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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-Name Statement of Financial Accounting Standard (FAS)

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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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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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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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For the investments in land and buildings held for sale, the accumulated depreciation value of real estate investment property that is classified as held for sale.

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Discontinued Operations (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended		12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended						6 Months Ended		12 Months Ended		6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 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	Dec. 31, 2012 Colorado [Member] property	Jun. 30, 2013 Florida [Member] property	Dec. 31, 2012 Florida [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	Jun. 30, 2013 Nevada [Member] property	Jun. 30, 2013 New Mexico [Member] property	Dec. 31, 2012 North Carolina [Member] property	Dec. 31, 2012 Oklahoma [Member] property	Jun. 30, 2013 Tennessee [Member] property	Dec. 31, 2012 Tennessee [Member] property	Jun. 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	10			27	9	54	52	1	2	2	6	6	1	1	2	1	1	1	3	1	1	1	5	55	2
Number of properties held for sale	1	0
Property held for sale, gross	$ 11.8
Property held for sale, accumulated depreciation	3.1
Ownership percentage in joint ventures		75.00%	47.80%
Gross property included in discontinued operations		126.2
Accumulated depreciation for property included in discontinued operations		$ 50.9
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.