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Note 7 - Dispositions (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 08, 2022
Mar. 11, 2022
Sep. 30, 2022
Mar. 31, 2022
Sep. 30, 2022
Disposal Group, Including Discontinued Operation, Consideration $ 629.4        
Other Operating Income (Expense) [Member]          
Impairment of Long-Lived Assets to be Disposed of       $ 73.7  
Environmental Health and Safety Business [Member] | Discontinued Operations, Disposed of by Sale [Member]          
Disposal Group, Including Discontinued Operation, Consideration 124.2 $ 575.0      
Environmental Health and Safety Business [Member] | Discontinued Operations, Disposed of by Sale [Member] | Other Operating Income (Expense) [Member]          
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax   $ 450.8      
Verisk Financial Services [Member]          
Disposal Group, Including Discontinued Operation, Consideration 505.2        
Verisk Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member] | Other Operating Income (Expense) [Member]          
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax (15.6)        
Verisk Financial Services [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]          
Disposal Group, Including Discontinued Operation, Consideration 498.3        
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax     $ (7.8)    
Impairment of Long-Lived Assets to be Disposed of $ 73.7        
Disposal Group, Including Discontinued Operation, Revenue         $ 37.6