The amount of acquisition cost of a business combination allocated to liabilities assumed.

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

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 98-1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 37

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Subsequent Events (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012 RioCan Canda [Member] sqft	Nov. 02, 2012 RioCan Canda [Member] Business Acquisition Subsequent Event [Member] outletcenters	Nov. 02, 2012 Les Factoreries St. Sauveur Property [Member] Business Acquisition Subsequent Event [Member] sqft	Nov. 02, 2012 Bromont Outlet Mall Property [Member] Business Acquisition Subsequent Event [Member] sqft
Subsequent Event [Line Items]
Number of Outlet Centers Acquired		2
Business Acquisition, Cost of Acquired Entity, Purchase Price		$ 94.8
Square Footage of Real Estate Property	155,522		116,000	162,000
Estimated Square Feet of Expansion			131,000	251,000
Business Acquisition, Purchase Price Allocation, Liabilities Assumed		$ 18.7
Business Acquisition, Debt Assumed, Stated Interest Rate		5.70%