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Other Assets (Tables)
6 Months Ended
Jun. 30, 2011
Other Assets [Abstract]  
Items included in other assets
                 
    June 30,     December 31,  
(Dollars in millions)   2011     2010  
 
Prepaid assets
  $ 31.3     $ 27.9  
Straight-line rent receivables
    29.5       27.0  
Above-market intangible assets, net
    13.2       13.4  
Deferred financing costs, net
    10.0       12.0  
Accounts receivable
    6.3       6.1  
Goodwill
    3.5       3.5  
Equity investment in joint venture — cost method
    1.3       1.3  
Customer relationship intangible assets, net
    1.1       1.2  
Notes receivable
    0.3       3.8  
Allowance for uncollectible accounts
    (1.3 )     (1.2 )
Other
    5.4       1.5  
       
 
  $ 100.6     $ 96.5