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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Adjusted EBITDA:	$ 217.9	$ 206.2	$ 419.2	$ 396.2
Depreciation and amortization	(141.3)	(145.0)	(285.3)	(290.4)
Interest expense - net	(57.8)	(55.0)	(141.5)	(108.9)
Benefit (provision) for income taxes	2.9	17.5	47.1	29.3
Other income (expense) - net	1.4	1.5	1.5	2.1
Equity in net income of affiliates	0.7	0.7	1.6	1.5
Net income (loss) attributable to non-controlling interest	(0.7)	(0.6)	(2.0)	(1.5)
Equity-based compensation	(18.2)	(24.8)	(36.1)	(45.3)
Restructuring charges	(3.3)	(4.6)	(6.7)	(8.8)
Merger, acquisition and divestiture-related operating costs	(0.8)	(1.4)	(1.0)	(4.0)
Transition costs	(15.2)	(11.0)	(32.6)	(19.4)
Other adjustments	(2.0)	(2.9)	(3.8)	(3.9)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc.	(16.4)	(19.4)	(39.6)	(53.1)
Operating segments
Segment Reporting Information [Line Items]
Depreciation and amortization	(32.3)	(27.5)	(63.6)	(52.7)
Corporate and other
Segment Reporting Information [Line Items]
Adjusted EBITDA:	(14.1)	(16.4)	(29.2)	(32.5)
Depreciation and amortization	(109.0)	(117.5)	(221.7)	(237.7)
North America | Operating segments
Segment Reporting Information [Line Items]
Adjusted EBITDA:	178.2	173.5	330.3	324.0
Depreciation and amortization	(26.2)	(22.4)	(51.7)	(42.5)
International | Operating segments
Segment Reporting Information [Line Items]
Adjusted EBITDA:	53.8	49.1	118.1	104.7
Depreciation and amortization	$ (6.1)	$ (5.1)	$ (11.9)	$ (10.2)