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Long-Term Debt - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
GBP (£)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Feb. 28, 2017
Debt Instrument [Line Items]              
Net loss on extinguishments of long-term debt     $ 0.0 $ 57.4 $ 2.1    
Long-term debt       3,255.9   $ 3,226.5  
Senior secured term loan facility              
Debt Instrument [Line Items]              
Amount of restricted payment capacity under the loan           1,500.0  
Periodic payment, principal     $ 4.0        
Net loss on extinguishments of long-term debt       14.0      
Amended prior senior secured term loan facility       1,500.0      
Long-term debt       1,468.0   1,453.2  
Write off of deferred financing fees       5.0      
Write off of deferred debt discount       9.0      
Payments of debt issuance costs       2.0      
CDW UK term loan              
Debt Instrument [Line Items]              
Annual principal repayment installments £ 5,000,000 $ 6.0          
Amount of restricted payment capacity under the loan 128,000,000         163.0  
Long-term debt       75.7   65.0  
CDW UK revolving credit facility              
Debt Instrument [Line Items]              
Borrowing capacity of the Revolving Loan £ 50,000,000         64.0  
Long-term debt       0.0   0.0  
Senior secured asset-based revolving credit facility              
Debt Instrument [Line Items]              
Undrawn letters of credit           1.0  
Borrowing base           1,800.0  
Additional borrowing capacity           1,100.0  
Net loss on extinguishments of long-term debt       1.0      
Capitalized fees as deferred financing costs       4.0      
Long-term debt       0.0   0.0  
Senior notes due 2025              
Debt Instrument [Line Items]              
Net loss on extinguishments of long-term debt       43.0      
Long-term debt       600.0   600.0  
Write off of deferred financing fees       6.0      
Redemption premium       37.0      
Total term loans              
Debt Instrument [Line Items]              
Long-term debt       $ 1,543.7   1,518.2  
LIBOR | Total term loans              
Debt Instrument [Line Items]              
Margin on borrowings, reduced interest rate from refinancing in bps             0.25%
Accounts Payable, Inventory Financing | Senior secured asset-based revolving credit facility              
Debt Instrument [Line Items]              
Amount owed under Revolving loan financing agreement           $ 393.0