The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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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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- Definition

The number of real estate properties owned as of the balance sheet date.

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- Definition

Cash received for the sale of real estate that is not part of an investing activity during the current period.

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Held for Sale/Disposed Assets - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) property	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Number of properties (property) \| property	253
Seattle \| Disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Number of properties (property) \| property	1
Seattle \| Disposed of by sale \| Disposed Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Proceeds from sale of real estate	$ 10.3
Gain on sale of real estate	$ 3.2
New York And New Jersey \| Disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Number of properties (property) \| property	1
New York And New Jersey \| Disposed of by sale \| Disposed Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Proceeds from sale of real estate	$ 32.7
Gain on sale of real estate	$ 13.4
Washington D.c. \| Disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Number of properties (property) \| property		3	2
Washington D.c. \| Disposed of by sale \| Disposed Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Proceeds from sale of real estate		$ 51.3	$ 22.5
Gain on sale of real estate		$ 17.8	$ 3.1
Miami \| Disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Number of properties (property) \| property		1	1
Miami \| Disposed of by sale \| Disposed Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Proceeds from sale of real estate		$ 22.2	$ 14.0
Gain on sale of real estate		$ 9.0	$ 1.8
Los Angeles \| Disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Number of properties (property) \| property			1
Los Angeles \| Disposed of by sale \| Disposed Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Proceeds from sale of real estate			$ 12.4
Gain on sale of real estate			$ 4.5