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Mortgage Notes Payable, Net - Narrative (Details) € in Millions, £ in Millions, $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 27, 2017 subsidiary property	Jan. 31, 2018 EUR (€) agreement	Sep. 30, 2018 USD ($)	Dec. 31, 2017 GBP (£)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 GBP (£)
Debt Instrument [Line Items]
Carrying value of encumbered assets			$ 1,400.0		$ 1,400.0
Number of subsidiaries (subsidiary) | subsidiary	12
Number of leased offices and industrial properties (property) | property	12
Mortgage notes payable
Debt Instrument [Line Items]
Outstanding loan amount in breach of covenant						$ 37.9	£ 28.1
Repayments of principal mortgage balance		€ 0.1	3.0	£ 0.8	1.7
Number of note payable agreements (agreement) | agreement		2
Line of Credit
Debt Instrument [Line Items]
Carrying value of encumbered assets			$ 1,300.0		$ 1,300.0

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- Definition

Debt Instrument, Collateral, Number Of Leased Offices And Industrial Properties

+ References

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- Definition

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- Definition

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- Definition

Number Of Subsidiaries

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- Definition

Real Estate and Accumulated Depreciation, Unencumbered Assets

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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