Commitments and Contingencies - Construction Activity (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2023 ft²	Jun. 30, 2022 USD ($) ft² property
Other Commitments [Line Items]
Number of real estate properties \| property			255
Medical office building \| Dallas, TX
Other Commitments [Line Items]
Square footage of building under redevelopment			217,114
Construction activity, total funding to date \| $			$ 10.2
Medical office building \| Tacoma, WA
Other Commitments [Line Items]
Construction activity, total funding to date \| $			$ 9.5
Approximate square feet			23,000
Medical office building \| Nashville, TN
Other Commitments [Line Items]
Construction activity, total funding to date \| $			$ 7.4
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
Other Commitments [Line Items]
Square footage of building under redevelopment			158,338
Number of real estate properties \| property			2
Medical office building \| Denver, CO
Other Commitments [Line Items]
Square footage of building under redevelopment			93,992
Medical office building 2 \| Dallas, TX
Other Commitments [Line Items]
Square footage of building under redevelopment			145,365
Construction activity, total funding to date \| $			$ 0.6
Medical office building 2 \| Washinton, DC
Other Commitments [Line Items]
Construction activity, total funding to date \| $			$ 0.1