Note 11 - Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2024 |
Sep. 30, 2023 |
Sep. 30, 2024 |
Sep. 30, 2023 |
|
| Income from continuing operations | $ 220.0 | $ 187.4 | $ 747.2 | $ 586.1 |
| Less: Net income attributable to noncontrolling interests | 0.1 | 0.0 | 0.6 | 0.0 |
| Loss from discontinued operations, net of tax | 0.0 | 0.0 | 0.0 | (145.5) |
| Net income attributable to Verisk | $ 220.1 | $ 187.4 | $ 747.8 | $ 440.6 |
| Weighted average number of common shares used in basic EPS (in shares) | 141,778,551 | 145,011,020 | 142,594,074 | 147,292,590 |
| Potential common shares issuable from stock options and stock awards (in shares) | 732,925 | 731,499 | 665,337 | 691,396 |
| Weighted average number of common shares and dilutive potential common shares used in diluted EPS (in shares) | 142,511,476 | 145,742,519 | 143,259,411 | 147,983,986 |
| X | ||||||||||
- Definition Amount after tax of income (loss) from continuing operations attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount after tax of income (loss) from continuing operations attributable to the noncontrolling interest. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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