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v3.19.3.a.u2

Long-Term Debt - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 GBP (£) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Sep. 26, 2019 USD ($) | Dec. 31, 2018 USD ($) | Apr. 03, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 3,337.9 |  | $ 3,226.5 |
CDW UK revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowing capacity of the Revolving Loan | £ 50,000,000 |  |  | 66.0 |  |  |
Long-term debt |  |  |  | $ 0.0 |  | $ 0.0 |
Interest rate in effect | 0.00% |  |  | 0.00% |  | 0.00% |
Senior secured asset-based revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Undrawn letters of credit |  |  |  | $ 1.0 |  |  |
Borrowing base |  |  |  | 2,000.0 |  |  |
Additional borrowing capacity |  |  |  | 1,000.0 |  |  |
Long-term debt |  |  |  | 51.0 |  | $ 0.0 |
CDW UK term loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Annual principal repayment installments | £ 5,000,000 | $ 7.0 |  |  |  |  |
Amount of restricted payment capacity under the loan | £ 154,000,000 |  |  | 204.0 |  |  |
Long-term debt |  |  |  | $ 61.0 |  | $ 65.0 |
Interest rate in effect | 2.19% |  |  | 2.19% |  | 2.29% |
Senior secured term loan facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount of restricted payment capacity under the loan |  |  |  | $ 1,800.0 |  |  |
Periodic payment, principal |  |  | $ 4.0 |  |  |  |
Long-term debt |  |  |  | $ 1,438.3 |  | $ 1,453.2 |
Interest rate in effect | 3.55% |  |  | 3.55% |  | 4.10% |
Senior notes due 2028 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 600.0 | $ 0.0 |
Interest rate in effect |  |  |  |  | 4.25% | 0.00% |
Senior notes due 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 0.0 | $ 525.0 | $ 525.0 |
Interest rate in effect | 0.00% |  |  | 0.00% |  | 5.00% |
Redemption price, percentage |  |  | 102.50% |  |  |  |
LIBOR | CDW UK term loan |  |  |  |  |  |  |
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 |  |  |  | $ 359.0 |  |  |

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