Real Estate and Other Activities - Disposals - 2023 Activity Additional Information (Detail) $ in Millions, $ in Millions					3 Months Ended		6 Months Ended
	Jul. 11, 2023 USD ($) Facility	May 18, 2023 AUD ($) Facility	Mar. 29, 2023 Facility	Mar. 08, 2023 USD ($)	Mar. 31, 2023 USD ($) Facility	Mar. 31, 2023 AUD ($) Facility	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($) Facility
Debt Instrument [Line Items]
Number of facilities sold | Facility								4
Proceeds from sale of facilities								$ 154.0
Net impairment charge					$ 79.0
Straight-line rent receivables					37.4
Estimated fees to sell the hospitals					8.0
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax					13.0
Deferred gains from our interest rate swap in AOCI					$ 29.0
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]					Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax
Australia Transaction [Member]
Debt Instrument [Line Items]
Number of facilities sold | Facility		7
Proceeds from sale of facilities		$ 730				$ 1,200
Proceeds from sale to paydown		$ 730
Australia [Member] | General Acute Care Facility [Member]
Debt Instrument [Line Items]
Number of facilities sold | Facility			11
Prime [Member]
Debt Instrument [Line Items]
Number of facilities sold | Facility					3	3
Proceeds from sale of facilities				$ 100.0
Non-cash impairment charge					$ 11.0		$ 11.0
Prime [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Facilities acquired by the Prime	$ 100.0
Number of facilities acquired | Facility	3