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Note 7 - Disposition and Business Held for Sale (Details Textual) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Mar. 11, 2022	Mar. 31, 2022	Dec. 31, 2021
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	$ 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, Held-for-sale, Not Discontinued Operations [Member]
Disposal Group, Including Discontinued Operation, Consideration		498.6
Disposal Group, Including Discontinued Operation, Revenue		34.8
Verisk Financial Services [Member] \| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] \| Other Operating Income (Expense) [Member]
Impairment of Long-Lived Assets to be Disposed of		$ 73.7	$ 134.0