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Note 8 - Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Cost	$ 1,993.8	$ 2,355.1
Accumulated amortization	(903.3)	(1,129.2)
Net	$ 1,090.5	$ 1,225.9
Technology-Based Intangible Assets [Member]
Weighted average useful life (Year)	7 years	7 years
Cost	$ 527.1	$ 576.4
Accumulated amortization	(362.4)	(403.3)
Net	$ 164.7	$ 173.1
Marketing-Related Intangible Assets [Member]
Weighted average useful life (Year)	15 years	15 years
Cost	$ 213.2	$ 274.1
Accumulated amortization	(101.9)	(129.6)
Net	$ 111.3	$ 144.5
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	$ 879.1	$ 1,015.4
Accumulated amortization	(297.2)	(426.5)
Net	$ 581.9	$ 588.9
Database [Member]
Weighted average useful life (Year)	18 years	18 years
Cost	$ 369.4	$ 484.2
Accumulated amortization	(136.8)	(164.8)
Net	$ 232.6	$ 319.4

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 https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(16))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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 https://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI https://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 https://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

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