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Long-Term Debt - Debt Balances and Interest Rates (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt $ 3,491.9 $ 3,337.9
Unamortized deferred financing fees (19.7) (20.6)
Current maturities of long-term debt (33.7) (34.1)
Total long-term debt 3,438.5 3,283.2
Total credit facilities    
Debt Instrument [Line Items]    
Long-term debt $ 212.5 $ 51.0
CDW UK revolving credit facility    
Debt Instrument [Line Items]    
Interest rate in effect 0.00% 0.00%
Long-term debt $ 0.0 $ 0.0
Senior secured asset-based revolving credit facility    
Debt Instrument [Line Items]    
Interest rate in effect 2.62% 5.00%
Long-term debt $ 212.5 $ 51.0
Total term loans    
Debt Instrument [Line Items]    
Long-term debt $ 1,491.6 $ 1,499.3
CDW UK term loan    
Debt Instrument [Line Items]    
Interest rate in effect 2.07% 2.19%
Long-term debt $ 57.1 $ 61.0
Senior secured term loan facility    
Debt Instrument [Line Items]    
Interest rate in effect 2.74% 3.55%
Long-term debt $ 1,434.5 $ 1,438.3
Total unsecured senior notes    
Debt Instrument [Line Items]    
Long-term debt $ 1,775.0 $ 1,775.0
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 5.00% 5.00%
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
Other long-term obligations    
Debt Instrument [Line Items]    
Long-term debt $ 12.8 $ 12.6