Take-Private Transaction - Pro Forma Information (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended								12 Months Ended
	Feb. 07, 2019	[1]	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Business Acquisition [Line Items]
Revenue	$ 178.7		$ 598.3	$ 541.9	$ 520.9	$ 504.5	$ 479.9	$ 444.4	$ 418.7	$ 395.7	$ 2,165.6	$ 1,738.7	[1]	$ 1,439.0	[1]	$ 1,716.4
Pro forma revenue											$ 2,210.1	$ 2,113.0
Pro forma adjustments - net of tax effect
Blended statutory tax rate (as a percent)														22.30%		22.30%
Dun & Bradstreet
Business Acquisition [Line Items]
Revenue														$ 178.7		$ 1,716.4
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.(Successor)														(75.6)		288.1
Take-Private Acquisition, Dun & Bradstreet
Business Acquisition [Line Items]
Revenue														1,413.9		0.0
Pro forma revenue														1,726.9		1,564.2
Reported net income (loss) attributable to Dun & Bradstreet Holdings, Inc.(Successor)														(674.0)		0.0
Pro forma adjustments - net of tax effect
Pro forma net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor)														(473.9)		(583.7)
Take-Private Acquisition, Dun & Bradstreet | Deferred revenue fair value adjustment
Business Acquisition [Line Items]
Revenue														134.3		(152.2)
Pro forma adjustments - net of tax effect
Pro forma net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor)														104.4		(118.3)
Take-Private Acquisition, Dun & Bradstreet | Incremental amortization of intangibles
Pro forma adjustments - net of tax effect
Pro forma net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor)														(15.5)		(350.7)
Take-Private Acquisition, Dun & Bradstreet | Amortization of deferred commissions
Pro forma adjustments - net of tax effect
Pro forma net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor)														(2.0)		16.9
Take-Private Acquisition, Dun & Bradstreet | Transaction costs
Pro forma adjustments - net of tax effect
Pro forma net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor)														154.9		(114.5)
Take-Private Acquisition, Dun & Bradstreet | Pension expense adjustment
Pro forma adjustments - net of tax effect
Pro forma net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor)														69.5		38.9
Take-Private Acquisition, Dun & Bradstreet | Equity-based compensation adjustment
Pro forma adjustments - net of tax effect
Pro forma net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor)														8.1		0.0
Take-Private Acquisition, Dun & Bradstreet | Preferred dividend adjustment
Pro forma adjustments - net of tax effect
Pro forma net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor)														(21.8)		(128.7)
Take-Private Acquisition, Dun & Bradstreet | Incremental interest expense and facility cost adjustment
Pro forma adjustments - net of tax effect
Pro forma net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor)														$ (21.9)		$ (215.4)

[1] See Note 1 Basis of Presentation and Description of Business for further detail regarding the elimination of the International lag reporting.