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Note 10 - Debt (Details Textual) - USD ($)		3 Months Ended		9 Months Ended
Note 10 - Debt (Details Textual) - USD ($)	Jun. 07, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jun. 05, 2024	Dec. 31, 2023
Gain (Loss) on Extinguishment of Debt		$ 0	$ 0	$ 3,600,000	$ 0
Payment for Debt Extinguishment or Debt Prepayment Cost		(0)	$ (0)	396,400,000	$ (0)
Letters of Credit Outstanding, Amount		4,500,000		4,500,000			$ 4,600,000
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		1,000,000,000		1,000,000,000
Line of Credit Facility, Remaining Borrowing Capacity		$ 995,500,000		$ 995,500,000			$ 995,400,000
The 2034 Senior Notes [Member]
Debt Instrument, Face Amount						$ 600,000,000
Debt Instrument, Interest Rate, Stated Percentage		5.25%		5.25%		5.25%
Debt Instrument, Unamortized Discount		$ 14,600,000		$ 14,600,000		$ 9,800,000
Debt Issuance Costs, Net						$ 5,600,000
The 4.000% Senior Note [Member]
Long-Term Debt, Gross	$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.00%	4.00%		4.00%			4.00%
Debt Instrument, Unamortized Discount	$ 5,200,000						$ 1,800,000
Debt Instrument, Repurchase Amount	$ 400,000,000
Debt Instrument, Redemption Price, Percentage	44.40%
Debt Instrument, Repurchased Price Per One Thousand Face Amount	$ 987.09
Gain (Loss) on Extinguishment of Debt	3,600,000
Payment for Debt Extinguishment or Debt Prepayment Cost	$ 1,600,000
Senior Notes [Member]
Long-Term Debt, Gross		$ 3,050,000,000		$ 3,050,000,000			$ 2,850,000,000