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Subsequent Events (Narrative) (Details) - Acquisition Of Self-Storage Facilities Other Investments ft² in Millions, $ in Millions	1 Months Ended	9 Months Ended
	Nov. 01, 2021 USD ($) ft² company state storageFacility tranche	Sep. 30, 2021 USD ($)	Dec. 31, 2021 storageFacility	Nov. 30, 2021 storageFacility
Subsequent Event [Line Items]
Total cost of acquisition		$ 2,800.0
Subsequent Event
Subsequent Event [Line Items]
Number of self-storage facilities acquired or under contract to be acquired | storageFacility	107
Number of states self-storage facilities acquired or under contracts to be acquired | state	16
Net rentable area (in square feet) | ft²	11.8
Total cost of acquisition	$ 2,300.0
Issuance of partnership units	$ 80.0
Number of tranches expected to close | tranche	2
Subsequent Event | Forecast
Subsequent Event [Line Items]
Number of self-storage facilities acquired | storageFacility			49	7
Subsequent Event | All Storage
Subsequent Event [Line Items]
Number of self-storage facilities acquired or under contract to be acquired | company	56
Net rentable area (in square feet) | ft²	7.5
Total cost of acquisition	$ 1,500.0

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477

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