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Mortgage Notes Payable, Net - Finnish Refinancing (Details) - Mortgages € in Millions, $ in Millions			3 Months Ended
	Feb. 06, 2019 EUR (€)	Feb. 06, 2019 USD ($)	Mar. 31, 2019 property	Feb. 06, 2019 USD ($)
Debt Instrument [Line Items]
Encumbered Properties (property)			93
Finland
Debt Instrument [Line Items]
Proceeds from refinancing	€ 74.0	$ 84.2
Debt bearing fixed interest rate	€ 59.2			$ 67.4
Debt bearing fixed interest, percentage of total	80.00%			80.00%
Interest rate	1.80%			1.80%
Repayments of debt	€ 57.4	$ 65.3
Finland | Euribor
Debt Instrument [Line Items]
Interest rate spread	1.40%	1.40%
Finland
Debt Instrument [Line Items]
Debt bearing fixed interest, percentage of total			80.00%
Finland | Euribor
Debt Instrument [Line Items]
Interest rate spread			1.40%
EUR
Debt Instrument [Line Items]
Encumbered Properties (property)			20
EUR | Finland
Debt Instrument [Line Items]
Encumbered Properties (property)			5

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