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Segment Information - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disaggregation of Revenue [Line Items]    
Net sales $ 4,872.7 $ 5,103.1
Percentage of Total Net Sales 100.00% 100.00%
Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales $ 2,135.9 $ 2,203.7
Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 380.9 411.4
Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 1,724.7 1,812.8
Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 631.2 675.2
Transferred at a point in time where CDW is principal    
Disaggregation of Revenue [Line Items]    
Net sales 4,168.8 4,425.8
Transferred at a point in time where CDW is principal | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 1,779.3 1,861.4
Transferred at a point in time where CDW is principal | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 331.7 365.3
Transferred at a point in time where CDW is principal | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 1,515.7 1,608.6
Transferred at a point in time where CDW is principal | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 542.1 590.5
Transferred at a point in time where CDW is agent    
Disaggregation of Revenue [Line Items]    
Net sales 373.3 352.1
Transferred at a point in time where CDW is agent | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 194.8 185.4
Transferred at a point in time where CDW is agent | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 39.1 36.8
Transferred at a point in time where CDW is agent | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 108.2 101.5
Transferred at a point in time where CDW is agent | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 31.2 28.4
Transferred over time where CDW is principal    
Disaggregation of Revenue [Line Items]    
Net sales 330.6 325.2
Transferred over time where CDW is principal | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 161.8 156.9
Transferred over time where CDW is principal | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 10.1 9.3
Transferred over time where CDW is principal | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 100.8 102.7
Transferred over time where CDW is principal | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 57.9 56.3
Corporate    
Disaggregation of Revenue [Line Items]    
Net sales 2,135.9 2,203.7
Corporate | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 2,135.9 2,203.7
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 380.9 411.4
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 380.9 411.4
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 543.3 551.5
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 543.3 551.5
Government | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Education    
Disaggregation of Revenue [Line Items]    
Net sales 596.8 665.7
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 596.8 665.7
Education | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Healthcare    
Disaggregation of Revenue [Line Items]    
Net sales 584.6 595.6
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 584.6 595.6
Healthcare | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 0.0 0.0
Other    
Disaggregation of Revenue [Line Items]    
Net sales 631.2 675.2
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 631.2 675.2
Hardware    
Disaggregation of Revenue [Line Items]    
Net sales $ 3,546.1 $ 3,688.2
Percentage of Total Net Sales 72.80% 72.30%
Hardware | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales $ 1,465.6 $ 1,519.4
Hardware | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 300.0 334.7
Hardware | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 1,316.4 1,362.5
Hardware | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 464.1 471.6
Notebooks/Mobile Devices    
Disaggregation of Revenue [Line Items]    
Net sales $ 1,141.3 $ 1,064.6
Percentage of Total Net Sales 23.40% 20.90%
Netcomm Products    
Disaggregation of Revenue [Line Items]    
Net sales $ 569.9 $ 744.5
Percentage of Total Net Sales 11.70% 14.60%
Collaboration    
Disaggregation of Revenue [Line Items]    
Net sales $ 415.3 $ 476.0
Percentage of Total Net Sales 8.50% 9.30%
Data Storage and Servers    
Disaggregation of Revenue [Line Items]    
Net sales $ 540.6 $ 541.9
Percentage of Total Net Sales 11.10% 10.60%
Desktops    
Disaggregation of Revenue [Line Items]    
Net sales $ 258.4 $ 257.9
Percentage of Total Net Sales 5.30% 5.10%
Other Hardware    
Disaggregation of Revenue [Line Items]    
Net sales $ 620.6 $ 603.3
Percentage of Total Net Sales 12.80% 11.80%
Software    
Disaggregation of Revenue [Line Items]    
Net sales $ 874.4 $ 944.7
Percentage of Total Net Sales 17.90% 18.50%
Software | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales $ 437.5 $ 453.0
Software | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 59.9 56.2
Software | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 276.9 301.5
Software | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 100.1 134.0
Services    
Disaggregation of Revenue [Line Items]    
Net sales $ 425.8 $ 442.1
Percentage of Total Net Sales 8.70% 8.70%
Services | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales $ 218.0 $ 215.5
Services | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 16.6 15.7
Services | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 127.0 144.4
Services | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 64.2 66.5
Other    
Disaggregation of Revenue [Line Items]    
Net sales $ 26.4 $ 28.1
Percentage of Total Net Sales 0.60% 0.50%
Other | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales $ 14.8 $ 15.8
Other | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 4.4 4.8
Other | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 4.4 4.4
Other | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 2.8 3.1
United States    
Disaggregation of Revenue [Line Items]    
Net sales 4,220.6 4,429.9
United States | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 2,115.9 2,199.2
United States | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 376.0 409.6
United States | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 1,722.8 1,812.6
United States | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 5.9 8.5
Rest of World    
Disaggregation of Revenue [Line Items]    
Net sales 652.1 673.2
Rest of World | Corporate | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 20.0 4.5
Rest of World | Small Business | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 4.9 1.8
Rest of World | Public | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales 1.9 0.2
Rest of World | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales $ 625.3 $ 666.7