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Long-Term Debt - Debt Balances and Interest Rates (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Aug. 13, 2020
Dec. 31, 2019
Sep. 26, 2019
Debt Instrument [Line Items]        
Long-term debt $ 3,954.4   $ 3,337.9  
Deferred finance costs, net (27.2)   (20.6)  
Long-term debt, current maturities, gross (70.9)   (34.1)  
Long-term debt, excluding current maturities, net of deferred financing costs $ 3,856.3   $ 3,283.2  
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 0.00%   5.00%  
Long-term debt $ 0.0   $ 51.0  
Senior secured asset-based revolving credit facility        
Debt Instrument [Line Items]        
Long-term debt $ 0.0   $ 51.0  
CDW UK term loan        
Debt Instrument [Line Items]        
Interest rate in effect 1.445%   2.19%  
Long-term debt $ 56.0   $ 61.0  
Senior secured term loan facility        
Debt Instrument [Line Items]        
Interest rate in effect 1.90%   3.55%  
Long-term debt $ 1,423.4   $ 1,438.3  
Total term loans        
Debt Instrument [Line Items]        
Long-term debt $ 1,479.4   $ 1,499.3  
Senior Notes due 2023        
Debt Instrument [Line Items]        
Long-term debt       $ 525.0
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 May 2025        
Debt Instrument [Line Items]        
Interest rate in effect 4.125%   0.00%  
Long-term debt $ 600.0   $ 0.0  
Senior Notes due September 2025        
Debt Instrument [Line Items]        
Interest rate in effect 0.00%   5.00%  
Long-term debt $ 0.0 $ 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%   0.00%  
Long-term debt $ 700.0   $ 0.0  
Total unsecured senior notes        
Debt Instrument [Line Items]        
Long-term debt 2,475.0   1,775.0  
Other long-term obligations        
Debt Instrument [Line Items]        
Long-term debt $ 0.0   $ 12.6