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Note 9 - Debt (Details Textual) - USD ($) $ in Millions	Jun. 30, 2025	Apr. 21, 2025	Mar. 11, 2025	Dec. 31, 2024
Letters of Credit Outstanding, Amount	$ 4.6			$ 4.6
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	1,000.0
Line of Credit Facility, Remaining Borrowing Capacity	$ 995.4			$ 995.4
The 5.250% Senior Notes Due in 2035 [Member]
Debt Instrument, Face Amount			$ 700.0
Debt Instrument, Interest Rate, Stated Percentage	5.25%		5.25%
Debt Instrument, Unamortized Discount	$ 7.7		$ 1.7
Debt Issuance Costs, Net			$ 6.2
The 4.000% Senior Notes Due in 2025 [Member]
Debt Instrument, Face Amount		$ 500.0
Debt Instrument, Interest Rate, Stated Percentage	4.00%	4.00%		4.00%
Senior Notes [Member]
Long-Term Debt, Gross	$ 3,250.0			$ 3,050.0