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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
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