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.