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Note 21 - Incentive Plans (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 31, 2020
Share-based Payment Arrangement, Expense |  | $ 23.7 | $ 20.2 | $ 18.2 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | $ 34.4 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 2 years 10 months 24 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) |  | $ 15.09 |  |  |
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) |  | 1 year 4 months 24 days |  |  |
Proceeds from Stock Options Exercised |  | $ 1.0 | $ 3.9 | $ 0.6 |
Common Stock, Shares, Issued, Total (in shares) |  | 432,518,743 | 431,814,951 |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  | 5.00% |  |  |
Defined Contribution Plan, Cost |  | $ 2.3 | $ 2.2 | 2.2 |
Employee [Member] |  |  |  |  |
Severance Costs |  | $ 8.7 | $ 2.6 | $ 3.8 |
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) |  | $ 18.67 | $ 18.03 | $ 14.72 |
Dividend, Share-based Payment Arrangement, Shares |  | $ 2.2 | $ 3.0 | $ 2.8 |
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) |  | $ 18.02 | $ 22.00 | $ 15.40 |
Common Stock, Shares, Issued, Total (in shares) |  | 594,900 | 104,551 | 0 |
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) |  | 9,980,000 |  |  |
[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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