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Segment Information (Narrative) (Details) - country	Sep. 30, 2021	Dec. 31, 2020
PSB
Schedule of Equity Method Investments [Line Items]
Ownership interest (percentage)	42.00%	42.00%
Shurgard
Schedule of Equity Method Investments [Line Items]
Ownership interest (percentage)	35.00%	35.00%
Number of countries in which entity operates	7

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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- Definition

The number of countries in which the entity operates as of balance sheet date.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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