XML 57 R45.htm IDEA: XBRL DOCUMENT
v3.20.2

Fair Value Measurements (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | $ 334.1 | $ 551.3
Total short-term investments | 783.5 | 607.7
Supranational securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments |  | 4.0
Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 361.4 | 286.6
US Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 235.8 | 171.3
Asset-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 83.6 | 53.8
Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 40.0 | 24.2
US Agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 27.9 | 27.2
Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 26.0 | 38.2
Municipal securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 6.0 | 2.4
Foreign government obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 2.8 |
Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 1.1 |
Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 241.5 | 444.3
Municipal securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 1.8 |
Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 1.2 | 2.0
Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity investments | 5.6 |
Fair Value, Measurements, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 783.5 | 607.7
Total cash equivalents and short-term investments | 1,029.1 |
Equity investments |  | 9.8
Total |  | 1,063.8
Fair Value, Measurements, Recurring | Supranational securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments |  | 4.0
Fair Value, Measurements, Recurring | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 361.4 | 286.6
Fair Value, Measurements, Recurring | US Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 235.8 | 171.3
Fair Value, Measurements, Recurring | Asset-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 83.6 | 53.8
Fair Value, Measurements, Recurring | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 40.0 | 24.2
Fair Value, Measurements, Recurring | US Agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 27.9 | 27.2
Fair Value, Measurements, Recurring | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 26.0 | 38.2
Fair Value, Measurements, Recurring | Municipal securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 6.0 | 2.4
Fair Value, Measurements, Recurring | Foreign government obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 2.8 |
Fair Value, Measurements, Recurring | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 1.1 |
Fair Value, Measurements, Recurring | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 241.5 | 444.3
Fair Value, Measurements, Recurring | Municipal securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 1.8 |
Fair Value, Measurements, Recurring | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 1.2 | 2.0
Fair Value, Measurements, Recurring | Cash equivalents |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 245.6 | 446.3
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Total cash equivalents and short-term investments | 241.5 |
Equity investments |  | 9.8
Total |  | 454.1
Fair Value, Measurements, Recurring | Level 1 | Supranational securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments |  | 0.0
Fair Value, Measurements, Recurring | Level 1 | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | US Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | US Agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Municipal securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Foreign government obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 |
Fair Value, Measurements, Recurring | Level 1 | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 0.0 |
Fair Value, Measurements, Recurring | Level 1 | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 241.5 | 444.3
Fair Value, Measurements, Recurring | Level 1 | Municipal securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 0.0 |
Fair Value, Measurements, Recurring | Level 1 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Cash equivalents |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 241.5 | 444.3
Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 783.5 | 607.7
Total cash equivalents and short-term investments | 787.6 |
Equity investments |  | 0.0
Total |  | 609.7
Fair Value, Measurements, Recurring | Level 2 | Supranational securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments |  | 4.0
Fair Value, Measurements, Recurring | Level 2 | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 361.4 | 286.6
Fair Value, Measurements, Recurring | Level 2 | US Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 235.8 | 171.3
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 83.6 | 53.8
Fair Value, Measurements, Recurring | Level 2 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 40.0 | 24.2
Fair Value, Measurements, Recurring | Level 2 | US Agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 27.9 | 27.2
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 26.0 | 38.2
Fair Value, Measurements, Recurring | Level 2 | Municipal securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 6.0 | 2.4
Fair Value, Measurements, Recurring | Level 2 | Foreign government obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 2.8 |
Fair Value, Measurements, Recurring | Level 2 | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 1.1 |
Fair Value, Measurements, Recurring | Level 2 | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 2 | Municipal securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 1.8 |
Fair Value, Measurements, Recurring | Level 2 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 1.2 | 2.0
Fair Value, Measurements, Recurring | Level 2 | Cash equivalents |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 4.1 | 2.0
Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Total cash equivalents and short-term investments | 0.0 |
Equity investments |  | 0.0
Total |  | 0.0
Fair Value, Measurements, Recurring | Level 3 | Supranational securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments |  | 0.0
Fair Value, Measurements, Recurring | Level 3 | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | US Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | US Agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Municipal securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Foreign government obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total short-term investments | 0.0 |
Fair Value, Measurements, Recurring | Level 3 | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 0.0 |
Fair Value, Measurements, Recurring | Level 3 | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Municipal securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 0.0 |
Fair Value, Measurements, Recurring | Level 3 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Cash equivalents |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash equivalents | $ 0.0 | $ 0.0

X
- Definition Cash Equivalents, and Short-term Investments + References No definition available. + Details
Name: | dbx_CashEquivalentsAndShorttermInvestments
Namespace Prefix: | dbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
Name: | us-gaap_EquitySecuritiesFvNi
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=dbx_SupranationalSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CertificatesOfDepositMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ForeignGovernmentShorttermDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_CommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_CashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |