Earnings (Loss) Per Share - Summary of Basic and Diluted Computation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., basic	$ (1.8)	$ (51.7)	$ (33.1)	$ (76.7)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., diluted	$ (1.8)	$ (51.7)	$ (33.1)	$ (76.7)
Weighted average number of shares outstanding-basic (shares)	429,137,384	428,884,721	428,959,588	428,695,323
Weighted average number of shares outstanding-diluted (shares)	429,137,384	428,884,721	428,959,588	428,695,323
Earnings (loss) per share of common stock:
Basic (USD per share)	$ 0	$ (0.12)	$ (0.08)	$ (0.18)
Diluted (USD per share)	$ 0	$ (0.12)	$ (0.08)	$ (0.18)