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Held for Sale/Disposed Assets - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) property	Jun. 30, 2018 USD ($) property
Redevelopment property, held for sale
Held For Sale Assets [Line Items]
Number of buildings | property	1
Held-for-sale | Miami | Redevelopment property, held for sale
Held For Sale Assets [Line Items]
Number of buildings | property	1
Disposed of by sale | Miami
Held For Sale Assets [Line Items]
Sales price		$ 24.3
Number of properties sold | property		1
Gain on sale of property		$ 11.7
Disposed of by sale | Los Angeles
Held For Sale Assets [Line Items]
Sales price	$ 12.4
Number of properties sold | property	1,000,000
Gain on sale of property	$ 4.5
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
Third-party purchaser | Held-for-sale | Miami | Industrial building
Held For Sale Assets [Line Items]
Sales price	14.0
Sales price, book value	$ 11.6

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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
-Paragraph 28
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 360
-Section 50
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-URI http://asc.fasb.org/extlink&oid=117337411&loc=d3e23528-158515

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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