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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) multi-familyApartmentCommunity	Dec. 31, 2021 USD ($)
Variable Interest Entity [Line Items]
Principal balance	$ 14.7
VIE, Primary Beneficiary | Consolidated Real Estate
Variable Interest Entity [Line Items]
Number of properties purchased | multi-familyApartmentCommunity	2
VIE, Primary Beneficiary | Consolidated SLST
Variable Interest Entity [Line Items]
Investment in Consolidated SLST limited to securities owned, net carrying value	$ 198.8	$ 230.3

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- Definition

Number Of Properties Purchased

+ References

No definition available.

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column B))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010

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- Definition

Amount of maximum exposure to loss from involvement with consolidated variable interest entity (VIE).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=123419778&loc=SL6759159-111685

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- Details

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