Acquisitions - Pro Forma Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Business Acquisition [Line Items]
Revenue	$ 537.3	$ 520.9	$ 1,073.3	$ 1,025.4
Total pro forma revenue		532.6		1,051.0
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.	(1.8)	(51.7)	(33.1)	(76.7)
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.	$ (1.8)	(51.7)	$ (33.1)	(76.7)
Pro forma net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		(53.9)		(77.2)
Bisnode
Business Acquisition [Line Items]
Revenue		0.0		4.6
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		0.0		0.8
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		0.0		0.8
Eyeota
Business Acquisition [Line Items]
Revenue		9.2		16.5
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		(0.5)		(1.2)
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		(0.5)		(1.2)
NetWise
Business Acquisition [Line Items]
Revenue		2.5		4.5
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		0.4		0.8
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		0.4		0.8
Intangible amortization - net of tax benefits
Business Acquisition [Line Items]
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		(2.1)		(3.5)
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		(2.1)		(3.5)
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.		0.0		2.3
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		0.0		2.3
Transaction costs - net of tax benefits
Business Acquisition [Line Items]
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		0.0		0.3
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		$ 0.0		$ 0.3