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Note 12 - Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2020
Cost	$ 2,355.1	$ 2,345.1
Accumulated amortization	(1,129.2)	(960.3)
Net	$ 1,225.9	$ 1,384.8
Technology-Based Intangible Assets [Member]
Weighted average useful life (Year)	7 years	7 years
Cost	$ 576.4		$ 559.6
Accumulated amortization	(403.3)	$ (349.5)
Net	$ 173.1	$ 210.1
Marketing-Related Intangible Assets [Member]
Weighted average useful life (Year)	15 years	16 years
Cost	$ 274.1	$ 275.2
Accumulated amortization	(129.6)	(113.4)
Net	$ 144.5	$ 161.8
Contract-Based Intangible Assets [Member]
Weighted average useful life (Year)	6 years	6 years
Cost	$ 5.0	$ 5.0
Accumulated amortization	(5.0)	(5.0)
Net	$ 0.0	$ 0.0
Customer-Related Intangible Assets [Member]
Weighted average useful life (Year)	13 years	13 years
Cost	$ 1,015.4	$ 1,004.3
Accumulated amortization	(426.5)	(354.2)
Net	$ 588.9	$ 650.1
Database [Member]
Weighted average useful life (Year)	18 years	19 years
Cost	$ 484.2	$ 501.0
Accumulated amortization	(164.8)	(138.2)
Net	$ 319.4	$ 362.8

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

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-Topic 350
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-Section 50
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