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Note 5 - Dispositions of Real Estate and Assets Held-for-sale (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Disposal Groups, Including Discontinued Operations [Table Text Block]
   
Year Ended
December 31
,
 
   
201
8
   
201
7
   
2016
 
Aggregate sales price/gross fair value
  $
1,164.3
    $
352.2
    $
378.7
 
Gain on sale of operating properties/change in control of interests
  $
229.8
    $
93.5
    $
92.8
 
Impairment charges
  $
19.7
    $
17.1
    $
37.2
 
Number of operating properties sold/deconsolidated
   
54
     
25
     
30
 
Number of out-parcels sold
   
7
     
9
     
2