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Note 14 - Segment Reporting - Long-lived Assets By Country (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Total long-lived assets | $ 3,460.9 | $ 6,036.0
UNITED STATES |  |
Total long-lived assets | 2,356.0 | 2,876.5
UNITED KINGDOM |  |
Total long-lived assets | 606.5 | 2,428.9
Other Countries [Member] |  |
Total long-lived assets | $ 498.4 | $ 730.6

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

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- Details
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Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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