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Note 16 - Stockholders' Equity - Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Foreign currency translation adjustment attributable to Verisk, before tax $ (45.8)    
Foreign currency translation adjustment attributable to Verisk, tax 0.0    
Foreign currency translation adjustment attributable to Verisk, after tax (45.8)    
Foreign currency translation adjustment attributable to noncontrolling interests, before tax (0.5)    
Foreign currency translation adjustment attributable to noncontrolling interests, tax 0.0    
Foreign currency translation adjustment attributable to noncontrolling interests, after tax (0.5)    
Foreign currency translation adjustment, before tax (46.3) $ 107.9 $ 88.4
Foreign currency translation adjustment, tax 0.0 0.0 0.0
Foreign currency translation adjustment, after tax (46.3) 107.9 88.4
Total other comprehensive income, before tax (10.6) 112.3 110.2
Total other comprehensive income, tax (8.8) (1.1) (5.2)
Other comprehensive income (19.4) 111.2 105.0
Pension and Postretirement Adjustment [Member]      
Other comprehensive income (loss), before reclassifications, before tax 39.8 11.1 26.7
Other comprehensive income (loss), before reclassifications, tax (9.8) (2.9) (6.4)
Other comprehensive income (loss), before reclassifications, after tax 30.0 8.2 20.3
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive income (losses), before tax [1] (4.1) (6.7) (4.9)
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive income (loss), tax [1] 1.0 1.8 1.2
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive income (losses), after tax [1] (3.1) (4.9) (3.7)
Other comprehensive income (loss), before tax 35.7 4.4 21.8
Other comprehensive income (loss), tax (8.8) (1.1) (5.2)
Other comprehensive income (loss), after tax $ 26.9 $ 3.3 $ 16.6
[1] These accumulated other comprehensive loss components, before tax, are included under "Cost of revenues" and "Selling, general and administrative" in our accompanying consolidated statements of operations. These components are also included in the computation of net periodic (benefit) cost (See Note 18. Pension and Postretirement Benefits for additional details).