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Summary of Significant Accounting Policies (Details) ft² in Millions, $ in Millions	Jun. 30, 2022 USD ($) ft² property building state	Dec. 31, 2021 building
Business Overview:
Gross investment amount, total \| $	$ 5,400.0
Number of real estate properties \| property	255
Number of states that the company owns real estate in, whole units \| state	23
Approximate square feet invested in by company \| ft²	17.2
Approximate square feet for which Nationwide property management services provided by company \| ft²	15.4
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