Investments in Unconsolidated Real Estate Entities (Investment In Shurgard) (Narrative) (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2021 € / shares
Schedule of Equity Method Investments [Line Items]
Exchange rate translation (percentage)	1.134	1.226
Shurgard
Schedule of Equity Method Investments [Line Items]
Shares owned (in shares) \| shares	31,268,459	31,268,459
Ownership interest (percentage)	35.00%	35.00%
Closing price per share (in Euros per share) \| € / shares				€ 57.50
Market value	$ 2,000.0
Intra-entity profits eliminated	41.5	$ 34.9	$ 23.1
Basis differential	74.7	83.1
Amortization of basis differential	8.4	5.8	5.5
Trademark License \| Shurgard
Schedule of Equity Method Investments [Line Items]
Intra-entity profits eliminated	$ 1.2	$ 1.1	$ 1.0

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