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Note 23 - Incentive Plans (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2022 | May 31, 2020
Share-Based Payment Arrangement, Expense |  | $ 26.6 | $ 23.2 | $ 23.7 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | $ 43.1 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 2 years 9 months 18 days |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  | 0 | 0 | 0 |  |
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share) |  | $ 20.41 |  |  |  |
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share) |  | $ 24.12 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  | 2 months 12 days |  |  |  |
Proceeds from Stock Options Exercised |  | $ 4.2 | $ 6.1 | $ 1.0 |  |
Common Stock, Shares, Issued (in shares) |  | 618,483,565 | 616,658,593 |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  | 5.00% |  |  |  |
Defined Contribution Plan, Cost |  | $ 2.6 | $ 2.4 | 2.3 |  |
Employee [Member] |  |  |  |  |  |
Severance Costs |  | $ 1.5 | 14.4 | $ 8.7 |  |
Employee [Member] | Merger Charges [Member] |  |  |  |  |  |
Severance Costs |  |  | $ 13.7 |  |  |
Restricted Stock [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 24.27 | $ 17.81 | $ 18.67 |  |
Dividend, Share-Based Payment Arrangement, Shares |  | $ 2.5 | $ 1.8 | $ 2.2 |  |
Performance Shares [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 31.19 | $ 22.96 | $ 18.02 |  |
Common Stock, Shares, Issued (in shares) |  | 998,238 | 814,160 | 594,900 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate | [1] | 0.00% | 0.00% | 0.00% |  |
The 2020 Equity Participation Plan [Member] |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  |  |  |  | 10,000,000.0
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  | 6,900,000 |
[1] | Total Shareholder Returns, as used in the performance share awards computation, are measured based on cumulative dividend stock prices, as such a zero percent dividend yield is utilized.

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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