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Note 13 - Mortgages and Construction Loan Payable - Mortgages Payable (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Balance, Net $ 4,381.5 $ 4,596.1
Weighted Average [Member]    
Interest Rate [1] 3.48% 3.70%
Mortgages [Member]    
Total $ 481.8 $ 867.1
Interest Rate [2] 4.89%  
Fair value debt adjustments, net $ 13.1 19.3
Deferred financing costs, net (2.5) (3.6)
Balance, Net $ 492.4 $ 882.8
Mortgages [Member] | Minimum [Member]    
Interest Rate 3.23% 2.60%
Mortgages [Member] | Maximum [Member]    
Interest Rate 9.75% 9.75%
Mortgages [Member] | Weighted Average [Member]    
Interest Rate [2]   4.57%
Construction Loans [Member]    
Total $ 51.0
Interest Rate 4.23%  
Balance, Net $ 51.0  
[1] Weighted-average interest rate
[2] Weighted-average interest rate