Note 13 - Notes Payable - Debt Issued (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
August 2022 Senior Unsecured Note [Member]
Amount Issued	$ 650.0
Debt Instrument, Interest Rate, Stated Percentage	4.60%
Senior Unsecured Notes 1 [Member]
Debt Instrument, Interest Rate, Stated Percentage	3.50%	[1]
Amount Repaid	$ 299.7	[1]
February 2022 Senior Unsecured Notes [Member]
Amount Issued	$ 600.0
Debt Instrument, Interest Rate, Stated Percentage	3.20%
Senior Unsecured Notes 2 [Member]
Debt Instrument, Interest Rate, Stated Percentage	3.125%	[2]
Amount Repaid	$ 350.0	[2]
September 2021 Senior Unsecured Notes [Member]
Amount Issued	$ 500.0
Debt Instrument, Interest Rate, Stated Percentage	2.25%
Senior Unsecured Notes 3 [Member]
Debt Instrument, Interest Rate, Stated Percentage	3.375%	[2]
Amount Repaid	$ 299.4	[2]
Senior Unsecured Notes 4 [Member]
Debt Instrument, Interest Rate, Stated Percentage	3.40%	[3]
Amount Repaid	$ 500.0	[3]

[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.