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Note 8 - Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Cost	$ 2,363.8		$ 2,345.1
Accumulated amortization	(1,008.1)		(960.3)
Net	$ 1,355.7		1,384.8
Technology [Member]
Weighted average useful life (Year)	7 years	7 years
Cost	$ 563.8		559.6
Accumulated amortization	(364.9)		(349.5)
Net	$ 198.9		210.1
Marketing [Member]
Weighted average useful life (Year)	15 years	16 years
Cost	$ 277.5		275.2
Accumulated amortization	(118.3)		(113.4)
Net	$ 159.2		161.8
Contract-based [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 [Member]
Weighted average useful life (Year)	13 years	13 years
Cost	$ 1,013.6		1,004.3
Accumulated amortization	(373.9)		(354.2)
Net	$ 639.7		650.1
Database [Member]
Weighted average useful life (Year)	18 years	19 years
Cost	$ 503.9		501.0
Accumulated amortization	(146.0)		(138.2)
Net	$ 357.9		$ 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

No definition available.

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X

- 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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-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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