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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
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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 |

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