Real Estate and Other Activities - Disposals - 2024 Activity - Additional Information (Detail) £ in Millions, $ in Millions			3 Months Ended			6 Months Ended
	Apr. 12, 2024 USD ($) Hospital	Apr. 09, 2024 USD ($) Property	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2024 GBP (£)	Jun. 30, 2025 USD ($) Facility	Jun. 30, 2024 USD ($) Facility
Debt Instrument [Line Items]
Profit (loss) from real estate operations						$ 48.0	$ 7.0
Number of facilities sold | Facility						3	3
Number of ancillary facilities sold | Facility							2
Gain (loss) on real estate dispositions						$ 13.3	$ 1.4
Springstone Health Opco, LLC [Member]
Debt Instrument [Line Items]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable				$ 12.0
Prime Healthcare Services, Inc. Facilities [Member]
Debt Instrument [Line Items]
Number of properties sold | Property		5
Proceeds from sale of investments		$ 250.0
Gain (loss) on real estate dispositions		53.0
Proceeds from interest-bearing mortgage loan		100.0
Non-cash straight-line rent write-offs		30.0
Lease purchase option value		238.0
Lease purchase option price reverts		$ 260.0
Prime Healthcare Services, Inc. Facilities [Member] | Minimum [Member]
Debt Instrument [Line Items]
Inflation-based Percentage for Amended Lease		2.00%
Prime Healthcare Services, Inc. Facilities [Member] | Maximum [Member]
Debt Instrument [Line Items]
Inflation-based Percentage for Amended Lease		4.00%
Behavioral Health Hospitals [Member]
Debt Instrument [Line Items]
Profit (loss) from real estate operations			$ 10.5	35.4
General Acute Care Facility [Member]
Debt Instrument [Line Items]
Profit (loss) from real estate operations				$ 49.0	£ 46
Institutional Asset Manager [Member]
Debt Instrument [Line Items]
Number of utah hospitals sold | Hospital	5
Gain (loss) on real estate dispositions	$ 380.0