Segment Information - Schedule of Reconciliation of Segment Adjusted EBITDA to Net Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Adjusted EBITDA:	$ 247.4	$ 235.4	$ 666.6	$ 631.6
Depreciation and amortization	(144.8)	(146.7)	(430.1)	(437.1)
Interest expense - net	(59.2)	(55.3)	(200.7)	(164.2)
Benefit (provision) for income taxes	1.8	11.2	48.9	40.5
Other income (expense) - net	(0.9)	(3.3)	0.6	(1.2)
Equity in net income of affiliates	0.3	0.6	1.9	2.1
Net income (loss) attributable to non-controlling interest	(1.0)	(0.9)	(3.0)	(2.4)
Equity-based compensation	(16.3)	(20.8)	(52.4)	(66.1)
Restructuring charges	(7.8)	(1.6)	(14.5)	(10.4)
Merger, acquisition and divestiture-related operating costs	(0.4)	(1.4)	(1.4)	(5.4)
Transition costs	(14.7)	(11.7)	(47.3)	(31.1)
Other adjustments	(1.2)	(1.1)	(5.0)	(5.0)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc.	3.2	4.4	(36.4)	(48.7)
Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	(35.2)	(29.4)	(98.8)	(82.1)
Corporate and other
Segment Reporting Information [Line Items]
Adjusted EBITDA:	(19.4)	(15.7)	(48.6)	(48.2)
Depreciation and amortization	(109.6)	(117.3)	(331.3)	(355.0)
North America | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA:	207.7	195.6	538.0	519.6
Depreciation and amortization	(28.4)	(24.3)	(80.1)	(66.8)
International | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA:	59.1	55.5	177.2	160.2
Depreciation and amortization	$ (6.8)	$ (5.1)	$ (18.7)	$ (15.3)