Investments in Real Estate - Acquisitions Footnotes (Details) $ in Thousands, £ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) property	Sep. 30, 2022 GBP (£) property	Sep. 30, 2021 USD ($) property	Sep. 30, 2021 GBP (£) property
Real Estate [Line Items]
Settlement credits as reimbursement for acquired rent free period	$ 8,000		$ 3,200
Value of properties acquired during the period	$ 5,098,600		$ 3,775,900
Rental revenue generated from acquisitions from investment grade tenants (as a percent)	30.00%	30.00%	43.00%	43.00%
Properties under development
Real Estate [Line Items]
Number of properties, under development | property	127	127	50	50
Value of properties acquired during the period	$ 416,400		$ 182,000
Retail
Real Estate [Line Items]
Property type acquired based on rental revenue (as a percent)	90.60%	90.60%	80.20%	80.20%
Industrial
Real Estate [Line Items]
Property type acquired based on rental revenue (as a percent)	9.30%	9.30%	19.80%	19.80%
Other Property
Real Estate [Line Items]
Property type acquired based on rental revenue (as a percent)	0.10%	0.10%
U.K. | Properties under development
Real Estate [Line Items]
Number of properties, under development | property	5	5	1	1
Value of properties acquired during the period | £		£ 36.6		£ 4.7