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Long-Term Debt - Narrative (Details) £ in Millions, $ in Millions |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 13, 2020 USD ($) | Sep. 26, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 GBP (£) | Apr. 21, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  | $ 3,954.4 |  |  | $ 3,337.9
CDW UK revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
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 |  |  | 2,200.0 |  |  |
Additional borrowing capacity |  |  | 1,000.0 |  |  |
Long-term debt |  |  | 0.0 |  |  | $ 51.0
Senior secured asset-based revolving credit facility | CDW UK revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowing capacity of the Revolving Loan |  |  | 68.0 | £ 50 |  |
CDW UK term loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount of restricted payment capacity under the loan |  |  | 218.0 | £ 159 |  |
Long-term debt |  |  | $ 56.0 |  |  | $ 61.0
Interest rate in effect |  |  | 1.445% | 1.445% |  | 2.19%
Senior secured term loan facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount of restricted payment capacity under the loan |  |  | $ 2,200.0 |  |  |
Periodic payment, principal |  |  | 4.0 |  |  |
Long-term debt |  |  | $ 1,423.4 |  |  | $ 1,438.3
Interest rate in effect |  |  | 1.90% | 1.90% |  | 3.55%
Senior notes due 2028 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  | $ 600.0 |  |  | $ 600.0
Interest rate in effect |  |  | 4.25% | 4.25% |  | 4.25%
Senior Notes due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  | $ 525.0 |  |  |  |
Interest rate, stated percentage |  | 5.00% |  |  |  |
Percentage of principal amount redeemed |  | 102.50% |  |  |  |
Unsecured Debt | Senior Notes due 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, aggregate principal amount | $ 700.0 |  |  |  |  |
Interest rate, stated percentage | 3.25% |  |  |  |  |
Unsecured Debt | Senior notes due 2028 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, aggregate principal amount |  | $ 600.0 |  |  |  |
Interest rate, stated percentage |  | 4.25% |  |  |  |
Unsecured Debt | Senior Notes due May 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, aggregate principal amount |  |  |  |  | $ 600.0 |
Interest rate, stated percentage |  |  |  |  | 4.125% |
Senior Notes due September 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 600.0 |  | $ 0.0 |  |  | $ 600.0
Interest rate in effect |  |  | 0.00% | 0.00% |  | 5.00%
Interest rate, stated percentage | 5.00% |  |  |  |  |
Percentage of principal amount redeemed | 103.75% |  |  |  |  |
Accounts Payable, Inventory Financing | Senior secured asset-based revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount owed under Revolving loan financing agreement |  |  | $ 459.0 |  |  |

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