Dispositions of Real Estate (Details)	1 Months Ended		3 Months Ended					9 Months Ended		12 Months Ended
	Nov. 30, 2024 USD ($) property	Jul. 31, 2024 USD ($) property	Sep. 30, 2025 USD ($) property	Jun. 30, 2025 USD ($) property	Sep. 30, 2024 USD ($) property	Jun. 30, 2024 USD ($) property	Mar. 31, 2024 USD ($) property	Sep. 30, 2025 USD ($) property	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sales of real estate, net			$ 11,500,000		$ 62,325,000			$ 13,136,000	$ 187,624,000
Assets held for sale, net			67,593,000					67,593,000		$ 7,840,000
Impairment of real estate			$ 0		$ 0			0	$ 0
Land Parcel
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | property				1		11
Proceeds from sale of property				$ 4,000,000
Gain (loss) on sales of real estate, net				$ 3,000,000
Outpatient Medical Buildings and Lab Buildings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sales of real estate, net						$ 122,000,000
Outpatient Medical Buildings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | property		59	2		59		2
Proceeds from sale of property		$ 674,000,000	$ 27,000,000		$ 674,000,000	$ 179,000,000	$ 29,000,000
Gain (loss) on sales of real estate, net			12,000,000		60,000,000		$ 3,000,000
Investments in loans receivable		$ 405,000,000			$ 405,000,000
Lab Buildings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | property						7
Proceeds from sale of property						$ 180,000,000
One Outpatient Medical Buildings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | property										1
Proceeds from sale of property										$ 12,000,000
Two Outpatient Medical Buildings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | property	2									2
Proceeds from sale of property	$ 23,000,000									$ 23,000,000
Investments in loans receivable	$ 14,000,000									14,000,000
CCRC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of property										12,000,000
Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale, net			68,000,000					68,000,000		8,000,000
Liabilities related to assets held for sale, net			$ 12,000,000					$ 12,000,000		$ 0
Held-for-sale | Outpatient Medical Buildings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties classified as held for sale | property										1
Held-for-sale | Lab Buildings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties classified as held for sale | property			6					6