Note 14 - Mortgages Payable - Mortgages Payable (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Balance, Net		$ 6,781.0	$ 7,027.1
Weighted Average [Member]
Interest Rate	[1]	3.45%	3.35%
Mortgages [Member]
Gross Balance		$ 379.3	$ 439.2
Interest Rate	[1]	4.16%
Fair value debt adjustments, net		$ (0.7)	10.8
Deferred financing costs, net		(1.7)	(1.3)
Balance, Net		$ 376.9	$ 448.7
Mortgages [Member] | Minimum [Member]
Interest Rate		3.23%	3.23%
Mortgages [Member] | Maximum [Member]
Interest Rate		7.23%	7.23%
Mortgages [Member] | Weighted Average [Member]
Interest Rate	[1]		4.12%

[1] Weighted-average interest rate