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Investment in Unconsolidated Real Estate Entities - Narrative (Details) - VIE, not primary beneficiary - USD ($) $ in Millions	Sep. 30, 2021	Jul. 29, 2021	Dec. 24, 2020	Jun. 05, 2019
Joint Venture Waltham Cross Studios
Schedule of Equity Method Investments
Ownership interest (percent)	35.00%	35.00%
Joint Venture, Bentall Centre
Schedule of Equity Method Investments
Ownership interest (percent)	20.00%			20.00%
Joint Venture, Bentall Centre | Financial guarantee
Schedule of Equity Method Investments
Maximum exposure for guarantee	$ 102.7
Joint Venture Sunset Glenoaks Studios Property
Schedule of Equity Method Investments
Ownership interest (percent)	50.00%		50.00%

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- Definition

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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