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Note 5 - Dispositions of Real Estate and Assets Held-for-sale (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Disposal Groups, Including Discontinued Operations [Table Text Block]
   
Year Ended
December 31
,
  
   
201
7
    
2016
    
2015
  
Aggregate sales price
   $
352.2
     $
378.7
     $
492.5
  
Gain on sale, net of tax
   $
93.5
     $
86.8
     $
143.6
  
Impairment charges
   $
17.1
     $
37.2
     $
10.2
  
Number of operating properties sold
    
25
      
30
      
89
  
Number of
parcels/out-parcels sold
    
9
      
2
      
8