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Note 6 - Impairments (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]
   
201
7
   
201
6
   
201
5
 
Impairment of property carrying values* (1)
(2) (3)
  $
67.3
    $
93.3
    $
30.3
 
Impairment of i
nvestments in other real estate investments (4)
   
-
     
-
     
5.3
 
Impairment of m
arketable securities and other investments (5)
   
-
     
-
     
9.8
 
Total Impairment charges included in operating expenses
   
67.3
     
93.3
     
45.4
 
Impairment of property carrying values in
cluded in discontinued operations
   
-
     
-
     
0.1
 
Total gross impairment charges
   
67.3
     
93.3
     
45.5
 
Noncontrolling interests
   
-
     
(0.4
)    
(5.6
)
Income tax benefit
   
-
     
(21.1
)    
(9.0
)
Total net impairment charges
  $
67.3
    $
71.8
    $
30.9