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Long-Term Debt - Debt Balances and Interest Rates (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term debt $ 3,226.5 $ 3,255.9
Long-term debt, current maturities, gross 25.3 25.5
Deferred finance costs, net (17.9) (20.4)
Long-term debt, excluding current maturities, net of deferred financing costs $ 3,183.3 $ 3,210.0
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 0.00% 0.00%
Long-term debt $ 0.0 $ 0.0
CDW UK term loan    
Debt Instrument [Line Items]    
Interest rate in effect 2.30% 1.90%
Long-term debt $ 65.0 $ 75.7
Senior secured term loan facility    
Debt Instrument [Line Items]    
Interest rate in effect 4.10% 3.70%
Long-term debt $ 1,453.2 $ 1,468.0
Total term loans    
Debt Instrument [Line Items]    
Long-term debt $ 1,518.2 $ 1,543.7
Senior notes due 2023    
Debt Instrument [Line Items]    
Interest rate in effect 5.00% 5.00%
Long-term debt $ 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
Total unsecured senior notes    
Debt Instrument [Line Items]    
Long-term debt 1,700.0 1,700.0
Other long-term obligations    
Debt Instrument [Line Items]    
Long-term debt $ 8.3 $ 12.2