Earnings (Loss) Per Share - Summary (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., basic	$ (2.3)	$ (71.7)	$ (180.6)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., diluted	$ (2.3)	$ (71.7)	$ (180.6)
Weighted average number of shares outstanding - basic (shares)	429,106,164	428,666,791	367,132,099
Weighted average number of shares outstanding - diluted (shares)	429,106,164	428,666,791	367,132,099
Earnings (loss) per share of common stock:
Basic (USD per share)	$ (0.01)	$ (0.17)	$ (0.49)
Diluted (USD per share)	$ (0.01)	$ (0.17)	$ (0.49)