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

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

-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition

Disclosure of accounting policy for allocating interest on borrowings to operations reported as being discontinued. may also include the amount allocated to and reported in discontinued operations.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section S99

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6361211&loc=d3e7436-122677

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 87-24

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For the disposal group, including a component of the entity (discontinued operation), the accumulated depreciation value of real estate investment property that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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For the disposal group, including a component of the entity (discontinued operation), carrying value of real estate investment property that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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

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Discontinued Operations (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended		12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended						9 Months Ended			12 Months Ended		9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2013 property	Dec. 31, 2012 property	Feb. 29, 2012	Dec. 31, 2012 Shopping Centers [Member] property	Nov. 30, 2012 Industrial Properties [Member] property	Dec. 31, 2012 Industrial Properties [Member] property	May 31, 2012 Wholly-Owned Industrial Properties [Member] property	Dec. 31, 2012 Arizona [Member] property	Sep. 30, 2013 Florida [Member] property	Dec. 31, 2012 Florida [Member] property	Sep. 30, 2013 California [Member] property	Dec. 31, 2012 Colorado [Member] property	Dec. 31, 2012 Georgia [Member] property	Dec. 31, 2012 Illinois [Member] property	Dec. 31, 2012 Kansas [Member] property	Dec. 31, 2012 Louisiana [Member] property	Dec. 31, 2012 Maine [Member] property	Sep. 30, 2013 Nevada [Member] property	Sep. 30, 2013 New Mexico [Member] property	Sep. 30, 2013 North Carolina [Member] property	Dec. 31, 2012 North Carolina [Member] property	Dec. 31, 2012 Oklahoma [Member] property	Sep. 30, 2013 Tennessee [Member] property	Dec. 31, 2012 Tennessee [Member] property	Sep. 30, 2013 Texas [Member] property	Dec. 31, 2012 Texas [Member] property	Dec. 31, 2012 Virginia [Member] property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of operating properties sold	18			27	9	54	52	1	2	6	1	2	6	1	1	2	1	1	2	3	3	1	1	1	8	55	2
Number of properties held for sale	0	0
Ownership percentage in joint ventures		75.00%	47.80%
Gross property included in discontinued operations		$ 207.5
Accumulated depreciation for property included in discontinued operations		$ 72.0
Interest expense allocated to discontinued operations	We do not allocate other consolidated interest to discontinued operations because the interest savings to be realized from the proceeds of the sale of these operations is not material.