Investments in Unconsolidated Real Estate Entities (Investment in PSB) (Narrative) (Details) - PSB - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
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)	42.00%		42.00%
Limited partnership units option to convert to common stock, conversion basis (in shares)	1
Closing price per share (in USD per share)	$ 156.74
Market value	$ 2,300.0
Cash distribution received	45.6	$ 45.6
Basis differential	2.8		$ 3.4
Amortization of basis differential	$ 0.6	$ 0.6

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Closing Share Price

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

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Limited partnership units option to convert to common stock, conversion basis.

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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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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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This item represents the aggregate value of each identified investment accounted for under the equity method of accounting based on the quoted market price for those investments in common stock for which a quoted market price is available.

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Balance held at close of period in number of shares.

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