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Segment Information - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disaggregation of Revenue [Line Items]    
Total Net sales $ 5,679.8 $ 5,199.1
Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 3,569.4 3,255.3
Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 632.9 604.9
Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 675.0 658.5
Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 802.5 680.4
United States    
Disaggregation of Revenue [Line Items]    
Total Net sales 4,860.9 4,491.6
United States | Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 3,545.7 3,224.9
United States | Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 632.8 602.7
United States | Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 674.9 658.3
United States | Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 7.5 5.7
Rest of World    
Disaggregation of Revenue [Line Items]    
Total Net sales 818.9 707.5
Rest of World | Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 23.7 30.4
Rest of World | Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.1 2.2
Rest of World | Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.1 0.2
Rest of World | Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 795.0 674.7
Transferred at a point in time where CDW is principal    
Disaggregation of Revenue [Line Items]    
Total Net sales 4,886.4 4,416.4
Transferred at a point in time where CDW is principal | Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 3,032.8 2,731.7
Transferred at a point in time where CDW is principal | Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 541.4 506.4
Transferred at a point in time where CDW is principal | Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 618.7 603.7
Transferred at a point in time where CDW is principal | Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 693.5 574.6
Transferred at a point in time where CDW is agent    
Disaggregation of Revenue [Line Items]    
Total Net sales 410.7 410.2
Transferred at a point in time where CDW is agent | Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 297.1 297.9
Transferred at a point in time where CDW is agent | Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 44.5 43.0
Transferred at a point in time where CDW is agent | Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 29.8 28.2
Transferred at a point in time where CDW is agent | Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 39.3 41.1
Transferred over time where CDW is principal    
Disaggregation of Revenue [Line Items]    
Total Net sales 382.7 372.5
Transferred over time where CDW is principal | Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 239.5 225.7
Transferred over time where CDW is principal | Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 47.0 55.5
Transferred over time where CDW is principal | Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 26.5 26.6
Transferred over time where CDW is principal | Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 69.7 64.7
Corporate    
Disaggregation of Revenue [Line Items]    
Total Net sales 2,374.3 2,190.0
Corporate | Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 2,374.3 2,190.0
Corporate | Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Corporate | Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Corporate | Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Financial Services    
Disaggregation of Revenue [Line Items]    
Total Net sales 428.4 334.1
Financial Services | Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 428.4 334.1
Financial Services | Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Financial Services | Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Financial Services | Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Healthcare    
Disaggregation of Revenue [Line Items]    
Total Net sales 766.7 731.2
Healthcare | Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 766.7 731.2
Healthcare | Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Healthcare | Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Healthcare | Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 632.9 604.9
Government | Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Government | Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 632.9 604.9
Government | Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Government | Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 675.0 658.5
Education | Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Education | Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Education | Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 675.0 658.5
Education | Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 802.5 680.4
Other | Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Other | Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Other | Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.0 0.0
Other | Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 802.5 680.4
Hardware    
Disaggregation of Revenue [Line Items]    
Total Net sales 4,114.9 3,744.3
Hardware | Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 2,497.6 2,282.5
Hardware | Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 430.6 392.9
Hardware | Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 575.1 563.8
Hardware | Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 611.6 505.1
Software    
Disaggregation of Revenue [Line Items]    
Total Net sales 1,054.9 948.3
Software | Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 739.9 651.9
Software | Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 148.3 146.0
Software | Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 60.2 55.6
Software | Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 106.5 94.8
Services    
Disaggregation of Revenue [Line Items]    
Total Net sales 480.5 479.3
Services | Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 307.2 299.9
Services | Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 53.1 64.3
Services | Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 39.3 37.6
Services | Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 80.9 77.5
Other    
Disaggregation of Revenue [Line Items]    
Total Net sales 29.5 27.2
Other | Commercial    
Disaggregation of Revenue [Line Items]    
Total Net sales 24.7 21.0
Other | Government    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.9 1.7
Other | Education    
Disaggregation of Revenue [Line Items]    
Total Net sales 0.4 1.5
Other | Other    
Disaggregation of Revenue [Line Items]    
Total Net sales $ 3.5 $ 3.0