Take-Private Transaction - Purchase Price Allocation (Details) - USD ($) $ in Millions	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2019	Dec. 31, 2020	[1]	Feb. 08, 2019
Initial purchase price allocation:
Goodwill	$ 2,841.7	$ 3,493.3	$ 2,841.7	$ 2,857.9
Customer relationships
Business Acquisition [Line Items]
Weighted average amortization period (years)		17 years
Partnership agreements
Business Acquisition [Line Items]
Weighted average amortization period (years)		14 years
Database
Business Acquisition [Line Items]
Weighted average amortization period (years)		17 years
Take-Private Acquisition, Dun & Bradstreet
Business Acquisition [Line Items]
Weighted average amortization period (years)		16 years 6 months
Initial purchase price allocation:
Cash	117.7		117.7			$ 117.7
Accounts receivable	266.1		266.1			267.8
Other current assets	46.4		46.4			46.8
Total current assets	430.2		430.2			432.3
Goodwill	2,787.6		2,787.6			2,797.6
Property, plant & equipment	30.3		30.3			30.3
Right of use asset	111.3		111.3			103.9
Other	34.3		34.3			34.4
Total assets acquired	9,386.3		9,386.3			9,333.3
Accounts payable	74.2		74.2			74.2
Deferred revenue	397.8		397.8			398.4
Accrued liabilities	237.8		237.8			240.1
Short-term pension and other accrued benefits	106.0		106.0			106.0
Other current liabilities	45.8		45.8			41.1
Total current liabilities	861.6		861.6			859.8
Long-term pension and postretirement obligations	221.0		221.0			213.6
Deferred tax liability	1,380.6		1,380.6			1,388.3
Long-term debt	625.1		625.1			625.1
Other liabilities	169.0		169.0			161.0
Total liabilities assumed	3,257.3		3,257.3			3,247.8
Non-controlling interest	60.3		60.3			16.8
Less: debt repayment	637.5		637.5			637.5
Amounts paid to equity holders	5,431.2		5,431.2			5,431.2
Measurement period adjustments
Cash	0.0
Accounts receivable	(1.7)
Other current assets	(0.4)
Total current assets	(2.1)
Goodwill	(10.0)		(10.0)
Property, plant & equipment	0.0
Right of use asset	7.4
Other	(0.1)
Total assets acquired	53.0
Accounts payable	0.0
Deferred revenue	(0.6)
Accrued liabilities	(2.3)
Short-term pension and other accrued benefits	0.0
Other current liabilities	4.7
Total current liabilities	1.8
Long-term pension and postretirement obligations	7.4
Deferred tax liability	(7.7)
Long-term debt	0.0
Other liabilities	8.0
Total liabilities assumed	9.5
Non-controlling interest	43.5
Less: debt repayment	0.0
Amounts paid to equity holders	0.0
Take-Private Acquisition, Dun & Bradstreet | Trademark
Initial purchase price allocation:
Intangible assets:	1,275.8		1,275.8			1,200.8
Measurement period adjustments
Intangible assets:	75.0
Take-Private Acquisition, Dun & Bradstreet | Customer relationships
Business Acquisition [Line Items]
Weighted average amortization period (years)		16 years 10 months 24 days
Initial purchase price allocation:
Intangible assets:	2,388.5		2,388.5			2,589.0
Measurement period adjustments
Intangible assets:	(200.5)
Take-Private Acquisition, Dun & Bradstreet | Partnership agreements
Business Acquisition [Line Items]
Weighted average amortization period (years)		14 years 3 months 18 days
Initial purchase price allocation:
Intangible assets:	230.3		230.3			0.0
Measurement period adjustments
Intangible assets:	230.3
Take-Private Acquisition, Dun & Bradstreet | Computer software
Business Acquisition [Line Items]
Weighted average amortization period (years)		7 years 9 months 18 days
Initial purchase price allocation:
Intangible assets:	376.0		376.0			376.0
Measurement period adjustments
Intangible assets:	0.0
Take-Private Acquisition, Dun & Bradstreet | Database
Business Acquisition [Line Items]
Weighted average amortization period (years)		17 years
Initial purchase price allocation:
Intangible assets:	1,722.0		$ 1,722.0			$ 1,769.0
Measurement period adjustments
Intangible assets:	$ (47.0)

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