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Fair Value of Financial Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified					6 Months Ended
	Jun. 30, 2012 Carrying value per balance sheet	Dec. 31, 2011 Carrying value per balance sheet	Jun. 30, 2012 Estimated fair value	Dec. 31, 2011 Estimated fair value	Jun. 30, 2012 Estimated fair value Low end of the range	Jun. 30, 2012 Estimated fair value High end of the range
Fair value of financial assets and liabilities
Notes receivable issued in connection with property sales	$ 19.0	$ 19.0	$ 20.2	$ 19.6
Notes receivable acquired in connection with an acquisition	8.8	8.8	8.8	8.8
Mortgages payable assumed in connection with acquisitions	56.7	67.8	57.4	68.2
Notes payable	$ 1,750.0	$ 1,750.0	$ 1,972.2	$ 1,901.9
Length of Treasury yield curve used to calculate interest rate					5 years	7 years

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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