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Notes Receivable from Asset Sales (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Retail Land Sale Receivables, Weighted Average Interest Rate 2.10% 2.10%
Notes, Loans and Financing Receivable, Net $ 533.5 $ 533.5
Notes, Loans and Financing Receivable, Net, Current 10.0  
Notes, Loans and Financing Receivable, Net, Noncurrent 523.5 533.5
Notes Receivable, Fair Value Disclosure 543.3 548.7
Senior Notes Receivable, due 2012 [Member]
   
Notes, Loans and Financing Receivable, Net 9.9 9.9
Senior Notes 2013 2018 [Member] [Member]
   
Notes, Loans and Financing Receivable, Net 113.6 113.6
Senior Notes 2018 [Member]
   
Notes, Loans and Financing Receivable, Net   410.0
More than One and within Two Years from Balance Sheet Date [Member]
   
Notes, Loans and Financing Receivable, Net 91.4  
More than Two and within Three Years from Balance Sheet Date [Member]
   
Notes, Loans and Financing Receivable, Net 0  
More than Three and within Four Years from Balance Sheet Date [Member]
   
Notes, Loans and Financing Receivable, Net 0  
More than Four and within Five Years from Balance Sheet Date [Member]
   
Notes, Loans and Financing Receivable, Net 0  
More than Five Years from Balance Sheet Date and Thereafter [Member]
   
Notes, Loans and Financing Receivable, Net $ 432.1