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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

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- 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. + Details
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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 + Details
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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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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