Debt - 2020 Financings (Details)	Sep. 09, 2020 USD ($) community	Aug. 31, 2020 USD ($) community	Mar. 31, 2020 USD ($) community	Mar. 20, 2020 USD ($) community	Mar. 19, 2020 USD ($) community	Jan. 31, 2020 USD ($) community	Aug. 29, 2019 USD ($) community	May 07, 2019 USD ($) community
Mortgage notes payable
Debt Instrument [Line Items]
Debt face amount	$ 156,500,000	$ 191,300,000	$ 73,100,000
Percentage bearing fixed interest						70.00%	75.00%	60.00%
Interest rate	3.18%	2.89%	3.55%			3.62%	3.35%	4.52%
Amount bearing variable interest	$ 64,000,000.0	$ 75,600,000	$ 76,200,000
Amount bearing fixed interest	220,500,000	266,900,000	149,300,000
Mortgage notes payable | Non-Recourse Supplemental Loan
Debt Instrument [Line Items]
Debt face amount	$ 220,500,000	$ 266,900,000	149,300,000	$ 30,000,000.0	$ 29,200,000	$ 238,200,000	$ 160,300,000	$ 111,100,000
Mortgage notes payable | Mortgage Debt Due 2020
Debt Instrument [Line Items]
Debt face amount			$ 136,300,000
Extinguishment of debt						$ 33,100,000	$ 139,200,000	$ 155,500,000
Secured Debt | Non-Recourse First Mortgages
Debt Instrument [Line Items]
Number of communities securing debt | community	27	16	18	1	7	14	5	14
LIBOR | Mortgage notes payable
Debt Instrument [Line Items]
Percentage bearing fixed interest						30.00%
Basis spread on variable rate basis	2.54%	2.49%	2.10%	2.50%	2.25%	2.09%	2.17%	2.23%
Healthpeak | Mortgage notes payable | Non-Recourse Supplemental Loan
Debt Instrument [Line Items]
Debt face amount						$ 192,600,000
Healthpeak | Secured Debt | Non-Recourse First Mortgages
Debt Instrument [Line Items]
Number of communities securing debt | community						13