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Note 6 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Beginning balance | $ 80.9 | $ 89.1 | $ 78.5
Additions based on tax positions related to the current year | 13.3 | 16.2 | 25.8
Additions/(reductions) based on tax positions taken in prior years | (2.9) |  |
Additions/(reductions) based on tax positions taken in prior years |  | 0.5 | 2.8
Reductions due to settlements | (1.4) | (14.6) | (8.0)
Reductions due to lapse of applicable statute of limitations | (11.9) | (10.3) | (10.0)
Ending balance | $ 78.0 | $ 80.9 | $ 89.1

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-10B + Details
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