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Related Party Transactions (Details) | 1 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 shareholder
Controlling Shareholders | Dropbox Charitable Foundation |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of controlling shareholders in related party transaction | shareholder |  |  |  |  | 2
Payments to related party |  |  | $ 0 | $ 1,900,000 |
General and administrative expense from donated shares |  |  |  | 9,400,000 |
Affiliated Entity | Infrastructure Equipment Under Capital Leases and Commercial Products and Services |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Payments to related party | $ 5,500,000 | $ 18,400,000 |  | $ 87,100,000 |

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