Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Earnings Per Share [Abstract]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc.	$ (33.7)	$ (16.4)	$ (49.5)	$ (39.6)
Weighted average number of shares outstanding-basic (in shares)	435,358,541	432,749,213	434,342,255	432,152,568
Weighted average number of shares outstanding-diluted (in shares)	435,358,541	432,749,213	434,342,255	432,152,568
Earnings (loss) per share of common stock attributable to Dun & Bradstreet Holdings, Inc.:
Basic (in USD per share)	$ (0.08)	$ (0.04)	$ (0.11)	$ (0.09)
Diluted (in USD per share)	$ (0.08)	$ (0.04)	$ (0.11)	$ (0.09)
Antidilutive securities excluded from computation of EPS (in shares)	11,100,000	11,100,000	10,900,000	11,000,000