Commitments and Contingencies - Construction Activity (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2023 ft²	Jun. 30, 2022 ft² property	Mar. 31, 2022 USD ($) ft² property
Other Commitments [Line Items]
Number of real estate properties | property				242
Medical office building | Forecast
Other Commitments [Line Items]
Number of real estate properties | property			2
Medical office building | Dallas, TX
Other Commitments [Line Items]
Square footage of building under redevelopment				217,114
Construction activity, total funding to date | $				$ 9.4
Medical office building | Tacoma, WA
Other Commitments [Line Items]
Construction activity, total funding to date | $				$ 7.5
Approximate square feet				23,000
Medical office building | Tacoma, WA | Forecast
Other Commitments [Line Items]
Approximate square feet			23,000
Medical office building | Nashville, TN
Other Commitments [Line Items]
Construction activity, total funding to date | $				$ 2.7
Square footage of building to be demolished				81,000
Impairment charge | $	$ 5.0
Medical office building | Nashville, TN | Forecast
Other Commitments [Line Items]
Approximate square feet		106,194
Medical office building | Washinton, DC | Forecast
Other Commitments [Line Items]
Square footage of building under redevelopment			158,338
Medical office building | Denver, CO | Forecast
Other Commitments [Line Items]
Square footage of building under redevelopment			93,992
Medical office building 2 | Dallas, TX
Other Commitments [Line Items]
Construction activity, total funding to date | $				$ 0.3
Medical office building 2 | Dallas, TX | Forecast
Other Commitments [Line Items]
Square footage of building under redevelopment			145,365