Segment Information - Revenue and Operating Income (Loss) by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenue	$ 588.5	$ 556.3	$ 1,683.6	$ 1,629.6
Adjusted EBITDA:	235.4	223.0	631.6	613.1
Depreciation and amortization	(146.7)	(145.1)	(437.1)	(441.5)
Interest expense - net	(55.3)	(48.6)	(164.2)	(137.1)
Benefit (provision) for income taxes	11.2	4.2	40.5	13.6
Other income (expense) - net	(3.3)	8.8	(1.2)	10.7
Equity in net income of affiliates	0.6	0.5	2.1	1.8
Net income (loss) attributable to non-controlling interest	(0.9)	(2.4)	(2.4)	(5.7)
Equity-based compensation	(20.8)	(17.9)	(66.1)	(43.9)
Restructuring charges	(1.6)	(6.6)	(10.4)	(14.3)
Merger, acquisition and divestiture-related operating costs	(1.4)	(5.3)	(5.4)	(17.3)
Transition costs	(11.7)	(4.8)	(31.1)	(13.7)
Other adjustments	(1.1)	2.2	(5.0)	9.2
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., Diluted	4.4	8.0	(48.7)	(25.1)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., Basic	4.4	8.0	(48.7)	(25.1)
Depreciation and amortization	146.7	145.1	437.1	441.5
Capital expenditures:	1.1	2.7	3.7	10.2
Additions to computer software and other intangibles:	34.3	51.3	126.2	143.0
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	(29.4)	(20.7)	(82.1)	(64.3)
Depreciation and amortization	29.4	20.7	82.1	64.3
Capital expenditures:	1.1	2.6	3.2	10.1
Additions to computer software and other intangibles:	22.4	48.6	105.6	136.0
Corporate and other
Segment Reporting Information [Line Items]
Adjusted EBITDA:	(15.7)	(17.0)	(48.2)	(43.2)
Depreciation and amortization	(117.3)	(124.4)	(355.0)	(377.2)
Depreciation and amortization	117.3	124.4	355.0	377.2
Capital expenditures:	0.0	0.1	0.5	0.1
Additions to computer software and other intangibles:	11.9	2.7	20.6	7.0
North America | Operating segments
Segment Reporting Information [Line Items]
Revenue	421.4	403.6	1,187.7	1,152.2
Adjusted EBITDA:	195.6	188.4	519.6	503.1
Depreciation and amortization	(24.3)	(16.9)	(66.8)	(53.5)
Depreciation and amortization	24.3	16.9	66.8	53.5
Capital expenditures:	0.5	1.5	1.9	7.3
Additions to computer software and other intangibles:	16.4	39.4	85.1	112.5
International | Operating segments
Segment Reporting Information [Line Items]
Revenue	167.1	152.7	495.9	477.4
Adjusted EBITDA:	55.5	51.6	160.2	153.2
Depreciation and amortization	(5.1)	(3.8)	(15.3)	(10.8)
Depreciation and amortization	5.1	3.8	15.3	10.8
Capital expenditures:	0.6	1.1	1.3	2.8
Additions to computer software and other intangibles:	$ 6.0	$ 9.2	$ 20.5	$ 23.5