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Debt - Debt Balances and Interest Rates (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Long-term debt $ 4,089.9 $ 3,954.4
Unamortized deferred financing fees (23.7) (27.2)
Current maturities of long-term debt (28.5) (70.9)
Total long-term debt 4,037.7 3,856.3
Senior secured asset-based revolving credit facility    
Debt Instrument [Line Items]    
Long-term debt 165.9 0.0
Total term loans    
Debt Instrument [Line Items]    
Long-term debt $ 1,412.2 $ 1,479.4
CDW UK term loan    
Debt Instrument [Line Items]    
Interest rate in effect 0.00% 1.445%
Long-term debt $ 0.0 $ 56.0
Senior secured term loan facility    
Debt Instrument [Line Items]    
Long-term debt 1,412.2 1,423.4
Total unsecured senior notes    
Debt Instrument [Line Items]    
Long-term debt $ 2,475.0 $ 2,475.0
Senior notes due 2024    
Debt Instrument [Line Items]    
Interest rate in effect 5.50% 5.50%
Long-term debt $ 575.0 $ 575.0
Senior notes due 2025    
Debt Instrument [Line Items]    
Interest rate in effect 4.125% 4.125%
Long-term debt $ 600.0 $ 600.0
Senior notes due 2028    
Debt Instrument [Line Items]    
Interest rate in effect 4.25% 4.25%
Long-term debt $ 600.0 $ 600.0
Senior Notes due 2029    
Debt Instrument [Line Items]    
Interest rate in effect 3.25% 3.25%
Long-term debt $ 700.0 $ 700.0
Other long-term obligations    
Debt Instrument [Line Items]    
Long-term debt $ 36.8 $ 0.0