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Long-Term Debt - Term Loan (Details)
£ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Aug. 01, 2016
GBP (£)
Sep. 30, 2018
GBP (£)
Sep. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
GBP (£)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]                    
Debt, short-term and long-term                 $ 3,318.2 $ 3,267.8
Net loss on extinguishments of long-term debt       $ 0.0 $ 0.0 $ 57.4 $ 0.0      
Senior secured term loan facility                    
Debt Instrument [Line Items]                    
Debt, short-term and long-term                 1,475.6 $ 1,483.0
Deferred financing costs                 $ 2.0  
Quarterly amortization payment of original principal, Percent               0.25% 0.25%  
Net loss on extinguishments of long-term debt       $ 14.0            
Deferred finance costs, net and unamortized premium                 $ (5.0)  
Unamortized discount                 $ 9.0  
Interest Rate               3.20% 3.20% 3.30%
CDW UK term loan                    
Debt Instrument [Line Items]                    
Debt, short-term and long-term £ 56               $ 72.9 $ 69.1
Variable interest rate margin               1.40% 1.40%  
Deferred finance costs, net and unamortized premium                 $ (1.0)  
Debt instrument term 5 years                  
Interest Rate               1.69% 1.69% 1.80%
CDW UK Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Additional borrowing capacity               £ 50 $ 65.0  
ABR | Senior secured term loan facility                    
Debt Instrument [Line Items]                    
Variable interest rate margin               1.00% 1.00%  
LIBOR | Senior secured term loan facility                    
Debt Instrument [Line Items]                    
Variable interest rate margin               2.00% 2.00%  
Potential margin reduction               0.0025 0.0025  
Scenario, Forecast | CDW UK term loan                    
Debt Instrument [Line Items]                    
Repayments of debt   £ 5 $ 7.0