Sales 0.70% 0.60% 0.80% 0.70%
Other | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 14.0 $ 17.7 $ 35.0 $ 34.6
Other | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 4.8 5.3 10.0 10.6
Other | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 8.7 4.8 15.8 9.0
Other | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 2.2 2.8 4.7 5.9
United States        
Disaggregation of Revenue [Line Items]        
Net sales 3,870.9 4,108.1 7,701.7 7,535.6
United States | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 1,542.9 1,881.7 3,450.7 3,614.6
United States | Operating Segments | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 302.1 377.4 693.6 733.0
United States | Operating Segments | Public        
Disaggregation of Revenue [Line Items]        
Net sales 2,022.1 1,840.1 3,547.4 3,170.8
United States | Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 3.8 8.9 10.0 17.2
Rest of World        
Disaggregation of Revenue [Line Items]        
Net sales 494.8 521.8 1,053.2 1,052.2
Rest of World | Operating Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 14.6 2.2 17.8 5.5
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 $ 480.2 $ 519.6 $ 1,035.4 $ 1,046.7