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Income Taxes - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred tax liability on unremitted CDW UK earnings | $ 6.0 |  |  |
Unrecognized tax benefits | 19.3 | $ 18.7 | $ 18.4 | $ 18.3
State and Local Jurisdiction |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 5.0 |  |  |
State tax credit carryforwards | 16.0 |  |  |
Unrecognized tax benefits, impact on effective tax rate, net of tax rate | $ 16.0 |  |  |

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