The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

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The gains (losses) included in earnings resulting from the sale or disposal of tangible assets. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

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-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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-Publisher FASB

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Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(f))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Number of acquisitions of operating properties.

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The number of real estate properties, buildings or undeveloped land parcels held for sale in the period.

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Gross purchase price from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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Gross cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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The number of real estate properties, buildings or undeveloped land parcels sold during the period.

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Property (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended			9 Months Ended	12 Months Ended	9 Months Ended
	Sep. 30, 2012	Feb. 29, 2012	Dec. 31, 2011	Sep. 30, 2012 Shopping Center [Member] property	Dec. 31, 2011 Shopping Center [Member]	Sep. 30, 2012 Industrial Properties [Member] property	Aug. 06, 2012 Tenancy In Common [Member]
Real Estate Investment Property [Line Items]
Number of operating properties acquired				4
Acquisition of property	$ 232.3
Number of operating properties sold				21		53
Ownership percentage in joint ventures	75.00%	47.80%					79.60%
Proceeds from sale and disposition of property	509.8
Gain on sale of properties	50.5
Number of properties held for sale				6	7
Property classified as held for sale, gross	$ 94.5		$ 94.8