Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684

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Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585

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- Definition

This element represents the cash inflow during the period from the sale of a component of the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585

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- Definition

The percent ownership of equity securities without readily determinable fair value.

+ References

No definition available.

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Namespace Prefix:	vrsk_
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Note 7 - Dispositions (Details Textual) - USD ($) $ in Millions			3 Months Ended		9 Months Ended
	Feb. 14, 2020	Feb. 01, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	May 25, 2021
Payments to Acquire Investments, Total			$ 6.0	$ (0.0)	$ 21.1	$ 63.8
Background Screening Business [Member]
Proceeds from Divestiture of Businesses, Net of Cash Divested, Total	$ 23.1
Background Screening Business [Member] \| Other Operating Income (Expense) [Member]
Gain (Loss) on Disposition of Business						15.9
Data Warehouse Business [Member] \| Other Operating Income (Expense) [Member]
Gain (Loss) on Disposition of Business						$ 3.5
Vexcel Group, Inc. [Member]
Payments to Acquire Investments, Total		$ 63.8
Equity Securities Without Readily Determinable Fair Value, Percentage		35.00%					3.70%