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Note 16 - Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income from continuing operations $ 768.4 $ 1,042.1 $ 607.1
Less: Net loss (income) attributable to noncontrolling interests 0.2 (0.4) (0.1)
Income from discontinued operations, net of tax (154.0) (87.8) 59.2
Net income attributable to Verisk $ 614.6 $ 953.9 $ 666.2
Weighted average number of common shares used in basic EPS (in shares) 146,623,989 157,905,718 161,841,441
Potential common shares issuable from stock options and stock-based awards (in shares) 712,170 1,023,224 1,497,468
Weighted average number of common shares and dilutive potential common shares used in diluted EPS (in shares) 147,336,159 158,928,942 163,338,909