Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc.	$ 3.2	$ 4.4	$ (36.4)	$ (48.7)
Weighted average number of shares outstanding-basic (in shares)	432,411,418	430,816,432	432,239,481	430,295,432
Weighted average number of shares outstanding-diluted (in shares)	435,614,879	432,224,821	432,239,481	430,295,432
Earnings (loss) per share of common stock attributable to Dun & Bradstreet Holdings, Inc.:
Basic (in USD per share)	$ 0.01	$ 0.01	$ (0.08)	$ (0.11)
Diluted (in USD per share)	$ 0.01	$ 0.01	$ (0.08)	$ (0.11)
Antidilutive securities excluded from computation of EPS (in shares)	10,900,000	11,700,000	11,000,000.0	11,900,000