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Long-Term Debt - Revolving Loan (Details) £ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 GBP (£) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Carrying value |  |  |  |  |  | $ 3,238,200,000 | $ 3,255,900,000
Net loss on extinguishments of long-term debt | $ 0 | $ 0 | $ 0 | $ 57,400,000 |  |  |
CDW UK term loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Carrying value |  |  |  |  | £ 51 | $ 66,000,000 | 75,700,000
Variable interest rate margin |  |  |  |  | 1.40% | 1.40% |
Deferred finance costs, net and unamortized premium |  |  |  |  | £ 1 | $ 1,000,000 |
Senior secured asset-based revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Carrying value |  |  |  |  |  | 0 | $ 0
Undrawn letters of credit |  |  |  |  |  | 1,000,000 |
Borrowing base |  |  |  |  |  | 2,000,000,000.0 |
Additional borrowing capacity |  |  |  |  |  | 1,100,000,000 |
Cash availability, minimum liquidity |  |  |  |  |  | $ 125,000,000 |
Cash availability, percentage of borrowing base |  |  |  |  | 10.00% | 10.00% |
Minimum liquidity, amount |  |  |  |  |  | $ 100,000,000 |
Net loss on extinguishments of long-term debt |  |  |  | 1,000,000 |  |  |
Deferred finance costs, net and unamortized premium |  | $ 4,000,000 |  | $ 4,000,000 |  |  |
Debt term |  |  |  | 5 years |  |  |
Minimum | Senior secured asset-based revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Consolidated fixed charge coverage ratio |  |  |  |  | 1.00 | 1.00 |
Federal Funds Effective Swap Rate | Senior secured asset-based revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as percent) |  |  | 0.50% |  |  |  |
London Interbank Offered Rate (LIBOR) | Senior secured asset-based revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as percent) |  |  | 1.00% |  |  |  |
Accounts Payable, Inventory Financing | Senior secured asset-based revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount owed under Revolving loan financing agreement |  |  |  |  |  | $ 379,000,000 |
LIBOR | London Interbank Offered Rate (LIBOR) | Minimum | Senior secured asset-based revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable interest rate margin |  |  |  |  | 1.25% | 1.25% |
LIBOR | London Interbank Offered Rate (LIBOR) | Maximum | Senior secured asset-based revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable interest rate margin |  |  |  |  | 1.75% | 1.75% |
ABR | Base Rate | Minimum | Senior secured asset-based revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable interest rate margin |  |  |  |  | 0.25% | 0.25% |
ABR | Base Rate | Maximum | Senior secured asset-based revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable interest rate margin |  |  |  |  | 0.75% | 0.75% |

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