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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 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 + Details
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