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Investments in and Advances to Unconsolidated Affiliates - Fund Investments - Additional Information (Details) $ in Millions	Mar. 31, 2021 property	Jun. 30, 2020 property	May 26, 2020 USD ($) property
Schedule of Equity Method Investments [Line Items]
Number of retail properties	186
Broughton St. Portfolio Savannah, GA
Schedule of Equity Method Investments [Line Items]
Number of retail properties			2
Purchase Price | $			$ 1.3
Consolidated Affiliates | BSP II
Schedule of Equity Method Investments [Line Items]
Number of retail properties		2

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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