Face (par) amount of debt instrument at time of issuance.

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Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Debt - 2021 Financings (Details) $ in Millions	Dec. 17, 2021 USD ($) community extensionOption	Mar. 20, 2020 USD ($) community	Sep. 09, 2020 USD ($) community	Aug. 31, 2020 USD ($) community	Mar. 31, 2020 USD ($) community	Mar. 19, 2020 USD ($) community	Jan. 31, 2020 USD ($) community
First Mortgage Financing
Debt Instrument [Line Items]
Debt face amount			$ 156.5	$ 191.3	$ 73.1
First Mortgage Financing \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate basis	2.15%
Non-Recourse Supplemental Loan \| First Mortgage Financing
Debt Instrument [Line Items]
Debt face amount	$ 100.0	$ 30.0	$ 220.5	$ 266.9	$ 149.3	$ 29.2	$ 238.2
Number of options to extend \| extensionOption	2
Period of extension	1 year	1 year
Non-Recourse First Mortgages \| Secured Debt
Debt Instrument [Line Items]
Number of communities securing debt \| community	11	1	27	16	18	7	14