Earnings (Loss) Per Share - Basic and Diluted Computation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., basic	$ 4.4	$ 8.0	$ (48.7)	$ (25.1)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., diluted	$ 4.4	$ 8.0	$ (48.7)	$ (25.1)
Weighted average number of shares outstanding-basic (in shares)	430,816,432	429,209,862	430,295,432	429,043,929
Weighted average number of shares outstanding-diluted (in shares)	432,224,821	429,426,048	430,295,432	429,043,929
Earnings (loss) per share of common stock attributable to Dun & Bradstreet Holdings, Inc.:
Basic (in USD per share)	$ 0.01	$ 0.02	$ (0.11)	$ (0.06)
Diluted (in USD per share)	$ 0.01	$ 0.02	$ (0.11)	$ (0.06)
Antidilutive securities excluded from computation of EPS (in shares)	11,700,000	7,600,000	11,900,000	7,700,000