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Revenue - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 01, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]        
Monthly resident fees   $ 25.2 $ 27.5  
Revenue recognized   $ 54.5 $ 60.2 $ 60.6
Government reimbursement | Revenue Benchmark | Customer Concentration Risk        
Disaggregation of Revenue [Line Items]        
Revenue   5.10% 10.30% 14.50%
CCRCs | Government reimbursement | Revenue Benchmark | Customer Concentration Risk        
Disaggregation of Revenue [Line Items]        
Revenue   18.00% 18.80% 18.50%
Securities Purchase Agreement | HCA Healthcare, Inc. | Health Care Services        
Disaggregation of Revenue [Line Items]        
Percentage of ownership sold in transaction 80.00%      
Deferred Revenue and Credits        
Disaggregation of Revenue [Line Items]        
Deferred revenue   $ 67.3 $ 67.5