Subsequent Events (Narrative) (Details) - Subsequent Event [Member] $ in Millions	1 Months Ended
Aug. 05, 2020 USD ($) ft² item
Subsequent Event [Line Items]
Number of self-storage facilities acquired or under contract to be acquired \| item	5
Net rentable square feet \| ft²	268,000
Total cost of acquisition \| $	$ 33.3

Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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