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Mortgage Notes Payable, Net - Finnish Refinancing (Details) - Finland € in Millions, $ in Millions			9 Months Ended
	Feb. 06, 2019 EUR (€) property	Feb. 06, 2019 USD ($) property	Sep. 30, 2019	Feb. 06, 2019 USD ($)
Debt Instrument [Line Items]
Collateral, number of leased offices and industrial properties	5	5
Mortgages
Debt Instrument [Line Items]
Proceeds from refinancing	€ 74.0	$ 84.2
Debt bearing fixed interest rate	€ 59.2			$ 67.4
Percentage fixed interest rate	80.00%		80.00%	80.00%
Interest rate spread	1.80%	1.80%
Repayments of debt	€ 57.4	$ 65.3
Mortgages | Euribor
Debt Instrument [Line Items]
Interest rate	1.40%			1.40%
Interest rate spread			1.40%

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Contractual interest rate for funds borrowed, under the debt agreement.

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