Segment Information - Schedule of Revenue and Operating Income (Loss) by Segment (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenue		$ 2,224.6	$ 2,165.6	$ 1,738.7
Revenue adjustment			4.8
Deferred revenue purchase accounting adjustments				21.1
Adjusted EBITDA:		863.5	847.1	711.4
Depreciation and amortization		(587.2)	(615.9)	(537.8)
Interest expense - net		(191.0)	(205.7)	(270.4)
Dividends allocated to preferred stockholders		0.0	0.0	(64.1)
Benefit (provision) for income taxes		28.8	(23.4)	112.4
Other income (expense) - net		13.9	14.9	(11.6)
Equity in net income of affiliates		2.5	2.7	2.4
Net income (loss) attributable to non-controlling interest		(6.4)	(5.8)	(4.9)
Equity-based compensation		(66.0)	(33.3)	(45.1)
Restructuring charges		(20.5)	(25.1)	(37.3)
Merger and acquisition-related operating costs		(23.4)	(14.1)	(14.1)
Transition costs		(24.4)	(11.6)	(31.9)
Other adjustments		7.9	(1.5)	10.4
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc.		(2.3)	(71.7)	(180.6)
Depreciation and amortization		587.2	615.9	537.8
Capital expenditures:		12.6	86.3	7.8
Additions to computer software and other intangibles:		205.3	170.7	115.2
In-place lease intangibles		7.1
Office Building In Jacksonville, FL
Segment Reporting Information [Line Items]
Consideration transferred	$ 76.6
In-place lease intangibles			7.1
Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization		(86.4)	(72.3)	(54.6)
Depreciation and amortization		86.4	72.3	54.6
Capital expenditures:		12.5	86.2	7.7
Additions to computer software and other intangibles:		192.3	169.8	113.8
Corporate and other
Segment Reporting Information [Line Items]
Revenue		0.0	(4.8)	(21.1)
Adjusted EBITDA:		(56.7)	(62.3)	(75.8)
Depreciation and amortization		(500.8)	(543.6)	(483.2)
Depreciation and amortization		500.8	543.6	483.2
Capital expenditures:		0.1	0.1	0.1
Additions to computer software and other intangibles:		13.0	0.9	1.4
North America | Operating Segments
Segment Reporting Information [Line Items]
Revenue		1,587.1	1,499.4	1,460.0
Adjusted EBITDA:		718.0	715.3	696.2
Depreciation and amortization		(71.4)	(60.2)	(46.3)
Depreciation and amortization		71.4	60.2	46.3
Capital expenditures:		8.5	81.1	1.9
Additions to computer software and other intangibles:		161.8	144.0	107.4
International | Operating Segments
Segment Reporting Information [Line Items]
Revenue		637.5	671.0	299.8
Adjusted EBITDA:		202.2	194.1	91.0
Depreciation and amortization		(15.0)	(12.1)	(8.3)
Depreciation and amortization		15.0	12.1	8.3
Capital expenditures:		4.0	5.1	5.8
Additions to computer software and other intangibles:		$ 30.5	$ 25.8	$ 6.4