Cover Page - shares	12 Months Ended
	Dec. 31, 2020	Feb. 19, 2021
Cover [Abstract]
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0001799208
Current Fiscal Year End Date	--12-31
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Document Transition Report	false
Entity File Number	1-39361
Entity Registrant Name	Dun & Bradstreet Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	83-2008699
Entity Address, Address Line One	101 JFK Parkway
Entity Address, City or Town	Short Hills
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07078
City Area Code	973
Local Phone Number	921-5500
Title of 12(b) Security	Common Stock, $0.0001 par value
Trading Symbol	DNB
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		429,439,194