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Note 22 - Incentive Plans (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | May 31, 2020
Share-Based Payment Arrangement, Expense |  | $ 33.1 | $ 26.6 | $ 23.2 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 51.5 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 2 years 8 months 12 days |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  | 0 | 0 | 0 |
Proceeds from Stock Options Exercised |  | $ 3.7 | $ 4.2 | $ 6.1 |
Common Stock, Shares, Issued (in shares) |  | 619,871,237 | 618,483,565 |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  | 5.00% |  |  |
Defined Contribution Plan, Cost |  | $ 2.7 | $ 2.6 | 2.4 |
Defined Contribution Plan, Employer Discretionary Contribution Amount |  | 3.9 |  |  |
Merger Charges [Member] |  |  |  |  |
Severance Costs |  |  |  | 13.7 |
Employee [Member] |  |  |  |  |
Severance Costs |  | $ 0.4 | $ 1.5 | $ 14.4 |
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) |  | $ 21.3 | $ 24.27 | $ 17.81 |
Dividend, Share-Based Payment Arrangement, Shares |  | $ 3.1 | $ 2.5 | $ 1.8 |
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) |  | $ 42.61 | $ 31.19 | $ 22.96 |
Common Stock, Shares, Issued (in shares) |  | 970,231 | 998,238 | 814,160 |
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
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  | 4,900,000 |  |  |
[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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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