Leases - Ground Leases (Details) ft² in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) ft² property lease	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Real Estate [Line Items]
Number of properties subject to ground leases | property	109
Square feet subject to ground leases | ft²	9.1
Number of ground leases prepaid	41
Amortization of prepaid rent | $	$ 0.6	$ 0.6	$ 0.6
Number of ground leases, excluding prepaid leases	68
Minimum
Real Estate [Line Items]
Ground leases, initial term	40 years
Maximum
Real Estate [Line Items]
Ground leases, initial term	99 years