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Investments in Real Estate - Properties with Existing Leases Narrative (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2020 USD ($) property | Sep. 30, 2019 USD ($) property
Real Estate Properties [Line Items] |  |
Value of properties acquired during the period | $ 1,298.9 | $ 2,025.7
Number of properties acquired during the period | property | 180 | 241
Rental Revenue |  |
Real Estate Properties [Line Items] |  |
Amortization of above and below market Leases | $ 20.4 | $ 14.3
In-place leases |  |
Real Estate Properties [Line Items] |  |
Depreciation and amortization expense | 99.7 | 84.5
Real Estate Investment |  |
Real Estate Properties [Line Items] |  |
Value of properties acquired during the period | 1,300.0 | 2,000.0
Real Estate Investment | Properties with existing leases | In-place leases |  |
Real Estate Properties [Line Items] |  |
Value of properties acquired during the period | $ 1,000.0 | $ 1,230.0
Number of properties acquired during the period | property | 96 | 100

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- Definition Amount of non-cash amortization of intangible asset (liability) for above and below market leases. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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