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Note 6 - Impairments (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]
   
201
8
    
201
7
    
201
6
  
Properties marketed for sale (1) (2)
   $
59.5
     $
34.0
     $
28.6
  
Properties disposed
  
19.7
      
17.1
      
37.2
  
Properties held and used (3)
    
-
      
16.2
      
27.5
  
Total gross property impairment charges* (4)
    
79.2
      
67.3
      
93.3
  
Noncontrolling interests
    
-
      
-
      
(0.4
 )
Benefit for income taxes
    
-
      
-
      
(21.1
 )
Total net impairment charges
   $
79.2
     $
67.3
     $
71.8