Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc.	$ (16.4)	$ (19.4)	$ (39.6)	$ (53.1)
Weighted average number of shares outstanding-basic (in shares)	432,749,213	430,471,647	432,152,568	430,030,614
Weighted average number of shares outstanding-diluted (in shares)	432,749,213	430,471,647	432,152,568	430,030,614
Earnings (loss) per share of common stock attributable to Dun & Bradstreet Holdings, Inc.:
Basic (in USD per share)	$ (0.04)	$ (0.04)	$ (0.09)	$ (0.12)
Diluted (in USD per share)	$ (0.04)	$ (0.04)	$ (0.09)	$ (0.12)
Antidilutive securities excluded from computation of EPS (in shares)	11,100,000	11,700,000	11,000,000.0	11,800,000