Basis of Presentation (Policies)	9 Months Ended
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying interim unaudited condensed consolidated financial statements of Dun & Bradstreet Holdings, Inc. (formerly Star Intermediate I, Inc.) and its subsidiaries (‘‘we’’ ‘‘us’’ ‘‘our’’ or the ‘‘Company’’) were prepared in accordance with generally accepted accounting principles in the United States of America (‘‘GAAP’’). They should be read in conjunction with the consolidated financial statements and related notes, which appear in the consolidated financial statements for the year ended December 31, 2019, included in our final prospectus dated June 30, 2020 and filed with the Securities and Exchange Commission on July 2, 2020. The unaudited condensed consolidated financial statements for interim periods do not include all disclosures required by GAAP for annual financial statements and are not necessarily indicative of results for the full year or any subsequent period. In the opinion of our management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair statement of the unaudited consolidated financial position, results of operations and cash flows at the dates and for the periods presented have been included.
Basis of Consolidation	All intercompany transactions and balances have been eliminated in consolidation.
Segment Reporting	Since the Take-Private Transaction, management has made changes to transform our business. As a result, during the fourth quarter of 2019, we changed the composition of our reportable segments, the classification of revenue by solution set and our measure of segment profit (from operating income to adjusted EBITDA (see Note 18 for further discussion of adjusted EBITDA) in the information that we provide to our chief operating decision makers ("CODMs") to better align with how they assess performance and allocate resources. Latin America Worldwide Network, which was previously included in the Americas reportable segment, is currently included in the International segment. Accordingly, prior period results have been recast to conform to the current presentation of segments, revenue by solution, and the measure of segment profit. These changes do not impact our consolidated results. We manage our business and report our financial results through the following two segments: •North America offers Finance & Risk and Sales & Marketing data, analytics and business insights in the United States and Canada; and •International offers Finance & Risk and Sales & Marketing data, analytics and business insights directly in the United Kingdom/Ireland ("U.K."), Greater China, India and indirectly through our WWN alliances. Except as described below, the unaudited condensed consolidated financial statements reflect results of the subsidiaries outside of North America for the three and nine months ended August 31 in order to facilitate the timely reporting of the unaudited condensed consolidated financial results and unaudited condensed consolidated financial position. For the period from January 1, 2019 to September 30, 2019 (Successor), the results of subsidiaries outside of North America are reflected for the period from February 8, 2019 through August 31, 2019. For the period from January 1 to February 7, 2019 (Predecessor), the results of subsidiaries outside of North America are reflected for the period from December 1, 2018 to January 7, 2019.
Use of Estimates	Our unaudited condensed consolidated financial statements presented herein reflect the latest estimates and assumptions made by management that affect the reported amounts of assets and liabilities and related disclosures as of the date of the unaudited consolidated financial statements and reported amounts of revenue and expenses during the reporting periods presented. Since early 2020, the novel coronavirus ("COVID-19") global pandemic has caused disruptions in the economy and volatility in the global financial markets. There is considerable uncertainty regarding its duration and the speed and nature of recovery. The extent of the impact of the COVID-19 global pandemic on our operations and financial performance will depend on the effects on our clients and vendors, which are uncertain at this time and cannot be predicted. In addition, the pandemic may affect management's estimates and assumptions of variable consideration in contracts with clients as well as other estimates and assumptions, in particular those that require a projection of our financial results, our cash flows or broader economic conditions.
Recently Adopted Accounting Pronouncements & Recently Issued Accounting Pronouncements	Recently Adopted Accounting Pronouncements In August 2018, the FASB issued ASU No. 2018-15, “Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract: Disclosures for Implementation Costs Incurred for Internal-Use Software and Cloud Computing Arrangements - a consensus of the EITF.” The standard aligns the accounting for costs incurred to implement a cloud computing arrangement that is a service arrangement with the guidance on capitalizing costs associated with developing or obtaining internal-use software. Costs incurred during the planning and post implementation stages are typically expensed, while costs incurred during the development stage are typically capitalized. The capitalized implementation costs are to be expensed over the term of the hosting arrangement including renewal options to the extent those options are expected to be utilized. This update also requires the capitalized implementation costs to be presented in the consolidated financial statements consistent with the presentation of the ongoing fees and payments associated with the cloud arrangement. We adopted this update as of January 1, 2020 and applied its amendments prospectively to implementation costs incurred after the date of adoption. This update did not have a material effect on our unaudited condensed consolidated financial statements and related disclosures. In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” The standard changes the impairment model for most financial assets and certain other instruments. For trade and other receivables, held-to-maturity debt securities, loans and other instruments, entities are required to use a new forward-looking “expected loss” model that generally will result in the earlier recognition of allowances for losses. For available-for-sale debt securities with unrealized losses, entities measure credit losses in a manner similar to what is required under the existing guidance, except that the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. We adopted this update as of January 1, 2020. This update did not have a material effect on our unaudited condensed consolidated financial statements and related disclosures. Recently Issued Accounting Pronouncements In December 2019, the FASB issued ASU No. 2019-12, "Income Taxes (Topic 740)." The amendments in this Update simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The amendments also improve consistent application of and simplify GAAP for other areas of Topic 740 by clarifying and amending existing guidance. For public business entities, the amendments in this Update are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. For all other entities, the amendments in this Update are effective for fiscal years beginning after December 15, 2021 and interim periods within fiscal years beginning after December 15, 2022. We do not expect the adoption of this authoritative guidance to have a material impact on our consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-14, “Compensation-Retirement Benefits-Defined Benefit Plans- General (Topic 715-20): Changes to the Disclosure Requirements for Defined Benefit Plans.” The standard amends ASC 715, “Compensation - Retirement Benefits,” to add, remove, and clarify disclosure requirements related to defined benefit pension and other postretirement plans. The amendments are to be applied retrospectively. The standard is effective for public business entities for fiscal years ending after December 15, 2020, and for all other entities for fiscal years ending after December 15, 2021. Early adoption is permitted. The adoption of this authoritative guidance will not have a material impact on our consolidated financial statements.

Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying interim unaudited condensed consolidated financial statements of Dun & Bradstreet Holdings, Inc. (formerly Star Intermediate I, Inc.) and its subsidiaries (‘‘we’’ ‘‘us’’ ‘‘our’’ or the ‘‘Company’’) were prepared in accordance with generally accepted accounting principles in the United States of America (‘‘GAAP’’). They should be read in conjunction with the consolidated financial statements and related notes, which appear in the consolidated financial statements for the year ended December 31, 2019, included in our final prospectus dated June 30, 2020 and filed with the Securities and Exchange Commission on July 2, 2020. The unaudited condensed consolidated financial statements for interim periods do not include all disclosures required by GAAP for annual financial statements and are not necessarily indicative of results for the full year or any subsequent period. In the opinion of our management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair statement of the unaudited consolidated financial position, results of operations and cash flows at the dates and for the periods presented have been included.

Basis of Consolidation

All intercompany transactions and balances have been eliminated in consolidation.

Segment Reporting

Since the Take-Private Transaction, management has made changes to transform our business. As a result, during the fourth quarter of 2019, we changed the composition of our reportable segments, the classification of revenue by solution set and our measure of segment profit (from operating income to adjusted EBITDA (see Note 18 for further discussion of adjusted EBITDA) in the information that we provide to our chief operating decision makers ("CODMs") to better align with how they assess performance and allocate resources. Latin America Worldwide Network, which was previously included in the Americas reportable segment, is currently included in the International segment. Accordingly, prior period results have been recast to conform to the current presentation of segments, revenue by solution, and the measure of segment profit. These changes do not impact our consolidated results.

We manage our business and report our financial results through the following two segments:

•North America offers Finance & Risk and Sales & Marketing data, analytics and business insights in the United States and Canada; and

•International offers Finance & Risk and Sales & Marketing data, analytics and business insights directly in the United Kingdom/Ireland ("U.K."), Greater China, India and indirectly through our WWN alliances.

Except as described below, the unaudited condensed consolidated financial statements reflect results of the subsidiaries outside of North America for the three and nine months ended August 31 in order to facilitate the timely reporting of the unaudited condensed consolidated financial results and unaudited condensed consolidated financial position. For the period from January 1, 2019 to September 30, 2019 (Successor), the results of subsidiaries outside of North America are reflected for the period from February 8, 2019 through August 31, 2019. For the period from January 1 to February 7, 2019 (Predecessor), the results of subsidiaries outside of North America are reflected for the period from December 1, 2018 to January 7, 2019.

Use of Estimates

Our unaudited condensed consolidated financial statements presented herein reflect the latest estimates and assumptions made by management that affect the reported amounts of assets and liabilities and related disclosures as of the date of the unaudited consolidated financial statements and reported amounts of revenue and expenses during the reporting periods presented. Since early 2020, the novel coronavirus ("COVID-19") global pandemic has caused disruptions in the economy and volatility in the global financial markets. There is considerable uncertainty regarding its duration and the speed and nature of recovery. The extent of the impact of the COVID-19 global pandemic on our operations and financial performance will depend on the effects on our clients and vendors, which are uncertain at this time and cannot be predicted. In addition, the pandemic may affect management's estimates and assumptions of variable consideration in contracts with clients as well as other estimates and assumptions, in particular those that require a projection of our financial results, our cash flows or broader economic conditions.

Recently Adopted Accounting Pronouncements & Recently Issued Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In August 2018, the FASB issued ASU No. 2018-15, “Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract: Disclosures for Implementation Costs Incurred for Internal-Use Software and Cloud Computing Arrangements - a consensus of the EITF.” The standard aligns the accounting for costs incurred to implement a cloud computing arrangement that is a service arrangement with the guidance on capitalizing costs associated with developing or obtaining internal-use software. Costs incurred during the planning and post implementation stages are typically expensed, while costs incurred during the development stage are typically capitalized. The capitalized implementation costs are to be expensed over the term of the hosting arrangement including renewal options to the extent those options are expected to be utilized. This update also requires the capitalized implementation costs to be presented in the consolidated financial statements consistent with the presentation of the ongoing fees and payments associated with the cloud arrangement. We adopted this update as of January 1, 2020 and applied its amendments prospectively to implementation costs incurred after the date of adoption. This update did not have a material effect on our unaudited condensed consolidated financial statements and related disclosures.

In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” The standard changes the impairment model for most financial assets and certain other instruments. For trade and other receivables, held-to-maturity debt securities, loans and other instruments, entities are required to use a new forward-looking “expected loss” model that generally will result in the earlier recognition of allowances for losses. For available-for-sale debt securities with unrealized losses, entities measure credit losses in a manner similar to what is required under the existing guidance, except that the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. We adopted this update as of January 1, 2020. This update did not have a material effect on our unaudited condensed consolidated financial statements and related disclosures.

Recently Issued Accounting Pronouncements

In December 2019, the FASB issued ASU No. 2019-12, "Income Taxes (Topic 740)." The amendments in this Update simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The amendments also improve consistent application of and simplify GAAP for other areas of Topic 740 by clarifying and amending existing guidance. For public business entities, the amendments in this Update are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. For all other entities, the amendments in this Update are effective for fiscal years beginning after December 15, 2021 and interim periods within fiscal years beginning after December 15, 2022. We do not expect the adoption of this authoritative guidance to have a material impact on our consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-14, “Compensation-Retirement Benefits-Defined Benefit Plans-

General (Topic 715-20): Changes to the Disclosure Requirements for Defined Benefit Plans.” The standard amends ASC 715, “Compensation - Retirement Benefits,” to add, remove, and clarify disclosure requirements related to defined benefit pension and other postretirement plans. The amendments are to be applied retrospectively. The standard is effective for public business entities for fiscal years ending after December 15, 2020, and for all other entities for fiscal years ending after December 15, 2021. Early adoption is permitted. The adoption of this authoritative guidance will not have a material impact on our consolidated financial statements.