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Note 19 - Segment Reporting - Long-lived Assets By Country (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Total long-lived assets | $ 6,767.6 | $ 6,310.3
UNITED STATES |  |
Total long-lived assets | 3,525.0 | 3,162.5
UNITED KINGDOM |  |
Total long-lived assets | 2,775.8 | 2,685.3
Other Countries [Member] |  |
Total long-lived assets | $ 466.8 | $ 462.5

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 + Details
Name: | us-gaap_NoncurrentAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | srt_StatementGeographicalAxis=country_GB
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: |