Investments in Unconsolidated Real Estate Entities (Investment in PSB) (Narrative) (Details) - PSB - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Common stock owned of PSB (in shares)	7,158,354	7,158,354
Limited partnership units in PSB (in shares)	7,305,355	7,305,355
Ownership interest (percentage)	41.00%	42.00%
Limited partnership units option to convert to common stock, conversion basis (in shares)	1
Closing price per share (in USD per share)	$ 184.17
Market value	$ 2,700.0
Cash distribution received	$ 127.3	$ 60.7	$ 60.7

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Limited partnership units in PS Business Parks owned by Public Storage.

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

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Balance held at close of period in number of shares.

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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.

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