Acquisitions - Pro Forma Information (Details) - USD ($) $ in Millions		1 Months Ended		3 Months Ended								12 Months Ended
		Feb. 07, 2019		Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Business Acquisition [Line Items]
Revenue		$ 178.7	[1]	$ 598.3	$ 541.9	$ 520.9	$ 504.5	$ 479.9	$ 444.4	$ 418.7	$ 395.7	$ 2,165.6	$ 1,738.7	[1]	$ 1,439.0	[1]	$ 1,716.4
Total pro forma revenue												2,210.1	2,113.0
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), basic		(75.6)		$ (11.6)	$ 16.6	$ (51.7)	$ (25.0)	$ 1.8	$ (16.3)	$ (208.0)	$ 41.9	(71.7)	(180.6)	[1]	(674.1)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), diluted												(71.7)	(180.6)	[1]	(674.1)
Bisnode
Business Acquisition [Line Items]
Revenue												4.6	400.0
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), basic	[1]	(75.6)													(674.1)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), diluted		(75.6)													(674.1)	[1]
Pro forma net income (loss) attributable to Dun & Bradstreet Holdings, Inc.												(68.2)	(178.1)
Bisnode | Adjustments to Bisnode's pre-acquisition revenue related to revenue received from Dun & Bradstreet Holdings, Inc.
Business Acquisition [Line Items]
Revenue												0.0	(21.0)
Bisnode | Adjustments to Dun & Bradstreet revenue related to revenue received from Bisnode
Business Acquisition [Line Items]
Revenue												0.0	(43.0)
Bisnode | Pre-acquisition net income (loss)
Business Acquisition [Line Items]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), basic												0.8	57.2
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), diluted												0.8	57.2
Bisnode | Intangible amortization - net of tax benefits
Business Acquisition [Line Items]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), basic												(1.1)	(56.8)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), diluted												(1.1)	(56.8)
Bisnode | Write off related to pre-existing relationship - net of tax benefits
Business Acquisition [Line Items]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), basic												2.3	(2.3)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), diluted												2.3	(2.3)
Bisnode | Transaction costs - net of tax benefits
Business Acquisition [Line Items]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), basic												3.0	3.5
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), diluted												3.0	3.5
Eyeota
Business Acquisition [Line Items]
Revenue												31.5	31.5
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), basic												(0.3)	(0.3)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), diluted												(0.3)	(0.3)
NetWise
Business Acquisition [Line Items]
Revenue												8.4	6.8
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), basic												(1.2)	1.2
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), diluted												$ (1.2)	$ 1.2
Lattice
Business Acquisition [Line Items]
Revenue		2.9													11.1		25.1
Total pro forma revenue		181.6													1,452.5		1,736.7
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), basic		(75.6)													(674.1)		288.1
Pro forma net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		(77.0)													(693.0)		267.4
Lattice | Pre-acquisition net income (loss)
Business Acquisition [Line Items]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), basic		(1.0)													(19.7)		(13.1)
Lattice | Intangible amortization - net of tax benefits
Business Acquisition [Line Items]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), basic		(0.4)													(1.4)		(3.6)
Lattice | Deferred revenue fair value adjustment
Business Acquisition [Line Items]
Revenue		0.0													2.4		(4.8)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), basic		0.0													1.8		(3.6)
Lattice | Transaction costs - net of tax benefits
Business Acquisition [Line Items]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor), basic		$ 0.0													$ 0.4		$ (0.4)

[1] See Note 1 Basis of Presentation and Description of Business for further detail regarding the elimination of the International lag reporting.