Acquisition of Rental Property Acquistion of Rental Property, Subsequent Event (Details) (USD $) In Millions	3 Months Ended
	Sep. 30, 2011
Subsequent Event [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid	$ 134.0
Business Combination [Member]
Subsequent Event [Line Items]
Business Acquisition, Effective Date of Acquisition	November 1, 2011
Business Acquisition, Estimated Purchase Price	15.90
Business Acquisition, Cost of Acquired Entity, Cash Paid	5.9
Business Acquisition, Purchase Price Allocation, Liabilities Assumed	$ 10.0