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Disposals of Properties (Details) - Disposed of by Sale
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
groundLease
Jun. 30, 2020
property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Number of ground lease properties | groundLease 16  
Gross proceeds from sale of ground lease property $ 40.0  
Net gain from sale of ground lease property $ 26.2  
Number of real estate properties | property   0