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Gain (Loss) From Change Of Control

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Investment Company, Annual Percentage Increase

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Non Refundable Entrance Fee Liabilities

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Represents number of assets sold or transited per definitive agreements.

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Total consideration, cash and noncash, received by seller for the sale of real estate.

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Master Transactions and Cooperation Agreement with Brookdale (Details)		1 Months Ended						3 Months Ended		12 Months Ended
	Jan. 31, 2020 USD ($) bbl lease property	Dec. 31, 2020 USD ($) lease property	Nov. 30, 2020 USD ($)	Nov. 30, 2019 property	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Nov. 30, 2017 USD ($) property facility	Mar. 31, 2021 property	Dec. 31, 2018 USD ($) property	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($) property	Mar. 31, 2020 property	Oct. 31, 2019 property	Jan. 01, 2018 USD ($) property
Real Estate Properties [Line Items]
Property count	15
Capital investment \| $		$ 5,000,000									$ 5,000,000
Loss (gain) upon change of control, net \| $			$ 16,000,000								159,973,000	$ 168,023,000	$ 9,154,000
Long-term debt \| $		$ 6,616,855,000									6,616,855,000
Gain (loss) on sales of real estate, net \| $											$ 90,350,000	$ (40,000)	$ 831,368,000
Payments to acquire additional interest in subsidiaries \| $					$ 63,000,000	$ 32,000,000
Brookedale MTCA
Real Estate Properties [Line Items]
Number of assets to be sold									19
RIDEA Facilities
Real Estate Properties [Line Items]
Ownership percentage							90.00%
Assets leased to others
Real Estate Properties [Line Items]
Number of assets sold or transitioned												37
Assets leased to others \| Brookedale MTCA
Real Estate Properties [Line Items]
Gain (loss) on sales of real estate, net \| $									$ 40,000,000
Assets leased to others \| RIDEA Facilities
Real Estate Properties [Line Items]
Property count \| facility							58
Other Non-Reporting Segment
Real Estate Properties [Line Items]
Number of assets to be sold											1
Other Non-Reporting Segment \| Assets leased to others
Real Estate Properties [Line Items]
Property count														1
Other Non-Reporting Segment \| Assets leased to others \| CCRC JV Investment
Real Estate Properties [Line Items]
Property count														15	15
Senior Housing Triple Net
Real Estate Properties [Line Items]
Number of assets to be sold												2	2
Senior Housing Triple Net \| Assets leased to others
Real Estate Properties [Line Items]
Property count							78								43
Right to sell, or transition, number of properties (in properties)							32
Rent concessions \| $																$ 5,000,000
Number of properties with rent concessions (in properties)																3
Number of assets to be sold				2
Total consideration for disposition of real estate \| $							$ 35,000,000
Number of assets sold or transitioned												17
Senior Housing Triple Net \| Assets leased to others \| Brookedale MTCA
Real Estate Properties [Line Items]
Number of assets to be sold									11
Senior Housing Operating Portfolio
Real Estate Properties [Line Items]
Number of assets to be sold											23	18	23
Senior Housing Operating Portfolio \| Brookedale MTCA
Real Estate Properties [Line Items]
Number of assets to be sold									8
Senior Housing Operating Portfolio \| Assets leased to others
Real Estate Properties [Line Items]
Number of assets sold or transitioned												20
Senior Housing Operating Portfolio \| Assets leased to others \| Brookedale MTCA
Real Estate Properties [Line Items]
Number of assets to be sold							4
Senior Housing Operating Portfolio \| Assets leased to others \| RIDEA Facilities
Real Estate Properties [Line Items]
Property count \| facility							36
Total consideration for disposition of real estate \| $							$ 240,000,000
Discount rate \| Minimum
Real Estate Properties [Line Items]
Real estate capitalization rate \| bbl	0.10
Discount rate \| Maximum
Real Estate Properties [Line Items]
Real estate capitalization rate \| bbl	0.12
Cap rate \| Minimum
Real Estate Properties [Line Items]
Real estate capitalization rate \| bbl	0.07
Cap rate \| Maximum
Real Estate Properties [Line Items]
Real estate capitalization rate \| bbl	0.09
Measurement Input Annual Rent Escalators \| Minimum
Real Estate Properties [Line Items]
Real estate capitalization rate \| bbl	0.02
Measurement Input Annual Rent Escalators \| Maximum
Real Estate Properties [Line Items]
Real estate capitalization rate \| bbl	0.03
CCRC JV Investment
Real Estate Properties [Line Items]
Investment ownership percentage	49.00%	49.00%									49.00%	49.00%
Equity method investments \| $		$ 1,581,000									$ 1,581,000	$ 325,830,000
RIDEA Facilities
Real Estate Properties [Line Items]
Percent of noncontrolling interest acquired							10.00%
Brookedale MTCA
Real Estate Properties [Line Items]
Number of properties disposed	18										18	18
Cash proceeds \| $	$ 385,000,000
Gain (loss) on sales of real estate, net \| $	$ 164,000,000
Brookedale MTCA \| CCRC JV Investment
Real Estate Properties [Line Items]
Property count	15
Number of properties acquired	13
Equity method investments \| $	$ 323,000,000
Real estate and intangible assets \| $	1,800,000,000
Refundable entrance fee liabilities \| $	308,000,000
Non refundable entrance fee liabilities \| $	436,000,000										$ 484,000,000	$ 68,000,000
Long-term debt \| $	215,000,000
Working capital \| $	48,000,000
Payments to acquire equity method investments \| $	396,000,000
Brookedale MTCA \| CCRC JV Investment \| Other nonoperating income (expense)
Real Estate Properties [Line Items]
Loss (gain) upon change of control, net \| $	$ 170,000,000
Brookedale MTCA \| 2019 Amended Master Lease
Real Estate Properties [Line Items]
Annual rent escalator	2.40%
Brookedale MTCA \| Assets leased to others \| 2019 Amended Master Lease
Real Estate Properties [Line Items]
Number of properties to be restructured	24
Number of leases to be terminated (in properties) \| lease	1	1
Percent of sales proceeds	6.50%
Number of properties to be reallocated	14
Amount of future rent to be paid \| $	$ 20,000,000
Brookedale MTCA \| Assets leased to others \| 2019 Amended Master Lease \| Forecast
Real Estate Properties [Line Items]
Capital investment \| $										$ 35,000,000
Capital investment term										5 years
Annual percentage increase										7.00%
Brookedale MTCA \| Other Non-Reporting Segment \| Assets leased to others
Real Estate Properties [Line Items]
Property count	13
Brookedale MTCA \| Other Non-Reporting Segment \| Assets leased to others \| CCRC JV Investment
Real Estate Properties [Line Items]
Property count	13	13									13			13
Brookedale MTCA \| CCRC JV Investment
Real Estate Properties [Line Items]
Interest acquired	51.00%
Purchase cost \| $	$ 1,060,000,000.00
Non-cash lease and management fee termination loss (income), net \| $	$ 100,000,000
Brookedale MTCA \| CCRC JV Investment \| Forecast
Real Estate Properties [Line Items]
Number of assets to be sold								2