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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, 2021 | Dec. 31, 2020 | Sep. 30, 2020
Cost | $ 2,349.5 | $ 2,345.1 |
Accumulated amortization | (1,084.2) | (960.3) |
Net | $ 1,265.3 | $ 1,384.8 |
Technology [Member] |  |  |
Weighted average useful life (Year) | 7 years | 7 years |
Cost | $ 561.3 |  | $ 559.6
Accumulated amortization | (389.0) | $ (349.5) |
Net | $ 172.3 | $ 210.1 |
Marketing [Member] |  |  |
Weighted average useful life (Year) | 15 years | 16 years |
Cost | $ 273.6 | $ 275.2 |
Accumulated amortization | (125.6) | (113.4) |
Net | $ 148.0 | $ 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 | $ 1,013.3 | $ 1,004.3 |
Accumulated amortization | (407.5) | (354.2) |
Net | $ 605.8 | $ 650.1 |
Database [Member] |  |  |
Weighted average useful life (Year) | 18 years | 19 years |
Cost | $ 496.3 | $ 501.0 |
Accumulated amortization | (157.1) | (138.2) |
Net | $ 339.2 | $ 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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