Segment Information - Schedule of Revenue and Operating Income (Loss) by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Revenue	$ 536.0	$ 504.5
Adjusted EBITDA:	190.1	185.6
Depreciation and amortization	(149.4)	(149.7)
Interest expense - net	(46.9)	(48.8)
Benefit (provision) for income taxes	9.3	9.8
Other income (expense) - net	(9.3)	6.8
Equity in net income of affiliates	0.7	0.6
Net income (loss) attributable to non-controlling interest	(1.5)	(1.7)
Other incremental or reduced expenses and revenue from the application of purchase accounting	3.9	0.7
Equity-based compensation	(10.7)	(7.6)
Restructuring charges	(5.3)	(5.8)
Merger, acquisition and divestiture-related operating costs	(5.1)	(3.1)
Transition costs	(6.9)	(0.9)
Legal expense associated with significant legal and regulatory matters	(0.2)	(9.9)
Asset impairment	0.0	(1.0)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., Basic	(31.3)	(25.0)
Capital expenditures:	4.1	1.2
Additions to computer software and other intangibles:	43.6	42.4
Operating segments
Segment Reporting Information [Line Items]
Depreciation and amortization	(20.5)	(15.4)
Capital expenditures:	4.1	1.2
Additions to computer software and other intangibles:	42.1	42.2
Corporate and other
Segment Reporting Information [Line Items]
Revenue	0.0	(4.8)
Adjusted EBITDA:	(18.3)	(16.9)
Depreciation and amortization	(128.9)	(134.3)
Capital expenditures:	0.0	0.0
Additions to computer software and other intangibles:	1.5	0.2
North America | Operating segments
Segment Reporting Information [Line Items]
Revenue	367.3	339.4
Adjusted EBITDA:	153.3	151.0
Depreciation and amortization	(17.2)	(12.6)
Capital expenditures:	3.3	0.6
Additions to computer software and other intangibles:	35.6	34.9
International | Operating segments
Segment Reporting Information [Line Items]
Revenue	168.7	169.9
Adjusted EBITDA:	55.1	51.5
Depreciation and amortization	(3.3)	(2.8)
Capital expenditures:	0.8	0.6
Additions to computer software and other intangibles:	$ 6.5	$ 7.3