Investments in Real Estate - Acquisitions Footnotes (Details) £ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) property	Mar. 31, 2022 GBP (£) property	Mar. 31, 2021 USD ($) property
Real Estate [Line Items]
Settlement credits as reimbursement for acquired rent free period | $	$ 4.3
Number of properties related to settlement credits | property	16	16
Value of properties acquired during the period | $	$ 1,555.3		$ 1,027.8
Rental revenue generated from acquisitions from investment grade tenants (as a percent)	26.00%	26.00%	39.00%
Properties under development
Real Estate [Line Items]
Number of properties, under development | property	53	53	21
Value of properties acquired during the period | $	$ 131.3		$ 57.9
Retail
Real Estate [Line Items]
Property type acquired based on rental revenue (as a percent)	85.40%	85.40%	65.10%
Industrial
Real Estate [Line Items]
Property type acquired based on rental revenue (as a percent)	14.60%	14.60%	34.90%
U.K. | Properties under development
Real Estate [Line Items]
Number of properties, under development | property	1	1
Value of properties acquired during the period | £		£ 1.7