Real Estate and Other Activities - Summary of Operating Results from Properties Sold (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Net impairment charge	$ 82.0
Disposal Group, Not Discontinued Operations [Member]
Business Acquisition [Line Items]
Straight-line rent write-offs		$ 35.0		$ 42.0
Massachusetts-based General Acute Care Hospitals [Member]
Business Acquisition [Line Items]
Straight-line rent write-offs		125.0		125.0
Massachusetts-based General Acute Care Hospitals [Member] | Disposal Group, Not Discontinued Operations [Member]
Business Acquisition [Line Items]
Gains		$ 68.8		$ 536.8
Australia Transaction [Member]
Business Acquisition [Line Items]
Straight-line rent write-offs			$ 37.4
Net impairment charge			82.0
Prime [Member]
Business Acquisition [Line Items]
Non-cash impairment charge	$ 11.0		$ 11.0