Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Millions, $ in Millions		1 Months Ended		12 Months Ended
		Feb. 07, 2019		Dec. 31, 2021		Dec. 31, 2020	[1]	Dec. 31, 2019
Income Statement [Abstract]
Revenue		$ 178.7	[1]	$ 2,165.6		$ 1,738.7		$ 1,439.0	[1]
Cost of services (exclusive of depreciation and amortization)		56.7	[1]	664.3		548.2		463.7	[1]
Selling and administrative expenses		122.4	[1]	714.7		559.8		657.6	[1]
Depreciation and amortization		11.1	[1]	615.9		537.8		487.1	[1]
Restructuring charges		0.1	[1]	25.1		37.3	[2]	52.3	[1],[2]
Operating costs		190.3	[1]	2,020.0		1,683.1		1,660.7	[1]
Operating income (loss)		(11.6)	[1]	145.6		55.6		(221.7)	[1]
Interest income		0.3	[1]	0.7		0.7		2.5	[1]
Interest expense		(5.5)	[1]	(206.4)		(271.1)		(303.5)	[1]
Other income (expense) - net		(86.0)	[1]	14.9		(11.6)		(153.5)	[1]
Non-operating income (expense) - net		(91.2)	[1]	(190.8)		(282.0)		(454.5)	[1]
Income (loss) before provision (benefit) for income taxes and equity in net income of affiliates		(102.8)	[1]	(45.2)		(226.4)		(676.2)	[1]
Less: provision (benefit) for income taxes		(27.5)	[1]	23.4		(112.4)		(118.3)	[1]
Equity in net income of affiliates		0.5	[1]	2.7		2.4		4.2	[1]
Net income (loss)		(74.8)	[1]	(65.9)		(111.6)	[2]	(553.7)	[1],[2]
Less: net (income) loss attributable to the non-controlling interest		(0.8)	[1]	(5.8)		(4.9)		(6.4)	[1]
Less: Dividends allocated to preferred stockholders		0.0	[1]	0.0		(64.1)		(114.0)	[1]
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor)		$ (75.6)		$ (71.7)		$ (180.6)		$ (674.1)
Basic earnings (loss) per share of common stock:
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor)		$ (2.04)	[1]	$ (0.17)		$ (0.49)		$ (2.14)	[1]
Diluted earnings (loss) per share of common stock:
Net income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor)		$ (2.04)	[1]	$ (0.17)		$ (0.49)		$ (2.14)	[1]
Weighted average number of shares outstanding - basic (shares)		37.2	[1]	428.7		367.1		314.5	[1]
Weighted average number of shares outstanding - diluted (shares)		37.2	[1]	428.7		367.1		314.5	[1]
Other comprehensive income (loss), net of income taxes:
Net income (loss)		$ (74.8)	[1]	$ (65.9)		$ (111.6)	[2]	$ (553.7)	[1],[2]
Foreign currency translation adjustments, net of tax	[3]	5.9		(76.6)		28.5		(1.9)	[1]
Defined benefit pension plans:
Prior service credit (cost), net of tax expense (benefit)		(0.1)		(0.2)	[4]	(0.8)	[4]	2.3	[1],[4]
Net actuarial gain (loss), net of tax expense (benefit)	[5]	65.5	[1]	108.6		(95.5)		(26.3)	[1]
Derivative financial instrument, net of tax expense (benefit)	[6]	(0.1)	[1]	7.8		0.7		(1.1)	[1]
Total other comprehensive income (loss), net of tax		71.2	[1]	39.6		(67.1)		(27.0)	[1]
Comprehensive income (loss), net of tax		(3.6)	[1]	(26.3)		(178.7)		(580.7)	[1]
Less: comprehensive (income) loss attributable to the non-controlling interest		(1.0)	[1]	(8.0)		(8.1)		(3.6)	[1]
Comprehensive income (loss) attributable to Dun & Bradstreet Holdings, Inc. (Successor) / The Dun & Bradstreet Corporation (Predecessor)		$ (4.6)	[1]	$ (34.3)		$ (186.8)		$ (584.3)	[1]

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

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

[3] Tax Expense (Benefit) of $(1.6) million, $2.9 million, $1.8 million, and less than $0.1 million for the Successor year ended December 31, 2021, Successor year ended December 31, 2020, Successor period from January 1 to December 31, 2019, and for the Predecessor period from January 1 to February 7, 2019, respectively.

[4] Tax Expense (Benefit) of $0.1 million, $(0.2) million, and $0.8 million for the Successor year ended December 31, 2021, Successor year ended December 31, 2020, and for the Successor period from January 1 to December 31, 2019, respectively.

[5] Tax Expense (Benefit) of $38.9 million, $(32.2) million, $(8.1) million, and $22.2 million for the Successor year ended December 31, 2021, Successor year ended December 31, 2020, Successor period from January 1 to December 31, 2019, and for the Predecessor period from January 1 to February 7, 2019, respectively.

[6] Tax Expense (Benefit) of $2.8 million, $0.2 million, $(0.4) million, and $(0.1) million, for the Successor year ended December 31, 2021, Successor year ended December 31, 2020, Successor period from January 1 to December 31, 2019, and for the Predecessor period from January 1 to February 7, 2019, respectively.