Acquisitions - Pro Forma Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Business Acquisition [Line Items]
Revenue	$ 536.0	$ 504.5
Total pro forma revenue		518.4
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.	(31.3)	(25.0)
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.	$ (31.3)	(25.0)
Pro forma net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		(23.3)
Pre-acquisition net income:
Business Acquisition [Line Items]
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.
Intangible amortization - net of tax benefits
Business Acquisition [Line Items]
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		(1.4)
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		(1.4)
Write off related to pre-existing relationship - net of tax benefits
Business Acquisition [Line Items]
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		2.3
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		2.3
Transaction costs - net of tax benefits
Business Acquisition [Line Items]
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		0.3
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		0.3
Bisnode
Business Acquisition [Line Items]
Revenue		4.6
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		0.8
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		0.8
Eyeota
Business Acquisition [Line Items]
Revenue		7.3
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		(0.7)
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		(0.7)
NetWise
Business Acquisition [Line Items]
Revenue		2.0
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		0.4
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		$ 0.4