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Debt - Mortgage Debt (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
facility
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
facility
Jun. 30, 2020
USD ($)
Apr. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
facility
Debt Instrument            
Principal balance on debt $ 5,076,024,000   $ 5,076,024,000      
Weighted-average interest rate (as a percent) 0.24%   0.24%     0.30%
Medical office | Mortgage Debt            
Debt Instrument            
Amount         $ 142,000,000  
Weighted-average interest rate (as a percent)         2.60%  
Mortgage Debt            
Debt Instrument            
Principal balance on debt $ 356,024,000   $ 356,024,000     $ 217,000,000
Number of healthcare facilities used to secure debt (in facilities) | facility 19   19     6
Debt instrument, collateral, healthcare facilities carrying value $ 845,000,000   $ 845,000,000     $ 517,000,000
Debt instrument, periodic payment $ 1,000,000 $ 1,000,000 $ 3,000,000 $ 2,000,000    
Weighted-average interest rate (as a percent) 3.28%   3.28%