Segment Information - Schedule of Revenue and Operating Income (Loss) by Segment (Details) - USD ($) $ in Millions	1 Months Ended			3 Months Ended								12 Months Ended
	Jun. 30, 2021	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
Segment Reporting Information [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
Revenue adjustment												4.8
Deferred revenue purchase accounting adjustments													21.1		138.9
Adjusted EBITDA		63.6										847.1	711.4		505.1
Depreciation and amortization		(11.1)	[1]									(615.9)	(537.8)	[1]	(487.1)	[1]
Interest expense - net		(5.2)										(205.7)	(270.4)		(301.0)
Dividends allocated to preferred stockholders		0.0	[1]									0.0	(64.1)	[1]	(114.0)	[1]
Benefit (provision) for income taxes		27.5	[1]									(23.4)	112.4	[1]	118.3	[1]
Other income (expense) - net		(86.0)	[1]									14.9	(11.6)	[1]	(153.5)	[1]
Equity in net income of affiliates		0.5	[1]									2.7	2.4	[1]	4.2	[1]
Net income (loss) attributable to non-controlling interest		(0.8)	[1]	(1.6)	(1.6)	(0.9)	(1.7)	(1.3)	(2.0)	(1.2)	(0.4)	(5.8)	(4.9)	[1]	(6.4)	[1]
Other incremental or reduced expenses and revenue from the application of purchase accounting		0.0										12.9	18.8		21.2
Equity-based compensation		(11.7)										(33.3)	(45.1)		(11.7)
Restructuring charges		(0.1)	[1]									(25.1)	(37.3)	[1],[2]	(52.3)	[1],[2]
Merger and acquisition-related operating costs		(52.0)										(14.1)	(14.1)		(161.1)
Transition costs		(0.3)										(11.6)	(31.9)		(32.3)
Legal reserve associated with significant legal and regulatory matters		0.0										(12.8)	(3.9)		0.2
Asset impairment		0.0										(1.6)	(4.5)		(3.7)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor)		(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)
Depreciation and amortization		11.1	[1]									615.9	537.8	[1]	487.1	[1]
Capital expenditures:		0.2										86.3	7.8		12.4
Additions to computer software and other intangibles:		5.1										170.7	115.2		57.4
In-place lease intangibles				7.1								7.1
Office Building In Jacksonville, FL
Segment Reporting Information [Line Items]
Consideration transferred	$ 76.6
In-place lease intangibles				$ 7.1								7.1
Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization		(7.3)										(72.3)	(54.6)		(42.3)
Depreciation and amortization		7.3										72.3	54.6		42.3
Capital expenditures:		0.3										86.2	7.7		11.4
Additions to computer software and other intangibles:		5.1										169.8	113.8		55.3
Corporate and other
Segment Reporting Information [Line Items]
Revenue		0.0										(4.8)	(21.1)		(138.9)
Adjusted EBITDA		(9.3)										(62.3)	(75.8)		(212.6)
Depreciation and amortization		(3.8)										(543.6)	(483.2)		(444.8)
Depreciation and amortization		3.8										543.6	483.2		444.8
Capital expenditures:		(0.1)										0.1	0.1		1.0
Additions to computer software and other intangibles:		0.0										0.9	1.4		2.1
North America | Operating Segments
Segment Reporting Information [Line Items]
Revenue		148.2										1,499.4	1,460.0		1,317.5
Adjusted EBITDA		60.4										715.3	696.2		629.9
Depreciation and amortization		(5.8)										(60.2)	(46.3)		(36.1)
Depreciation and amortization		5.8										60.2	46.3		36.1
Capital expenditures:		0.2										81.1	1.9		9.5
Additions to computer software and other intangibles:		4.3										144.0	107.4		48.8
International | Operating Segments
Segment Reporting Information [Line Items]
Revenue		30.5										671.0	299.8		260.4
Adjusted EBITDA		12.5										194.1	91.0		87.8
Depreciation and amortization		(1.5)										(12.1)	(8.3)		(6.2)
Depreciation and amortization		1.5										12.1	8.3		6.2
Capital expenditures:		0.1										5.1	5.8		1.9
Additions to computer software and other intangibles:		$ 0.8										$ 25.8	$ 6.4		$ 6.5

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

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