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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, 2020 | Dec. 31, 2019
Cost | $ 2,209.6 | $ 2,175.3
Accumulated amortization | (893.3) | (776.4)
Net | $ 1,316.3 | $ 1,398.9
Technology [Member] |  |
Weighted average useful life (Year) | 7 years | 7 years
Cost | $ 519.8 | $ 519.2
Accumulated amortization | (330.2) | (291.9)
Net | $ 189.6 | $ 227.3
Marketing [Member] |  |
Weighted average useful life (Year) | 16 years | 16 years
Cost | $ 261.6 | $ 265.3
Accumulated amortization | (105.4) | (94.3)
Net | $ 156.2 | $ 171.0
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 | $ 947.8 | $ 901.2
Accumulated amortization | (328.2) | (278.0)
Net | $ 619.6 | $ 623.2
Database [Member] |  |
Weighted average useful life (Year) | 19 years | 19 years
Cost | $ 475.4 | $ 484.6
Accumulated amortization | (124.5) | (107.2)
Net | $ 350.9 | $ 377.4

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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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