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Note 2 - Impairments (Tables)
12 Months Ended
Dec. 31, 2012
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]
   
2012
   
2011
   
2010
 
Impairment of property carrying values (including amounts within discontinued operations)
  $ 56.9     $ 22.8     $ 8.7  
Real estate under development
    -       -       11.7  
Investments in other real estate investments
    2.7       3.3       13.4  
Marketable securities and other investments
    -       1.6       5.3  
Investments in real estate joint ventures
    -       5.1       -  
Total gross impairment charges
    59.6       32.8       39.1  
Noncontrolling interests
    (0.4 )     0.7       (0.1 )
Income tax benefit
    (10.6 )     (4.5 )     (7.6 )
Total net impairment charges
  $ 48.6     $ 29.0     $ 31.4