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Segment Information - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Net sales $ 5,146.4 $ 4,365.7 $ 9,983.9 $ 8,754.9
Percentage of Total Net Sales 100.00% 100.00% 100.00% 100.00%
Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,983.3 $ 1,557.5 $ 3,788.9 $ 3,468.5
Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 482.9 302.1 915.6 693.6
Public        
Disaggregation of Revenue [Line Items]        
Net sales 2,080.7 2,022.1 4,002.4 3,547.4
Other        
Disaggregation of Revenue [Line Items]        
Net sales 599.5 484.0 1,277.0 1,045.4
Transferred at a point in time where CDW is principal        
Disaggregation of Revenue [Line Items]        
Net sales 4,721.5 3,948.3 9,177.7 7,959.6
Transferred at a point in time where CDW is principal | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 1,789.2 1,387.2 3,416.9 3,128.2
Transferred at a point in time where CDW is principal | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 451.6 280.7 853.6 647.4
Transferred at a point in time where CDW is principal | Public        
Disaggregation of Revenue [Line Items]        
Net sales 1,953.5 1,854.2 3,779.4 3,258.8
Transferred at a point in time where CDW is principal | Other        
Disaggregation of Revenue [Line Items]        
Net sales 527.2 426.2 1,127.8 925.2
Transferred at a point in time where CDW is agent        
Disaggregation of Revenue [Line Items]        
Net sales 251.4 214.2 472.1 409.3
Transferred at a point in time where CDW is agent | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 120.7 112.2 233.0 219.8
Transferred at a point in time where CDW is agent | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 25.9 18.9 52.8 40.9
Transferred at a point in time where CDW is agent | Public        
Disaggregation of Revenue [Line Items]        
Net sales 85.0 68.3 143.1 120.6
Transferred at a point in time where CDW is agent | Other        
Disaggregation of Revenue [Line Items]        
Net sales 19.8 14.8 43.2 28.0
Transferred over time where CDW is principal        
Disaggregation of Revenue [Line Items]        
Net sales 173.5 203.2 334.1 386.0
Transferred over time where CDW is principal | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 73.4 58.1 139.0 120.5
Transferred over time where CDW is principal | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 5.4 2.5 9.2 5.3
Transferred over time where CDW is principal | Public        
Disaggregation of Revenue [Line Items]        
Net sales 42.2 99.6 79.9 168.0
Transferred over time where CDW is principal | Other        
Disaggregation of Revenue [Line Items]        
Net sales 52.5 43.0 106.0 92.2
Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 1,983.3 1,557.5 3,788.9 3,468.5
Corporate | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 1,983.3 1,557.5 3,788.9 3,468.5
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 482.9 302.1 915.6 693.6
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 482.9 302.1 915.6 693.6
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 513.4 719.7 1,029.5 1,288.2
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 513.4 719.7 1,029.5 1,288.2
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 1,112.1 876.8 2,055.4 1,353.0
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 1,112.1 876.8 2,055.4 1,353.0
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 455.2 425.6 917.5 906.2
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 455.2 425.6 917.5 906.2
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 599.5 484.0 1,277.0 1,045.4
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 599.5 484.0 1,277.0 1,045.4
Hardware        
Disaggregation of Revenue [Line Items]        
Net sales $ 4,225.6 $ 3,549.2 $ 8,195.2 $ 7,018.6
Percentage of Total Net Sales 82.10% 81.30% 82.10% 80.20%
Hardware | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,586.5 $ 1,211.6 $ 3,007.3 $ 2,729.5
Hardware | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 416.4 247.7 784.6 572.8
Hardware | Public        
Disaggregation of Revenue [Line Items]        
Net sales 1,763.9 1,724.8 3,431.8 2,940.0
Hardware | Other        
Disaggregation of Revenue [Line Items]        
Net sales 458.8 365.1 971.5 776.3
Notebooks/Mobile Devices        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,710.1 $ 1,427.7 $ 3,302.8 $ 2,538.2
Percentage of Total Net Sales 33.20% 32.70% 33.10% 29.00%
Netcomm Products        
Disaggregation of Revenue [Line Items]        
Net sales $ 483.8 $ 471.2 $ 938.4 $ 926.0
Percentage of Total Net Sales 9.40% 10.80% 9.40% 10.60%
Desktops        
Disaggregation of Revenue [Line Items]        
Net sales $ 293.7 $ 254.4 $ 558.9 $ 636.7
Percentage of Total Net Sales 5.70% 5.80% 5.60% 7.30%
Video        
Disaggregation of Revenue [Line Items]        
Net sales $ 410.5 $ 246.8 $ 736.5 $ 560.3
Percentage of Total Net Sales 8.00% 5.70% 7.40% 6.40%
Enterprise and Data Storage (Including Drives)        
Disaggregation of Revenue [Line Items]        
Net sales $ 242.5 $ 200.1 $ 502.1 $ 440.9
Percentage of Total Net Sales 4.70% 4.60% 5.00% 5.00%
Other Hardware        
Disaggregation of Revenue [Line Items]        
Net sales $ 1,085.0 $ 949.0 $ 2,156.5 $ 1,916.5
Percentage of Total Net Sales 21.10% 21.70% 21.60% 21.90%
Software        
Disaggregation of Revenue [Line Items]        
Net sales $ 637.8 $ 572.3 $ 1,243.3 $ 1,225.7
Percentage of Total Net Sales 12.40% 13.10% 12.50% 14.00%
Software | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 267.6 $ 238.9 $ 534.6 $ 511.1
Software | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 49.4 42.6 98.5 95.4
Software | Public        
Disaggregation of Revenue [Line Items]        
Net sales 242.5 222.5 433.9 457.6
Software | Other        
Disaggregation of Revenue [Line Items]        
Net sales 78.3 68.3 176.3 161.6
Services        
Disaggregation of Revenue [Line Items]        
Net sales $ 251.7 $ 214.8 $ 485.6 $ 445.4
Percentage of Total Net Sales 4.90% 4.90% 4.90% 5.10%
Services | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 110.9 $ 93.1 $ 213.5 $ 193.1
Services | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 11.3 7.1 21.5 15.4
Services | Public        
Disaggregation of Revenue [Line Items]        
Net sales 70.1 66.2 128.0 134.1
Services | Other        
Disaggregation of Revenue [Line Items]        
Net sales 59.4 48.4 122.6 102.8
Other        
Disaggregation of Revenue [Line Items]        
Net sales $ 31.3 $ 29.4 $ 59.8 $ 65.2
Percentage of Total Net Sales 0.60% 0.70% 0.50% 0.70%
Other | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales $ 18.3 $ 13.9 $ 33.5 $ 34.8
Other | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 5.8 4.7 11.0 10.0
Other | Public        
Disaggregation of Revenue [Line Items]        
Net sales 4.2 8.6 8.7 15.7
Other | Other        
Disaggregation of Revenue [Line Items]        
Net sales 3.0 2.2 6.6 4.7
United States        
Disaggregation of Revenue [Line Items]        
Net sales 4,544.5 3,870.9 8,707.0 7,701.7
United States | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 1,976.2 1,542.9 3,779.7 3,450.7
United States | Small Business        
Disaggregation of Revenue [Line Items]        
Net sales 482.9 302.1 915.6 693.6
United States | Public        
Disaggregation of Revenue [Line Items]        
Net sales 2,080.7 2,022.1 4,002.4 3,547.4
United States | Other        
Disaggregation of Revenue [Line Items]        
Net sales 4.7 3.8 9.3 10.0
Rest of World        
Disaggregation of Revenue [Line Items]        
Net sales 601.9 494.8 1,276.9 1,053.2
Rest of World | Corporate        
Disaggregation of Revenue [Line Items]        
Net sales 7.1 14.6 9.2 17.8
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 $ 594.8 $ 480.2 $ 1,267.7 $ 1,035.4