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Long-Term Debt - Debt Balances and Interest Rates (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Sep. 26, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Long-term debt $ 3,337.9   $ 3,226.5
Deferred finance costs, net (20.6)   (17.9)
Long-term debt, current maturities, gross (34.1)   (25.3)
Long-term debt, excluding current maturities, net of deferred financing costs $ 3,283.2   $ 3,183.3
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 5.00%   0.00%
Long-term debt $ 51.0   $ 0.0
Senior secured asset-based revolving credit facility      
Debt Instrument [Line Items]      
Long-term debt $ 51.0   $ 0.0
CDW UK term loan      
Debt Instrument [Line Items]      
Interest rate in effect 2.19%   2.29%
Long-term debt $ 61.0   $ 65.0
Senior secured term loan facility      
Debt Instrument [Line Items]      
Interest rate in effect 3.55%   4.10%
Long-term debt $ 1,438.3   $ 1,453.2
Total term loans      
Debt Instrument [Line Items]      
Long-term debt $ 1,499.3   $ 1,518.2
Senior notes due 2023      
Debt Instrument [Line Items]      
Interest rate in effect 0.00%   5.00%
Long-term debt $ 0.0 $ 525.0 $ 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 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% 0.00%
Long-term debt   $ 600.0 $ 0.0
Total unsecured senior notes      
Debt Instrument [Line Items]      
Long-term debt 1,775.0   1,700.0
Other long-term obligations      
Debt Instrument [Line Items]      
Long-term debt $ 12.6   $ 8.3