Earnings (Loss) Per Share - Basic and Diluted Computation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., basic	$ (19.4)	$ (1.8)	$ (53.1)	$ (33.1)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., diluted	$ (19.4)	$ (1.8)	$ (53.1)	$ (33.1)
Weighted average number of shares outstanding-basic (in shares)	430,471,647	429,137,384	430,030,614	428,959,588
Weighted average number of shares outstanding-diluted (in shares)	430,471,647	429,137,384	430,030,614	428,959,588
Earnings (loss) per share of common stock attributable to Dun & Bradstreet Holdings, Inc.:
Basic (in USD per share)	$ (0.04)	$ 0	$ (0.12)	$ (0.08)
Diluted (in USD per share)	$ (0.04)	$ 0	$ (0.12)	$ (0.08)
Antidilutive securities excluded from computation of EPS (in shares)	11,700,000	7,800,000	11,800,000	7,800,000