Summary of Significant Accounting Policies (Details) ft² in Millions, $ in Millions	Mar. 31, 2022 USD ($) ft² building state property	Dec. 31, 2021 building
Business Overview:
Gross investment amount, total | $	$ 5,200.0
Number of real estate properties | property	242
Number of states that the company owns real estate in, whole units | state	23
Approximate square feet invested in by company | ft²	16.9
Approximate square feet for which Nationwide property management services provided by company | ft²	14.8
Joint venture ownership (percent)	50.00%
Number of buildings owned by joint venture with TIAA | building	21
Equity ownership for consolidation (percent)	100.00%
Nashville, Tennessee | Medical office building
Leases [Abstract]
Number of buildings acquired in sale leaseback transactions | building		2
Buildings acquired in sale leaseback transactions | $	$ 73.9