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Basis of Presentation and Summary of Significant Accounting Policies (Foreign Currency Exchange Translation) (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Trading Activity, Gains and Losses, Net [Line Items]
Exchange rate translation (percentage)					1.226
Shurgard
Trading Activity, Gains and Losses, Net [Line Items]
Exchange rate translation (percentage)	1.159		1.159
Weighted Average
Trading Activity, Gains and Losses, Net [Line Items]
Exchange rate	1.179	1.168	1.196	1.124

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Foreign exchange rate.

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- Definition

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32618-110901

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