Earnings (Loss) Per Share - Summary of Basic and Diluted Computation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., basic	$ (33.7)	$ (31.3)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., diluted	$ (33.7)	$ (31.3)
Weighted average number of shares outstanding-basic (shares)	429,584,681	428,779,816
Weighted average number of shares outstanding-diluted (shares)	429,584,681	428,779,816
Earnings (loss) per share of common stock:
Basic (USD per share)	$ (0.08)	$ (0.07)
Diluted (USD per share)	$ (0.08)	$ (0.07)
Antidilutive securities excluded from computation of EPS (shares)	11,700,000	7,700,000