Investments in Real Estate - Acquisitions Allocation (Details) £ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2023 GBP (£)
Acquisitions
Weighted average amortization period for acquired lease intangible assets	11 years 3 months 18 days	11 years 3 months 18 days
Weighted average amortization period for acquired lease intangible liabilities	18 years 9 months 18 days	18 years 9 months 18 days
Real Estate Investment
Acquisitions
Land	$ 243.9	£ 74.2
Buildings and improvements	794.6	153.0
Lease intangible assets	231.9	38.1
Other assets	59.8	54.5
Lease intangible liabilities	(84.7)	(3.8)
Other liabilities	(0.6)	0.0
Net	1,244.9	316.0
Allocated to land, right of use assets under long-term ground leases		1.7
Allocated to other assets, financing receivables with above-market terms	59.8	8.6
Allocated to other assets, finance lease right-of-use assets		£ 45.8
Deferred rent on below market leases | $	$ 0.6