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Debt - Mortgage Debt (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
facility
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
facility
Sep. 30, 2020
USD ($)
Apr. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
facility
Debt Instrument            
Principal balance on debt $ 5,578,596,000   $ 5,578,596,000      
Weighted-average interest rate (as a percent) 0.22%   0.22%     0.30%
Medical office | Mortgage Debt            
Debt Instrument            
Amount         $ 142,000,000  
Weighted-average interest rate (as a percent)         2.68%  
Mortgage Debt            
Debt Instrument            
Principal balance on debt $ 354,596,000   $ 354,596,000     $ 217,000,000
Number of healthcare facilities used to secure debt (in facilities) | facility 19   19     6
Debt instrument, collateral, healthcare facilities carrying value $ 835,000,000   $ 835,000,000     $ 517,000,000
Debt instrument, periodic payment $ 1,000,000 $ 1,000,000 $ 4,000,000 $ 4,000,000    
Weighted-average interest rate (as a percent) 3.31%   3.31%