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Investments in Unconsolidated Real Estate Entities (Investment In Shurgard) (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($) shares	Sep. 30, 2021 USD ($) € / shares shares	Sep. 30, 2020 USD ($)	Sep. 30, 2020 € / shares	Sep. 30, 2021 € / shares	Dec. 31, 2020 USD ($) shares
Schedule of Equity Method Investments [Line Items]
Exchange rate translation (percentage)						1.226
Shurgard
Schedule of Equity Method Investments [Line Items]
Shares owned (in shares) | shares	31,268,459	31,268,459				31,268,459
Ownership interest (percentage)	35.00%	35.00%				35.00%
Closing price per share (in Euros per share) | € / shares					€ 47.35
Exchange rate translation (percentage)	1.159	1.159
Market value	$ 1,700.0	$ 1,700.0
intra-entity profits eliminated	21.5		$ 17.0
Common stock dividends paid per share (in Euros per share) | € / shares		$ 0.57		€ 0.50
Basis differential	75.8	$ 75.8				$ 83.1
Amortization of basis differential	7.3		9.5
Change in investment from foreign currency exchange rates	(9.6)		2.5
Trademark License | Shurgard
Schedule of Equity Method Investments [Line Items]
intra-entity profits eliminated	$ 0.9		$ 0.8

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