Condensed Consolidated Statements of Stockholder Equity (Deficit) (Unaudited) - USD ($) $ in Millions		Total		Dun & Bradstreet Corp	Total Stockholder Equity (Deficit)	Total Stockholder Equity (Deficit) Dun & Bradstreet Corp	Common Stock	Common Stock  Dun & Bradstreet Corp	Capital Surplus	Capital Surplus Dun & Bradstreet Corp	(Accumulated Deficit) Retained Earnings	(Accumulated Deficit) Retained Earnings Dun & Bradstreet Corp	Treasury Stock	Treasury Stock Dun & Bradstreet Corp	Cumulative Translation Adjustment	Cumulative Translation Adjustment Dun & Bradstreet Corp	Defined Benefit Postretirement Plans	Defined Benefit Postretirement Plans Dun & Bradstreet Corp	Cash Flow Hedging Derivative	Cash Flow Hedging Derivative Dun & Bradstreet Corp	Non-Controlling Interest	Non-Controlling Interest Dun & Bradstreet Corp
Balance at beginning of period at Dec. 31, 2018		$ (13.5)		$ (689.9)	$ (13.5)	$ (705.8)	$ 0.0	$ 0.8	$ 0.0	$ 332.8	$ (13.5)	$ 3,325.0	$ 0.0	$ (3,310.3)	$ 0.0	$ (235.5)	$ 0.0	$ (818.3)	$ 0.0	$ (0.3)	$ 0.0	$ 15.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(74.8)	[1]		(75.6)						(75.6)										0.8
Payment to non-controlling interest		(0.1)																			(0.1)
Equity-based compensation plans		11.7			11.7				11.7
Pension adjustments, net of tax expense (benefit)		65.4			65.4												65.4
Change in cumulative translation adjustment, net of tax expense (benefit)		5.9	[1],[2]		5.7										5.7						0.2
Derivative financial instruments, net of tax expense (benefit)		(0.1)	[1],[3]		(0.1)														(0.1)
Balance at end of period at Feb. 07, 2019		(681.9)			(698.7)		0.8		344.5		3,249.4		(3,310.3)		(229.8)		(752.9)		(0.4)		16.8
Balance at beginning of period at Dec. 31, 2018		(13.5)		$ (689.9)	(13.5)	$ (705.8)	0.0	$ 0.8	0.0	$ 332.8	(13.5)	$ 3,325.0	0.0	$ (3,310.3)	0.0	$ (235.5)	0.0	$ (818.3)	0.0	$ (0.3)	0.0	$ 15.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(270.1)	[1]		(272.0)						(272.0)										1.9
Take-Private Transaction		2,065.2			2,048.4				2,048.4												16.8
Capital / equity contribution		24.6			24.6				24.6
Preferred dividend	[4]	(32.0)			(32.0)				(32.0)
Payment to non-controlling interest		(3.2)																			(3.2)
Equity-based compensation plans		59.5			59.5				59.5
Change in cumulative translation adjustment, net of tax expense (benefit)		(16.9)	[1],[2]		(16.8)										(16.8)						(0.1)
Derivative financial instruments, net of tax expense (benefit)		(1.6)	[1],[3]		(1.6)														(1.6)
Balance at end of period at Jun. 30, 2019		1,812.0			1,796.6		0.0		2,100.5		(285.5)		0.0		(16.8)		0.0		(1.6)		15.4
Balance at beginning of period at Mar. 31, 2019		1,896.8			1,879.5		0.0		2,104.2		(223.5)		0.0		(0.8)		0.0		(0.4)		17.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(60.5)	[1]		(62.0)						(62.0)										1.5
Capital / equity contribution		24.6			24.6				24.6
Preferred dividend	[4]	(32.0)			(32.0)				(32.0)
Payment to non-controlling interest		(3.2)																			(3.2)
Equity-based compensation plans		3.7			3.7				3.7
Change in cumulative translation adjustment, net of tax expense (benefit)		(16.2)	[1],[2]		(16.0)										(16.0)						(0.2)
Derivative financial instruments, net of tax expense (benefit)		(1.2)	[1],[3]		(1.2)														(1.2)
Balance at end of period at Jun. 30, 2019		1,812.0			1,796.6		0.0		2,100.5		(285.5)		0.0		(16.8)		0.0		(1.6)		15.4
Balance at beginning of period at Dec. 31, 2019		1,577.7			1,519.9		0.0		2,116.9		(573.5)		0.0		(6.6)		(15.8)		(1.1)		57.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(99.9)	[1]		(101.5)						(101.5)										1.6
Accretion - Series A Preferred Stock		(36.1)			(36.1)				(36.1)
Preferred dividend	[4]	(64.1)			(64.1)				(64.1)
Payment to non-controlling interest		(0.3)																			(0.3)
Equity-based compensation plans		27.2			27.2				27.2
Pension adjustments, net of tax expense (benefit)		(0.1)			(0.1)												(0.1)
Change in cumulative translation adjustment, net of tax expense (benefit)		(14.9)	[1],[2]		(13.7)										(13.7)						(1.2)
Derivative financial instruments, net of tax expense (benefit)		(0.5)	[1],[3]		(0.5)														(0.5)
Balance at end of period at Jun. 30, 2020		1,389.0			1,331.1		0.0		2,043.9		(675.0)		0.0		(20.3)		(15.9)		(1.6)		57.9
Balance at beginning of period at Mar. 31, 2020		1,619.5			1,561.4		0.0		2,087.6		(500.0)		0.0		(8.3)		(15.9)		(2.0)		58.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(173.8)	[1]		(175.0)						(175.0)										1.2
Accretion - Series A Preferred Stock		(35.1)			(35.1)				(35.1)
Preferred dividend	[4]	(32.1)			(32.1)				(32.1)
Payment to non-controlling interest		(0.1)																			(0.1)
Equity-based compensation plans		23.5			23.5				23.5
Change in cumulative translation adjustment, net of tax expense (benefit)		(13.3)	[1],[2]		(12.0)										(12.0)						(1.3)
Derivative financial instruments, net of tax expense (benefit)		0.4	[1],[3]		0.4														0.4
Balance at end of period at Jun. 30, 2020		$ 1,389.0			$ 1,331.1		$ 0.0		$ 2,043.9		$ (675.0)		$ 0.0		$ (20.3)		$ (15.9)		$ (1.6)		$ 57.9

[1] See Note 1 "Basis of Presentation" for further discussion.

[2] Tax Expense (Benefit) of $(0.7) million, $$(1.9) million, $(0.9) million, $$(0.9) million, and less than $0.1 million for the Successor three months ended June 30, 2020 and 2019, for the Successor six months ended June 30, 2020, for the Successor period from January 1 to June 30, 2019, and for the Predecessor period from January 1 to February 7, 2019, respectively.

[3] Tax Expense (Benefit) of $0.1 million, $(0.4) million, $(0.2) million, $(0.5) million, and $(0.1) million for the Successor three months ended June 30, 2020 and 2019, for the Successor six months ended June 30, 2020, for the Successor period from January 1 to June 30, 2019, and for the Predecessor period from January 1 to February 7, 2019, respectively.

[4] Related to the preferred stock dividends declared by the Board of Directors of Dun & Bradstreet Holdings, Inc. (formerly Star Intermediate I, Inc.) on May 31, 2019, March 4, 2020 and May 14, 2020, respectively, associated with its cumulative Series A Preferred Stock. The dividend payments of $21.3 million, $10.7 million, $32 million and $32.1 million were made on June 19, 2019, June 28, 2019, March 27, 2020 and June 26, 2020, respectively. See further discussion in Note 17.