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Fair Value of Financial Assets and Liabilities (Details) (USD $) In Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Financial Assets [Abstract]
Notes receivable issued in connection with Crest property sales	$ 22.0	$ 22.1
Financial Liabilities [Abstract]
Notes payable	1,750.0	1,600.0
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Assets [Abstract]
Notes receivable issued in connection with Crest property sales	23.0	23.2
Fair Value Estimate Methodology For Notes Receivable Issued In Connection With Crest Property Sales	Based upon the current 5-year or 7-year Treasury yield curve, plus an applicable credit-adjusted spread.	Based upon current 5-year or 7-year Treasury yield curve, plus an applicable credit-adjusted spread.
Financial Liabilities [Abstract]
Notes payable	$ 1,877.6	$ 1,707.1
Fair Value Estimate Methodology For Notes Payable	based upon indicative market prices and recent trading activity of our notes payable.	based upon indicative market prices and recent trading activity of our notes payable.

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date.

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