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Note 11 - Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net income attributable to Verisk	$ 168.6	$ 171.7
Weighted average number of common shares used in basic EPS (in shares)	162,641,819	162,894,306
Potential common shares issuable from stock options and stock awards (in shares)	1,794,898	2,829,814
Weighted average number of common shares and dilutive potential common shares used in diluted EPS (in shares)	164,436,717	165,724,120

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