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Segment Information - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]    
Net sales $ 5,103.1 $ 5,949.1
Percentage of Total Net Sales 100.00% 100.00%
Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales $ 2,203.7 $ 2,627.6
Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 411.4 524.0
Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 1,812.8 2,033.0
Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 675.2 764.5
Transferred at a point in time where CDW is principal    
Disaggregation of Revenue [Line Items]    
Net sales 4,425.8 5,288.6
Transferred at a point in time where CDW is principal | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 1,861.4 2,291.2
Transferred at a point in time where CDW is principal | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 365.3 480.0
Transferred at a point in time where CDW is principal | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 1,608.6 1,840.3
Transferred at a point in time where CDW is principal | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 590.5 677.1
Transferred at a point in time where CDW is agent    
Disaggregation of Revenue [Line Items]    
Net sales 352.1 340.7
Transferred at a point in time where CDW is agent | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 185.4 180.6
Transferred at a point in time where CDW is agent | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 36.8 34.3
Transferred at a point in time where CDW is agent | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 101.5 96.3
Transferred at a point in time where CDW is agent | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 28.4 29.5
Transferred over time where CDW is principal    
Disaggregation of Revenue [Line Items]    
Net sales 325.2 319.8
Transferred over time where CDW is principal | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 156.9 155.8
Transferred over time where CDW is principal | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 9.3 9.7
Transferred over time where CDW is principal | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 102.7 96.4
Transferred over time where CDW is principal | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 56.3 57.9
Corporate    
Disaggregation of Revenue [Line Items]    
Net sales 2,203.7 2,627.6
Corporate | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 2,203.7 2,627.6
Corporate | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Corporate | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Corporate | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Small Business    
Disaggregation of Revenue [Line Items]    
Net sales 411.4 524.0
Small Business | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Small Business | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 411.4 524.0
Small Business | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Small Business | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Government    
Disaggregation of Revenue [Line Items]    
Net sales 551.5 543.9
Government | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Government | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Government | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 551.5 543.9
Government | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Education    
Disaggregation of Revenue [Line Items]    
Net sales 665.7 902.8
Education | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Education | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Education | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 665.7 902.8
Education | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Healthcare    
Disaggregation of Revenue [Line Items]    
Net sales 595.6 586.3
Healthcare | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Healthcare | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Healthcare | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 595.6 586.3
Healthcare | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Other    
Disaggregation of Revenue [Line Items]    
Net sales 675.2 764.5
Other | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Other | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Other | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Other | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 675.2 764.5
Hardware    
Disaggregation of Revenue [Line Items]    
Net sales $ 3,688.2 $ 4,682.1
Percentage of Total Net Sales 72.30% 78.70%
Hardware | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales $ 1,519.4 $ 1,983.6
Hardware | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 334.7 443.5
Hardware | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 1,362.5 1,646.3
Hardware | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 471.6 608.7
Notebooks/Mobile Devices    
Disaggregation of Revenue [Line Items]    
Net sales $ 1,064.6 $ 1,713.8
Percentage of Total Net Sales 20.90% 28.80%
Netcomm Products    
Disaggregation of Revenue [Line Items]    
Net sales $ 744.5 $ 567.7
Percentage of Total Net Sales 14.60% 9.50%
Desktops    
Disaggregation of Revenue [Line Items]    
Net sales $ 257.9 $ 337.5
Percentage of Total Net Sales 5.10% 5.70%
Collaboration    
Disaggregation of Revenue [Line Items]    
Net sales $ 476.0 $ 629.3
Percentage of Total Net Sales 9.30% 10.60%
Data Storage and Servers    
Disaggregation of Revenue [Line Items]    
Net sales $ 541.9 $ 620.8
Percentage of Total Net Sales 10.60% 10.40%
Other Hardware    
Disaggregation of Revenue [Line Items]    
Net sales $ 603.3 $ 813.0
Percentage of Total Net Sales 11.80% 13.70%
Software    
Disaggregation of Revenue [Line Items]    
Net sales $ 944.7 $ 798.4
Percentage of Total Net Sales 18.50% 13.40%
Software | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales $ 453.0 $ 399.8
Software | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 56.2 59.8
Software | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 301.5 253.2
Software | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 134.0 85.6
Services    
Disaggregation of Revenue [Line Items]    
Net sales $ 442.1 $ 437.5
Percentage of Total Net Sales 8.70% 7.40%
Services | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales $ 215.5 $ 225.3
Services | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 15.7 15.1
Services | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 144.4 129.2
Services | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 66.5 67.9
Other    
Disaggregation of Revenue [Line Items]    
Net sales $ 28.1 $ 31.1
Percentage of Total Net Sales 0.50% 0.50%
Other | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales $ 15.8 $ 18.9
Other | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 4.8 5.6
Other | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 4.4 4.3
Other | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 3.1 2.3
United States    
Disaggregation of Revenue [Line Items]    
Net sales 4,429.9 5,178.4
United States | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 2,199.2 2,616.8
United States | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 409.6 524.0
United States | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 1,812.6 2,033.0
United States | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 8.5 4.6
Rest of World    
Disaggregation of Revenue [Line Items]    
Net sales 673.2 770.7
Rest of World | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 4.5 10.8
Rest of World | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 1.8 0.0
Rest of World | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.2 0.0
Rest of World | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales $ 666.7 $ 759.9