Segment Information - Schedule of Reconciliation of Segment Adjusted EBITDA to Net Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Revenue	$ 585.2	$ 576.2	$ 1,165.0	$ 1,140.7
Adjusted EBITDA	206.1	217.9	417.0	419.2
Depreciation and amortization	(146.5)	(141.3)	(291.2)	(285.3)
Interest expense - net	(48.5)	(57.8)	(99.9)	(141.5)
Other income (expense) - net	1.7	1.4	3.0	1.5
Equity-based compensation	(15.8)	(18.2)	(30.5)	(36.1)
Restructuring charges	(2.0)	(3.3)	(4.9)	(6.7)
Merger, acquisition and divestiture-related operating costs	(4.4)	(0.8)	(6.9)	(1.0)
Transition costs	(11.3)	(15.2)	(20.9)	(32.6)
Other adjustments	(13.3)	(2.0)	(14.5)	(3.8)
Income (loss) before provision (benefit) for income taxes and equity in net income of affiliates	(34.0)	(19.3)	(48.8)	(86.3)
Benefit (provision) for income taxes	1.2	2.9	0.8	47.1
Equity in net income of affiliates	0.2	0.7	0.6	1.6
Net income (loss) attributable to non-controlling interest	(1.1)	(0.7)	(2.1)	(2.0)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc.	(33.7)	(16.4)	(49.5)	(39.6)
Operating Segments
Segment Reporting Information [Line Items]
Revenue	585.2	576.2	1,165.0	1,140.7
Operating costs	368.9	344.2	722.0	692.3
Adjusted EBITDA	216.3	232.0	443.0	448.4
Depreciation and amortization	(43.5)	(32.3)	(84.0)	(63.6)
Other EBITDA - Corporate and Other
Segment Reporting Information [Line Items]
Adjusted EBITDA	(10.2)	(14.1)	(26.0)	(29.2)
Depreciation and amortization	(103.0)	(109.0)	(207.2)	(221.7)
North America | Operating Segments
Segment Reporting Information [Line Items]
Revenue	397.9	404.6	795.9	791.2
Operating costs	240.6	226.4	472.4	460.9
Adjusted EBITDA	157.3	178.2	323.5	330.3
Depreciation and amortization	(34.6)	(26.2)	(67.8)	(51.7)
International | Operating Segments
Segment Reporting Information [Line Items]
Revenue	187.3	171.6	369.1	349.5
Operating costs	128.3	117.8	249.6	231.4
Adjusted EBITDA	59.0	53.8	119.5	118.1
Depreciation and amortization	$ (8.9)	$ (6.1)	$ (16.2)	$ (11.9)