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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

X

- Definition

Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

+ References

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-Publisher FASB
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+ References

No definition available.

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+ References

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