Leases - Schedule of right-of-use assets and lease liabilities related to ground leases (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Key Terms:
Weighted-average remaining lease term (years)	68 years 9 months 18 days	69 years 6 months
Weighted-average discount rate	7.44%	7.71%
Ground
Assets:
Right-of-use assets, at fair value	$ 41.1	$ 40.3
Liabilities:
Ground lease liabilities, at fair value	$ 41.1	$ 40.3