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Note 14 - Segment Reporting - Long-lived Assets By Country (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Total long-lived assets	$ 6,728.4	$ 6,767.6
UNITED STATES
Total long-lived assets	3,520.3	3,525.0
UNITED KINGDOM
Total long-lived assets	2,759.1	2,775.8
Other Countries [Member]
Total long-lived assets	$ 449.0	$ 466.8

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599

+ Details

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

X

- Details

Name:	srt_StatementGeographicalAxis=country_US
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: