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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, 2019 USD ($) property | Sep. 30, 2018 USD ($) property
Real Estate Properties [Line Items] |  |
Value of properties acquired during the period | $ 2,025.7 | $ 1,465.4
Number of properties acquired during the period | property | 241 | 591
Rental Revenue |  |
Real Estate Properties [Line Items] |  |
Amortization of above and below market Leases | $ 14.3 | $ 12.4
In-place leases |  |
Real Estate Properties [Line Items] |  |
Depreciation and amortization expense | 84.5 | 79.8
Real Estate Investment |  |
Real Estate Properties [Line Items] |  |
Value of properties acquired during the period | 2,000.0 | 1,470.0
Real Estate Investment | Properties with existing leases | In-place leases |  |
Real Estate Properties [Line Items] |  |
Value of properties acquired during the period | $ 1,230.0 | $ 307.5
Number of properties acquired during the period | property | 100 | 147

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