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Note 16 - Stockholders' Equity - Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Foreign currency translation adjustment attributable to Verisk, before tax | $ 67.0 | $ (298.9) | $ (45.8)
Foreign currency translation adjustment attributable to Verisk, tax | 0.0 | 0.0 |
Foreign currency translation adjustment attributable to Verisk, after tax | 67.0 | (298.9) | (45.8)
Foreign currency translation adjustment attributable to noncontrolling interests, before tax | 0.6 | (1.4) | (0.5)
Foreign currency translation adjustment attributable to noncontrolling interests, tax | 0.0 | 0.0 | 0.0
Foreign currency translation adjustment attributable to noncontrolling interests, after tax | 0.6 | (1.4) | (0.5)
Cumulative translation adjustment recognized upon deconsolidation of the Energy business, before tax | 700.6 |  |
Cumulative translation adjustment recognized upon deconsolidation of the Energy business, tax | 0.0 |  |
Cumulative translation adjustment recognized upon deconsolidation of the Energy business, after tax | 700.6 |  |
Foreign currency translation adjustment, before tax | 768.2 | (300.3) | (46.3)
Foreign currency translation adjustment, tax | 0.0 | 0.0 | 0.0
Foreign currency translation adjustment, after tax | 768.2 | (300.3) | (46.3)
Total other comprehensive income, before tax | 797.5 | (350.4) | (10.6)
Total other comprehensive income, tax | (7.5) | 12.4 | (8.8)
Total other comprehensive income, after tax | 790.0 | (338.0) | (19.4)
Pension and Postretirement Adjustment [Member] |  |  |
Other comprehensive income (loss), before reclassifications, before tax | 35.1 | (45.7) | 39.8
Other comprehensive income (loss), before reclassifications, tax | (8.9) | 13.5 | (9.8)
Other comprehensive income (loss), before reclassifications, after tax | 26.2 | (32.2) | 30.0
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive income (losses), before tax | (5.8) | (4.4) | (4.1)
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive income (losses), tax | 1.4 | (1.1) | 1.0
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive income (losses), after tax | (4.4) | (5.5) | (3.1)
Other comprehensive income (loss), before tax | 29.3 | (50.1) | 35.7
Other comprehensive income (loss), tax | (7.5) | 12.4 | (8.8)
Other comprehensive income (loss), after tax | $ 21.8 | $ (37.7) | $ 26.9

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