Note 12 - Notes Payable - Debt Issued (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2023
October 2023 Senior Unsecured Note [Member]
Amount Issued			$ 500.0
Debt Instrument, Interest Rate, Stated Percentage			6.40%
Senior Unsecured Notes 1 [Member]
Debt Instrument, Interest Rate, Stated Percentage	[1]	3.50%
Amount Repaid	[1]	$ 299.7
August 2022 Senior Unsecured Note [Member]
Amount Issued			$ 650.0
Debt Instrument, Interest Rate, Stated Percentage			4.60%
Senior Unsecured Notes 2 [Member]
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.125%
Amount Repaid	[2]	$ 350.0
February 2022 Senior Unsecured Notes [Member]
Amount Issued			$ 600.0
Debt Instrument, Interest Rate, Stated Percentage			3.20%
Senior Unsecured Notes 3 [Member]
Debt Instrument, Interest Rate, Stated Percentage	[2]	3.375%
Amount Repaid	[2]	$ 299.4
Senior Unsecured Notes 4 [Member]
Debt Instrument, Interest Rate, Stated Percentage	[3]	3.40%
Amount Repaid	[3]	$ 500.0

[1] There was no prepayment charge associated with this early repayment.

[2] Includes partial repayments during May and June 2022.

[3] The Company incurred a prepayment charge of $6.5 million and $0.7 million in write-off of deferred financing costs resulting from this early repayment, which are included in Early extinguishment of debt charges on the Company's Condensed Consolidated Statements of Income.