Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc.	$ (28.6)	$ (47.0)	$ (2.3)
Weighted average number of shares outstanding-basic (in shares)	432,354,671	430,495,779	429,106,164
Weighted average number of shares outstanding-diluted (in shares)	432,354,671	430,495,779	429,106,164
Earnings (loss) per share of common stock:
Basic (USD per share)	$ (0.07)	$ (0.11)	$ (0.01)
Diluted (USD per share)	$ (0.07)	$ (0.11)	$ (0.01)
Antidilutive securities excluded from computation of EPS (in shares)	10,966,541	11,681,260	9,618,019