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Note 6 - Revenues - Summary of Change in Contract Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Contract Liabilities | $ 468.2 | $ 443.2
Revenue | (2,998.6) | (2,784.6)
Billings | 3,035.2 | 2,809.6
Contract Liabilities | $ 504.8 | $ 468.2

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of increase (decrease) in obligation to transfer good or service to customer from billings. + References No definition available. + Details
Name: | vrsk_ContractWithCustomerLiabilityBillings
Namespace Prefix: | vrsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of revenue recognized during period including amounts previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.) + References No definition available. + Details
Name: | vrsk_ContractWithCustomerLiabilityRevenueRecognizedDuringPeriod
Namespace Prefix: | vrsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration