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Investments in Real Estate - Schedule of Acquisitions (Details) £ in Millions, ft² in Millions, $ in Millions | 9 Months Ended
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Sep. 30, 2019 GBP (£) ft² state property | Sep. 30, 2019 USD ($) ft² state property | Sep. 30, 2018 USD ($) ft² property
Real Estate [Line Items] |  |  |
Number of properties | property | 241 | 241 | 591
Square feet (sq ft) | ft² | 7.8 | 7.8 | 4.3
Investment | $ |  | $ 2,025.7 | $ 1,465.4
Weighted average lease term (years) | 15 years 6 months | 15 years 6 months | 14 years 4 months 24 days
Initial average cash lease yield (percent) | 6.20% | 6.20% | 6.30%
New properties |  |  |
Real Estate [Line Items] |  |  |
Number of properties, new | property | 227 | 227 |
Square feet (sq ft) | ft² | 7.4 | 7.4 |
Investment | $ |  | $ 1,989.7 |
Weighted average lease term (years) | 15 years 6 months | 15 years 6 months |
Initial average cash lease yield (percent) | 6.10% | 6.10% |
New properties | U.S. |  |  |
Real Estate [Line Items] |  |  |
Number of properties, new | property | 214 | 214 | 580
Number of states | 38 | 38 | 37
Square feet (sq ft) | ft² | 6.2 | 6.2 | 3.2
Investment | $ |  | $ 1,412.9 | $ 1,395.7
Weighted average lease term (years) | 15 years 8 months 12 days | 15 years 8 months 12 days | 14 years 7 months 6 days
Initial average cash lease yield (percent) | 6.50% | 6.50% | 6.30%
New properties | U.K. |  |  |
Real Estate [Line Items] |  |  |
Number of properties, new | property | 13 | 13 |
Square feet (sq ft) | ft² | 1.2 | 1.2 |
Investment | £ 456.1 | $ 576.8 |
Weighted average lease term (years) | 15 years | 15 years |
Initial average cash lease yield (percent) | 5.20% | 5.20% |
Properties under development | U.S. |  |  |
Real Estate [Line Items] |  |  |
Number of properties, under development | property | 14 | 14 | 11
Square feet (sq ft) | ft² | 0.4 | 0.4 | 1.1
Investment | $ |  | $ 36.0 | $ 69.7
Weighted average lease term (years) | 16 years | 16 years | 10 years 10 months 24 days
Initial average cash lease yield (percent) | 7.40% | 7.40% | 6.80%

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- Definition For new properties during the period, the weighted average contractual lease rate computed as estimated contractual net operating income (in a net-leased property that is equal to the aggregate base rent or, in the case of properties under development, the estimated aggregate base rent under the lease) for the first year of each lease, divided by the estimated total cost of the properties. + References No definition available. + Details
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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919359-209981 + Details
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