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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 |

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