Acquisitions - Narrative (Details) - USD ($) $ in Millions								1 Months Ended	12 Months Ended					19 Months Ended
	Nov. 15, 2021	Nov. 05, 2021	Jan. 08, 2021	Sep. 11, 2020	Mar. 11, 2020	Jan. 07, 2020	Jul. 01, 2019	Feb. 07, 2019	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019		Jun. 15, 2023	Mar. 31, 2021
Business Acquisition [Line Items]
Transaction costs								$ 52.0	$ 14.1	$ 14.1		$ 161.1
Transaction costs									0.2
Term Loan Facility
Business Acquisition [Line Items]
Proceeds from borrowings on lines of credit								$ 0.0	$ 300.0	0.0	[1]	$ 2,479.4	[1]
Maximum
Business Acquisition [Line Items]
Amortization life (years)									14 years
Reacquired right
Business Acquisition [Line Items]
Weighted average amortization period (years)									15 years
Orb
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)						100.00%
Consideration transferred						$ 11.6
coAction.com
Business Acquisition [Line Items]
Consideration transferred					$ 9.6
Payments to acquire business				$ 4.8	$ 4.8
Lattice
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)							100.00%
Consideration transferred							$ 127.0
Transaction costs										0.6
Capital funding received in connection with acquisition							$ 100.0
Bisnode
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)			100.00%
Consideration transferred			$ 805.8
Weighted average amortization period (years)			13 years 7 months 6 days
Payments to acquire business			$ 646.9
Stock issued in acquisition (shares)			6,237,087
Cash consideration transferred from issuance of common and preferred shares			$ 158.9
Transaction costs									$ 0.4	$ 4.6
Contract with customer, asset, write-off									2.9
Contract with customer, liability, write-off									0.8
Increase in goodwill during period									7.0
Bisnode | Term Loan Facility
Business Acquisition [Line Items]
Proceeds from borrowings on lines of credit			300.0
Bisnode | Foreign Exchange Contract
Business Acquisition [Line Items]
Gain (loss) on sale of derivatives			$ 21.0
Bisnode | Maximum
Business Acquisition [Line Items]
Weighted average amortization period (years)			15 years
Bisnode | Minimum
Business Acquisition [Line Items]
Weighted average amortization period (years)			6 years
Bisnode | Customer Relationships Reclassed to Reacquired Right
Business Acquisition [Line Items]
Intangible assets:			$ 64.7
Bisnode | Reacquired right
Business Acquisition [Line Items]
Amortization life (years)			15 years
Weighted average amortization period (years)			15 years
Intangible assets:									270.0						$ 271.0
Eyeota
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)		100.00%
Consideration transferred		$ 172.3
Transaction costs									$ 3.0
Weighted average amortization period (years)									10 years 1 month 6 days
Eyeota | Minimum
Business Acquisition [Line Items]
Amortization life (years)									2 years
NetWise
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)	100.00%
Consideration transferred	$ 69.8
Transaction costs									$ 0.4
Weighted average amortization period (years)									13 years 2 months 12 days
Payments to acquire business	$ 62.9
Payment due	19 months
NetWise | Forecast
Business Acquisition [Line Items]
Payments to acquire business														$ 6.9
NetWise | Maximum
Business Acquisition [Line Items]
Amortization life (years)									15 years
NetWise | Minimum
Business Acquisition [Line Items]
Amortization life (years)									2 years

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