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Note 3 - Operating Property Activities (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Disposal Groups, Including Discontinued Operations [Table Text Block]
   
Six
Months Ended
June 30
,
 
   
2018
   
2017
 
Aggregate sales price
  $
833.1
    $
157.3
 
Gain on sale of operating properties/change in control of interests
  $
152.2
    $
21.6
 
Impairment charges
  $
9.9
    $
2.4
 
Number of operating properties sold/deconsolidated
   
35
     
11
 
Number of out-parcels sold
   
2
     
5