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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2011
Fair Value of Financial Instruments [Abstract]  
Fair value and carrying values for notes and bonds payable, mortgage notes receivable and notes receivable
                                 
    June 30, 2011     December 31, 2010  
    Carrying     Fair     Carrying     Fair  
(Dollars in millions)   value     value     value     value  
 
Notes and bonds payable
  $ 1,251.6     $ 1,323.0     $ 1,407.9     $ 1,460.2  
Mortgage notes receivable
  $ 122.6     $ 117.6     $ 36.6     $ 35.9  
Notes receivable, net of allowances
  $ 0.3     $ 0.3     $ 3.8     $ 3.8