Segment Information - Revenue and Operating Income (Loss) by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenue	$ 554.7	$ 537.3	$ 1,095.1	$ 1,073.3
Adjusted EBITDA:	206.2	200.0	396.2	390.1
Depreciation and amortization	(145.0)	(147.0)	(290.4)	(296.4)
Interest expense - net	(55.0)	(41.6)	(108.9)	(88.5)
Benefit (provision) for income taxes	17.5	0.1	29.3	9.4
Other income (expense) - net	1.5	11.2	2.1	1.9
Equity in net income of affiliates	0.7	0.6	1.5	1.3
Net income (loss) attributable to non-controlling interest	(0.6)	(1.8)	(1.5)	(3.3)
Equity-based compensation	(24.8)	(15.3)	(45.3)	(26.0)
Restructuring charges	(4.6)	(2.4)	(8.8)	(7.7)
Merger, acquisition and divestiture-related operating costs	(1.4)	(6.9)	(4.0)	(12.0)
Transition costs	(11.0)	(2.0)	(19.4)	(8.9)
Other adjustments	(2.9)	3.3	(3.9)	7.0
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., Basic	(19.4)	(1.8)	(53.1)	(33.1)
Depreciation and amortization	145.0	147.0	290.4	296.4
Capital expenditures:	1.3	3.4	2.6	7.5
Additions to computer software and other intangibles:	47.3	48.1	91.9	91.7
Finance lease, right-of-use asset	7.2		7.2		$ 4.1
Finance lease, liability					$ 4.1
Finance lease, liability, paid off	11.3		11.3
Operating segments
Segment Reporting Information [Line Items]
Depreciation and amortization	(27.5)	(23.2)	(52.7)	(43.7)
Depreciation and amortization	27.5	23.2	52.7	43.7
Capital expenditures:	1.3	3.4	2.1	7.5
Additions to computer software and other intangibles:	43.8	45.3	83.2	87.4
Corporate and other
Segment Reporting Information [Line Items]
Adjusted EBITDA:	(16.4)	(7.9)	(32.5)	(26.2)
Depreciation and amortization	(117.5)	(123.8)	(237.7)	(252.7)
Depreciation and amortization	117.5	123.8	237.7	252.7
Capital expenditures:	0.0	0.0	0.5	0.0
Additions to computer software and other intangibles:	3.5	2.8	8.7	4.3
North America | Operating segments
Segment Reporting Information [Line Items]
Revenue	391.6	381.3	766.3	748.6
Adjusted EBITDA:	173.5	161.4	324.0	314.7
Depreciation and amortization	(22.4)	(19.5)	(42.5)	(36.7)
Depreciation and amortization	22.4	19.5	42.5	36.7
Capital expenditures:	0.8	2.5	1.4	5.8
Additions to computer software and other intangibles:	37.3	37.5	68.7	73.1
International | Operating segments
Segment Reporting Information [Line Items]
Revenue	163.1	156.0	328.8	324.7
Adjusted EBITDA:	49.1	46.5	104.7	101.6
Depreciation and amortization	(5.1)	(3.7)	(10.2)	(7.0)
Depreciation and amortization	5.1	3.7	10.2	7.0
Capital expenditures:	0.5	0.9	0.7	1.7
Additions to computer software and other intangibles:	$ 6.5	$ 7.8	$ 14.5	$ 14.3