Shareholders' Equity of the Company Common Share Offering (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Sep. 30, 2011 Units
Entity Information [Line Items]
Equity Issuance, Date	Jul. 06, 2011
Stock Issued During Period, Shares, New Issues	4.6
Stock Issued During Period Per Share Amount	$ 25.662
Proceeds from Issuance of Common Stock	$ 117.5
Number of Common General Partnership Units Received in Exchange for Contributed Net Proceeds of Share Offering	13,000
Number of Common Limited Partnership Units Received in Exchange for Contributed Net Proceeds of Share Offering	1,137,000

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Number of Common Limited Partnership Units Received in Exchange for Contributed Net Proceeds of Share Offering

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The cash inflow from the additional capital contribution to the entity.

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