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Acquisitions, Dispositions, and Other Significant Leasing Transactions - Community Transactions (Details)
$ in Millions
12 Months Ended 36 Months Ended
Dec. 31, 2023
USD ($)
community
Dec. 31, 2022
USD ($)
community
Dec. 31, 2021
USD ($)
community
Dec. 31, 2023
community
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of communities leased   1    
Remaining equity interest 50.00%      
Number of communities acquired 1      
Communities Disposed of Through Lease Terminations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of communities disposed of 18 4 2 24
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Communities Disposed of Through Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of communities disposed of 2 2 3  
Cash proceeds | $ $ 25.6 $ 4.4 $ 16.5  
Mortgage debt repaid | $ 29.6      
Gain on sale of communities | $ $ 36.3