Earnings (Loss) Per Share - Summary of Basic and Diluted Computation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., basic	$ (31.3)	$ (25.0)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., diluted	$ (31.3)	$ (25.0)
Weighted average number of shares outstanding-basic (shares)	428,779,816	428,503,820
Weighted average number of shares outstanding-diluted (shares)	428,779,816	428,503,820
Earnings (loss) per share of common stock:
Basic (USD per share)	$ (0.07)	$ (0.06)
Diluted (USD per share)	$ (0.07)	$ (0.06)