Earnings (Loss) Per Share - Basic and Diluted Computation (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., basic	$ (47.0)	$ (2.3)	$ (71.7)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., diluted	$ (47.0)	$ (2.3)	$ (71.7)
Weighted average number of shares outstanding - basic (in shares)	430,495,779	429,106,164	428,666,791
Weighted average number of shares outstanding - diluted (in shares)	430,495,779	429,106,164	428,666,791
Earnings (loss) per share of common stock:
Basic (USD per share)	$ (0.11)	$ (0.01)	$ (0.17)
Diluted (USD per share)	$ (0.11)	$ (0.01)	$ (0.17)
Antidilutive securities excluded from computation of EPS (in shares)	11,681,260	9,618,019	1,092,148