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Note 8 - Leases (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Finance Lease, Liability, Total	$ 13.3
Fixed Assets, Net [Member]
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total	19.0	$ 27.1
Short-term Debt and Current Portion of Long-term Debt and Long-term Debt [Member]
Finance Lease, Liability, Total	$ 13.5	$ 24.7
First Option to Extend Corporate Headquarters [Member]
Lessee, Leases, Number of Extensions	1
Lessee, Lease, Extension Lease Term (Year)	10 years
Second Option to Extend Corporate Headquarters [Member]
Lessee, Leases, Number of Extensions	2
Lessee, Lease, Extension Lease Term (Year)	5 years
Hyderabad, India Office [Member]
Lessee, Leases, Termination Period (Month)	6 months

X

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

Name:	us-gaap_FinanceLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, after accumulated amortization, of right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

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

X

- Definition

The extension lease term of operating and financing leases of the lessee.

+ References

No definition available.

+ Details

Name:	vrsk_LesseeLeaseExtensionLeaseTerm
Namespace Prefix:	vrsk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of extensions under the operating and finance leases of the lessee.

+ References

No definition available.

+ Details

Name:	vrsk_LesseeLeasesNumberOfExtensions
Namespace Prefix:	vrsk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The termination period for operating and finance leases of the lessee.

+ References

No definition available.

+ Details

Name:	vrsk_LesseeLeasesTerminationPeriod
Namespace Prefix:	vrsk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=vrsk_FixedAssetsNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=vrsk_ShorttermDebtAndCurrentPortionOfLongtermDebtAndLongtermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LeaseContractualTermAxis=vrsk_FirstOptionToExtendCorporateHeadquartersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LeaseContractualTermAxis=vrsk_SecondOptionToExtendCorporateHeadquartersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LeaseContractualTermAxis=vrsk_HyderabadIndiaOfficeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: