Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue		$ 537.3	$ 520.9	$ 1,073.3	$ 1,025.4
Cost of services (exclusive of depreciation and amortization)		181.6	167.3	358.3	328.2
Selling and administrative expenses		176.6	164.3	364.8	344.1
Depreciation and amortization		147.0	152.3	296.4	302.0
Restructuring charges		2.4	10.1	7.7	15.9
Operating costs		507.6	494.0	1,027.2	990.2
Operating income (loss)		29.7	26.9	46.1	35.2
Interest income		0.3	0.2	0.6	0.3
Interest expense		(41.9)	(48.0)	(89.1)	(96.9)
Other income (expense) - net		11.2	12.4	1.9	19.2
Non-operating income (expense) - net		(30.4)	(35.4)	(86.6)	(77.4)
Income (loss) before provision (benefit) for income taxes and equity in net income of affiliates		(0.7)	(8.5)	(40.5)	(42.2)
Less: provision (benefit) for income taxes		(0.1)	43.0	(9.4)	33.2
Equity in net income of affiliates		0.6	0.7	1.3	1.3
Net income (loss)		0.0	(50.8)	(29.8)	(74.1)
Less: net (income) loss attributable to the non-controlling interest		(1.8)	(0.9)	(3.3)	(2.6)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., Basic		(1.8)	(51.7)	(33.1)	(76.7)
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc., Diluted		$ (1.8)	$ (51.7)	$ (33.1)	$ (76.7)
Basic earnings (loss) per share of common stock attributable to Dun & Bradstreet Holdings, Inc. (USD per share)		$ 0	$ (0.12)	$ (0.08)	$ (0.18)
Diluted earnings (loss) per share of common stock attributable to Dun & Bradstreet Holdings, Inc. (USD per share)		$ 0	$ (0.12)	$ (0.08)	$ (0.18)
Weighted average number of shares outstanding-basic (shares)		429,137,384	428,884,721	428,959,588	428,695,323
Weighted average number of shares outstanding-diluted (shares)		429,137,384	428,884,721	428,959,588	428,695,323
Other comprehensive income (loss), net of income taxes:
Net income (loss)		$ 0.0	$ (50.8)	$ (29.8)	$ (74.1)
Foreign currency translation adjustments, net of tax	[1]	(90.6)	16.4	(126.9)	(32.9)
Net investment hedge derivative, net of tax	[2]	5.5	0.0	5.5	0.0
Cash flow hedge derivative, net of tax expense (benefit)	[3]	7.3	(1.0)	30.9	0.8
Defined benefit pension plans:
Prior service credit (cost), net of tax expense (benefit)	[4]	(0.1)	(0.1)	(0.2)	(0.1)
Net actuarial gain (loss), net of tax expense (benefit)	[5]	0.0	0.5	0.0	0.9
Total other comprehensive income (loss), net of tax		(77.9)	15.8	(90.7)	(31.3)
Comprehensive income (loss), net of tax		(77.9)	(35.0)	(120.5)	(105.4)
Less: comprehensive (income) loss attributable to the non-controlling interest		1.7	(1.8)	0.2	(4.2)
Comprehensive income (loss) attributable to Dun & Bradstreet Holdings, Inc.		$ (76.2)	$ (36.8)	$ (120.3)	$ (109.6)

[1] Tax Expense (Benefit) of $(2.0) million and $1.9 million for the three months ended June 30, 2022 and 2021, respectively. Tax Expense (Benefit) of $(2.9) million and $3.0 million for the six months ended June 30, 2022 and 2021, respectively.(2)Tax Expense (Benefit) of $2.0 million for the three months ended June 30, 2022. Tax Expense (Benefit) of $2.0 million for the six months ended June 30, 2022.

[2] Tax Expense (Benefit) of $2.0 million for the three months ended June 30, 2022. Tax Expense (Benefit) of $2.0 million for the six months ended June 30, 2022.

[3] Tax Expense (Benefit) of $2.7 million and $0.4 million for the three months ended June 30, 2022 and 2021, respectively. Tax Expense (Benefit) of $11.4 million and $0.3 million for the six months ended June 30, 2022 and 2021, respectively.

[4] Tax Expense (Benefit) of less than $(0.1) million and less than $(0.1) million for the three months ended June 30, 2022 and 2021, respectively. Tax Expense (Benefit) of $(0.1) million and $(0.1) million for the six months ended June 30, 2022 and 2021, respectively.

[5] Tax Expense (Benefit) of less than $0.1 million for the three months ended June 30, 2021. Tax Expense (Benefit) of $0.2 million for the six months ended June 30, 2021.