Real Estate Facilities (Narrative) (Details) ft² in Millions, $ in Millions	6 Months Ended
Jun. 30, 2026 USD ($) ft² storage_facility
Schedule Of Real Estate Facilities [Line Items]
Aggregate costs to develop and expand	$ 57.3
Net rentable area developed or expanded \| ft²	0.4
Acquisition of Self-Storage Facilities Other Investments
Schedule Of Real Estate Facilities [Line Items]
Number of operating self-storage facilities acquired \| storage_facility	23
Net rentable area acquired (in Sq.ft) \| ft²	1.7
Total cost of acquisition	$ 243.2
Payments to acquire intangible assets	$ 11.1

Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
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-Name Accounting Standards Codification
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
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-Name Accounting Standards Codification
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 30
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147480027/805-50-30-2

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