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Held for Sale/Disposed Assets - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) property	Sep. 30, 2018 USD ($) property
Redevelopment property, held for sale
Held For Sale Assets [Line Items]
Number of properties | property	1
Disposed of by sale | Washington D.C.
Held For Sale Assets [Line Items]
Sales price		$ 20.3
Number of properties sold | property		1
Gain on sale of property		$ 3.3
Disposed of by sale | Los Angeles
Held For Sale Assets [Line Items]
Sales price	$ 12.4
Number of properties sold | property	1
Gain on sale of property	$ 4.5
Disposed of by sale | Miami
Held For Sale Assets [Line Items]
Sales price	$ 14.0	$ 24.3
Number of properties sold | property	1	1
Gain on sale of property	$ 1.8	$ 11.7
Third-party purchaser | Held-for-sale | Washington D.C. | Industrial building
Held For Sale Assets [Line Items]
Number of properties | property	1
Sales price	$ 7.5
Sales price, book value	$ 6.0

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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