Commitments and Contingencies - Construction Activity (Details) $ in Millions	3 Months Ended
	Jun. 30, 2021 USD ($) ft²	Jul. 31, 2021 ft²	Apr. 30, 2021 ft²
Other Commitments [Line Items]
Approximate square feet	16,300,000
Medical office building | Dallas, Texas
Other Commitments [Line Items]
Square footage of building under redevelopment	110,860
Approximate square feet	217,114
Construction activity, total funding to date | $	$ 0.5
Medical office building | Memphis, Tennessee
Other Commitments [Line Items]
Approximate square feet	110,883
Construction activity, total funding to date | $	$ 28.1
Medical office building | Tacoma, WA
Other Commitments [Line Items]
Approximate square feet			23,000
Construction activity, total funding to date | $	1.3
Medical office building | Nashville, TN
Other Commitments [Line Items]
Impairment charge | $	$ 5.0
Medical office building | Nashville, TN | Subsequent event
Other Commitments [Line Items]
Approximate square feet		106,194
Square footage of building to be demolished		81,000