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Noncontrolling Interests (Narrative) (Details) $ in Millions		3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) shares	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)
Acquisition of Self-Storage Facilities Other Investments
Noncontrolling Interest [Line Items]
Issuance of partnership units | $			$ 19.9	$ 68.2
Acquisition of Self Storage Facilities to Date
Noncontrolling Interest [Line Items]
Issuance of partnership units | $	$ 83.8	$ 83.8
Noncontrolling Interests
Noncontrolling Interest [Line Items]
Convertible partnership units (in shares)			499,966
Partnership units conversion ratio			1
Noncontrolling Interests | Acquisition of Self-Storage Facilities Other Investments
Noncontrolling Interest [Line Items]
Convertible partnership units (in shares)			54,137
Noncontrolling Interests | Acquisition of Self Storage Facilities to Date
Noncontrolling Interest [Line Items]
Convertible partnership units (in shares)	254,833

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Amount of acquirer's equity interest issued and issuable as part of consideration transferred in asset acquisition.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 30
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126928898&loc=d3e9215-128498

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 30
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=126928898&loc=d3e9212-128498

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 25
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=127000608&loc=d3e9135-128495

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