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Note 19 - Segment Reporting - Long-lived Assets By Country (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Total long-lived assets	$ 3,556.0	$ 6,036.0
UNITED STATES
Total long-lived assets	2,455.7	2,876.5
UNITED KINGDOM
Total long-lived assets	597.9	2,428.9
Other Countries [Member]
Total long-lived assets	$ 502.4	$ 730.6

X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

+ Details

Name:	us-gaap_NoncurrentAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=vrsk_OtherCountriesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: