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Segment Information - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Total Net sales $ 6,572.2 $ 5,976.6 $ 12,252.0 $ 11,175.7
Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 3,965.4 3,631.3 7,534.8 6,886.6
Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 848.0 746.6 1,480.9 1,351.5
Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 933.1 926.6 1,608.1 1,585.1
Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 825.7 672.1 1,628.2 1,352.5
Transferred at a point in time where CDW is principal        
Disaggregation of Revenue [Line Items]        
Total Net sales 5,698.9 5,162.6 10,585.3 9,579.0
Transferred at a point in time where CDW is principal | Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 3,401.6 3,116.5 6,434.4 5,848.2
Transferred at a point in time where CDW is principal | Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 723.5 625.2 1,264.9 1,131.6
Transferred at a point in time where CDW is principal | Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 858.5 860.8 1,477.2 1,464.5
Transferred at a point in time where CDW is principal | Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 715.3 560.1 1,408.8 1,134.7
Transferred at a point in time where CDW is agent        
Disaggregation of Revenue [Line Items]        
Total Net sales 474.2 408.4 884.9 818.6
Transferred at a point in time where CDW is agent | Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 324.7 277.5 621.8 575.4
Transferred at a point in time where CDW is agent | Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 59.0 51.8 103.5 94.8
Transferred at a point in time where CDW is agent | Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 45.3 36.6 75.1 64.8
Transferred at a point in time where CDW is agent | Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 45.2 42.5 84.5 83.6
Transferred over time where CDW is principal        
Disaggregation of Revenue [Line Items]        
Total Net sales 399.1 405.6 781.8 778.1
Transferred over time where CDW is principal | Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 239.1 237.3 478.6 463.0
Transferred over time where CDW is principal | Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 65.5 69.6 112.5 125.1
Transferred over time where CDW is principal | Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 29.3 29.2 55.8 55.8
Transferred over time where CDW is principal | Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 65.2 69.5 134.9 134.2
Corporate        
Disaggregation of Revenue [Line Items]        
Total Net sales 2,618.1 2,364.4 4,992.4 4,554.4
Corporate | Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 2,618.1 2,364.4 4,992.4 4,554.4
Corporate | Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Corporate | Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Corporate | Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Financial Services        
Disaggregation of Revenue [Line Items]        
Total Net sales 487.1 478.6 915.5 812.7
Financial Services | Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 487.1 478.6 915.5 812.7
Financial Services | Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Financial Services | Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Financial Services | Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Healthcare        
Disaggregation of Revenue [Line Items]        
Total Net sales 860.2 788.3 1,626.9 1,519.5
Healthcare | Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 860.2 788.3 1,626.9 1,519.5
Healthcare | Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Healthcare | Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Healthcare | Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 848.0 746.6 1,480.9 1,351.5
Government | Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Government | Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 848.0 746.6 1,480.9 1,351.5
Government | Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Government | Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 933.1 926.6 1,608.1 1,585.1
Education | Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Education | Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Education | Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 933.1 926.6 1,608.1 1,585.1
Education | Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 825.7 672.1 1,628.2 1,352.5
Other | Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Other | Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Other | Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.0 0.0
Other | Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 825.7 672.1 1,628.2 1,352.5
Hardware        
Disaggregation of Revenue [Line Items]        
Total Net sales 4,905.0 4,442.0 9,019.9 8,186.3
Hardware | Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 2,903.7 2,646.8 5,401.3 4,929.3
Hardware | Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 579.4 505.2 1,010.0 898.1
Hardware | Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 794.9 813.2 1,370.0 1,377.0
Hardware | Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 627.0 476.8 1,238.6 981.9
Software        
Disaggregation of Revenue [Line Items]        
Total Net sales 1,114.3 990.2 2,169.2 1,938.5
Software | Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 719.1 651.8 1,459.0 1,303.7
Software | Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 187.4 158.2 335.7 304.2
Software | Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 90.9 70.8 151.1 126.4
Software | Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 116.9 109.4 223.4 204.2
Services        
Disaggregation of Revenue [Line Items]        
Total Net sales 520.7 515.2 1,001.2 994.5
Services | Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 316.2 311.4 623.4 611.3
Services | Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 79.9 81.6 133.0 145.9
Services | Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 46.7 40.8 86.0 78.4
Services | Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 77.9 81.4 158.8 158.9
Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 32.2 29.2 61.7 56.4
Other | Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 26.4 21.3 51.1 42.3
Other | Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 1.3 1.6 2.2 3.3
Other | Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.6 1.8 1.0 3.3
Other | Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 3.9 4.5 7.4 7.5
United States        
Disaggregation of Revenue [Line Items]        
Total Net sales 5,732.8 5,278.6 10,593.7 9,770.2
United States | Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 3,942.6 3,600.4 7,488.3 6,825.3
United States | Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 848.0 746.6 1,480.8 1,349.3
United States | Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 933.1 926.2 1,608.0 1,584.5
United States | Other        
Disaggregation of Revenue [Line Items]        
Total Net sales 9.1 5.4 16.6 11.1
Rest of World        
Disaggregation of Revenue [Line Items]        
Total Net sales 839.4 698.0 1,658.3 1,405.5
Rest of World | Commercial        
Disaggregation of Revenue [Line Items]        
Total Net sales 22.8 30.9 46.5 61.3
Rest of World | Government        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.0 0.1 2.2
Rest of World | Education        
Disaggregation of Revenue [Line Items]        
Total Net sales 0.0 0.4 0.1 0.6
Rest of World | Other        
Disaggregation of Revenue [Line Items]        
Total Net sales $ 816.6 $ 666.7 $ 1,611.6 $ 1,341.4