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Investments in Real Estate - Schedule of Acquisitions Narrative (Details) $ in Thousands, £ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) property_investment industry	Dec. 31, 2020 GBP (£) property_investment industry	Dec. 31, 2019 USD ($) property_investment industry	Dec. 31, 2019 GBP (£) property_investment industry
Investments in real estate properties
Number of investments in properties that caused any client to be 10% of more of total assets | property_investment	0	0	0	0
Value of properties acquired during the period	$ 2,307,281		$ 3,715,237
Rental revenue generated from acquisitions from investment grade clients (percent)	61.00%	61.00%	36.00%	36.00%
Industrial
Investments in real estate properties
Property type acquired based on rental revenue (percent)			5.40%	5.40%
New and under development
Investments in real estate properties
Acquired properties, percentage leased at the acquisition date (as a percent)	100.00%	100.00%	100.00%	100.00%
New properties
Investments in real estate properties
Value of properties acquired during the period	$ 2,223,154		$ 3,658,652
Number of industries in which tenants operate | industry	26	26	31	31
New properties | Retail
Investments in real estate properties
Property type acquired based on rental revenue (percent)	86.60%	86.60%	94.60%	94.60%
New properties | Industrial
Investments in real estate properties
Property type acquired based on rental revenue (percent)	13.40%	13.40%
New properties | U.K.
Investments in real estate properties
Value of properties acquired during the period	$ 920,934	£ 707.8	$ 797,846	£ 625.8

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- Definition

Represents the portion of real estate properties leased during the period with existing tenant lease agreements in place expressed as a percentage of total area.

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- Definition

Represents the number of industries in which tenants of the real estate properties acquired during the period operate.

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- Definition

Represents the percentage of the real estate properties acquired during the period by the type of real estate.

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- Definition

Represents the number of investments in properties that caused any tenant to be 10 percent or more of total assets.

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No definition available.

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- Definition

Real Estate Property Investments, Value Of Properties Acquired

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- Definition

Rental Revenue Generated From Acquisitions, Investment Grade Tenants, Percentage

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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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No definition available.

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- Details

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