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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Millions | Share-Based Payment Arrangement, Option [Member] Common Stock [Member] | Share-Based Payment Arrangement, Option [Member] Additional Paid-in Capital [Member] | Share-Based Payment Arrangement, Option [Member] Treasury Stock, Common [Member] | Share-Based Payment Arrangement, Option [Member] Retained Earnings [Member] | Share-Based Payment Arrangement, Option [Member] AOCI Attributable to Parent [Member] | Share-Based Payment Arrangement, Option [Member] Parent [Member] | Share-Based Payment Arrangement, Option [Member] Noncontrolling Interest [Member] | Share-Based Payment Arrangement, Option [Member] | Restricted Stock [Member] Common Stock [Member] | Restricted Stock [Member] Additional Paid-in Capital [Member] | Restricted Stock [Member] Treasury Stock, Common [Member] | Restricted Stock [Member] Retained Earnings [Member] | Restricted Stock [Member] AOCI Attributable to Parent [Member] | Restricted Stock [Member] Parent [Member] | Restricted Stock [Member] Noncontrolling Interest [Member] | Restricted Stock [Member] | Performance Shares [Member] Common Stock [Member] | Performance Shares [Member] Additional Paid-in Capital [Member] | Performance Shares [Member] Treasury Stock, Common [Member] | Performance Shares [Member] Retained Earnings [Member] | Performance Shares [Member] AOCI Attributable to Parent [Member] | Performance Shares [Member] Parent [Member] | Performance Shares [Member] Noncontrolling Interest [Member] | Performance Shares [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock, Common [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Parent [Member] | Noncontrolling Interest [Member] | Total
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Balance (in shares) at Dec. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 544,003,038 |  |  |  |  |  |  |
Balance at Dec. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1 | $ 2,608.7 | $ (4,638.1) | $ 5,240.4 | $ (394.6) | $ 2,816.5 | $ 26.0 | $ 2,842.5
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 | 703.4 | 0.0 | 703.4 | 0.2 | 703.6
Other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 | 0.0 | (288.2) | (288.2) | (1.5) | (289.7)
Investment in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | (1.0) | 0.0 | 0.0 | (0.6) | (1.6) | (6.6) | (8.2)
Common stock dividend (1) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 | (98.3) | 0.0 | (98.3) | 0.0 | (98.3)
Stock options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 80.1 | 14.5 | 0.0 | 0.0 | 94.6 | 0.0 | 94.6
RSAs lapsed |  |  |  |  |  |  |  |  |  | $ 0.0 | $ (1.6) | $ 1.6 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 38.9 | 0.0 | 0.0 | 0.0 | 38.9 | 0.0 | 38.9
Net share settlement from RSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | (20.0) | 0.0 | 0.0 | 0.0 | (20.0) | 0.0 | (20.0)
Other stock issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 2.6 | 0.3 | 0.0 | 0.0 | 2.9 | 0.0 | 2.9
Treasury stock acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 | 0.0 | (896.3) | 0.0 | 0.0 | (896.3) | 0.0 | (896.3)
PSUs lapsed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 | $ (0.6) | $ 0.6 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |  |  |  |  |  |  |  |
RSAs lapsed |  |  |  |  |  |  |  |  |  | 0.0 | 1.6 | (1.6) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance (in shares) at Jun. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 544,003,038 |  |  |  |  |  |  |
Balance at Jun. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1 | 2,707.1 | (5,517.4) | 5,845.5 | (683.4) | 2,351.9 | 18.1 | 2,370.0
Balance (in shares) at Mar. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 544,003,038 |  |  |  |  |  |  |
Balance at Mar. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1 | 2,632.5 | (5,205.9) | 5,696.9 | (465.0) | 2,658.6 | 17.3 | 2,675.9
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 | 197.7 | 0.0 | 197.7 | 0.1 | 197.8
Other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 | 0.0 | (217.8) | (217.8) | (0.9) | (218.7)
Investment in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | (1.0) | 0.0 | 0.0 | (0.6) | (1.6) | 1.6 | 0.0
Common stock dividend (1) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 | (49.1) | 0.0 | (49.1) | 0.0 | (49.1)
Stock options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 65.7 | 12.3 | 0.0 | 0.0 | 78.0 | 0.0 | 78.0
RSAs lapsed |  |  |  |  |  |  |  |  |  | (0.0) | 1.0 | (1.0) | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 18.4 | 0.0 | 0.0 | 0.0 | 18.4 | 0.0 | 18.4
Net share settlement from RSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | (8.7) | 0.0 | 0.0 | 0.0 | (8.7) | 0.0 | (8.7)
Other stock issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 1.2 | 0.2 | 0.0 | 0.0 | 1.4 | 0.0 | 1.4
Treasury stock acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 | 0.0 | (325.0) | 0.0 | 0.0 | (325.0) | 0.0 | (325.0)
PSUs lapsed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |  |  |  |  |
RSAs lapsed |  |  |  |  |  |  |  |  |  | 0.0 | (1.0) | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance (in shares) at Jun. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 544,003,038 |  |  |  |  |  |  |
Balance at Jun. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1 | 2,707.1 | (5,517.4) | 5,845.5 | (683.4) | 2,351.9 | 18.1 | 2,370.0
Balance (in shares) at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 544,003,038 |  |  |  |  |  |  |
Balance at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1 | 2,720.8 | (6,239.5) | 5,999.1 | (731.2) | 1,749.3 | 18.4 | 1,767.7
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 | 253.2 | 0.0 | 253.2 | 0.0 | 253.2
Other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 | 0.0 | 776.8 | 776.8 | (0.1) | 776.7
Investment in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | (3.9) | 0.0 | 0.0 | 0.1 | (3.8) | (6.5) | (10.3)
Common stock dividend (1) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 | (98.5) | 0.0 | (98.5) | 0.0 | (98.5)
Excise tax associated with share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (18.1) | 0.0 | 0.0 | (18.1) | (18.1)
Stock options exercised |  | $ 0.0 | $ 93.8 | $ 20.4 | $ 0.0 | $ 0.0 | $ 114.2 | $ 0.0 | $ 114.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RSAs lapsed |  |  |  |  |  |  |  |  |  | (0.0) | 1.7 | (1.7) | (0.0) | (0.0) | (0.0) | (0.0) | (0.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 33.9 | 0.0 | 0.0 | 0.0 | 33.9 | 0.0 | 33.9
Net share settlement from RSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | (13.8) | 0.0 | 0.0 | 0.0 | (13.8) | 0.0 | (13.8)
Other stock issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 1.8 | 0.3 | 0.0 | 0.0 | 2.1 | 0.0 | 2.1
Treasury stock acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 37.5 | (2,538.8) | 0.0 | 0.0 | (2,501.3) | 0.0 | (2,501.3)
PSUs lapsed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 | $ (0.4) | $ 0.4 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |  |  |  |  |  |  |  |
RSAs lapsed |  |  |  |  |  |  |  |  |  | 0.0 | (1.7) | 1.7 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchases via accelerated share repurchase program not yet settled |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 | (500.3) | 500.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0
Balance (in shares) at Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 544,003,038 |  |  |  |  |  |  |
Balance at Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1 | 2,367.7 | (8,273.3) | 6,153.8 | 45.7 | 294.0 | 11.8 | 305.8
Balance (in shares) at Mar. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 544,003,038 |  |  |  |  |  |  |
Balance at Mar. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1 | 2,315.5 | (8,283.3) | 6,006.7 | 29.4 | 68.4 | 11.2 | 79.6
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 | 196.9 | 0.0 | 196.9 | (0.1) | 196.8
Other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 | 0.0 | 16.9 | 16.9 | 0.6 | 17.5
Investment in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 | 0.0 | (0.6) | (0.6) | 0.1 | (0.5)
Common stock dividend (1) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 | (49.8) | 0.0 | (49.8) | 0.0 | (49.8)
Excise tax associated with share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 1.0 | 0.0 | 1.0
Stock options exercised |  | $ 0.0 | $ 43.1 | $ 8.6 | $ 0.0 | $ 0.0 | $ 51.7 | $ 0.0 | $ 51.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RSAs lapsed |  |  |  |  |  |  |  |  |  | 0.0 | (0.3) | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 10.0 | 0.0 | 0.0 | 0.0 | 10.0 | 0.0 | 10.0
Net share settlement from RSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | (1.5) | 0.0 | 0.0 | 0.0 | (1.5) | 0.0 | (1.5)
Other stock issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 | 0.9 | 0.1 | 0.0 | 0.0 | 1.0 | 0.0 | 1.0
RSAs lapsed |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.3 | $ (0.3) | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance (in shares) at Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 544,003,038 |  |  |  |  |  |  |
Balance at Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1 | $ 2,367.7 | $ (8,273.3) | $ 6,153.8 | $ 45.7 | $ 294.0 | $ 11.8 | $ 305.8
[1] | Refer to Note 11. Stockholders' Equity for discussion related to quarterly cash dividends declared per share

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Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase or decrease in noncontrolling interest from investment. + References No definition available. + Details
Name: | vrsk_NoncontrollingInterestIncreaseDecreaseFromInvestment
Namespace Prefix: | vrsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of OCI excluding investments in noncontrolling interests, net of the tax. + References No definition available. + Details
Name: | vrsk_OtherComprehensiveIncomeLossExcludingInvestmentInNoncontrollingInterestsNetOfTax
Namespace Prefix: | vrsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The value of performance share units lapsed. + References No definition available. + Details
Name: | vrsk_PerformanceShareUnitsLapsed
Namespace Prefix: | vrsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the value of restricted stock lapsed during the reporting period. + References No definition available. + Details
Name: | vrsk_RestrictedStockLapses
Namespace Prefix: | vrsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of treasury stock shares repurchased not yet settled. + References No definition available. + Details
Name: | vrsk_TreasuryStockSharesRepurchasedNotYetSettled
Namespace Prefix: | vrsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration