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Fair Value of Financial Assets and Liabilities (Tables)
6 Months Ended
Jun. 30, 2011
Fair Value of Financial Assets and Liabilities [Abstract]  
Schedule of Fair Value by Balance Sheet Groupings
 

   
Carrying value per
  
Estimated
 
At June 30, 2011
 
balance sheet
  
fair value
 
Notes receivable issued in connection with Crest property sales
 $22.0  $23.0 
Notes payable
 $1,750.0  $1,877.6 

   
Carrying value per
  
Estimated
 
At December 31, 2010
 
balance sheet
  
fair value
 
Notes receivable issued in connection with Crest property sales
 $22.1  $23.2 
Notes payable
 $1,600.0  $1,707.1