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Summary of Significant Accounting Policies - Basis of Presentation to Real Estate Assets (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Summary Of Significant Accounting Policies [Line Items]        
Maximum exposure to losses $ 12.4   $ 12.4  
Depreciation expense from operation 48.7 $ 38.0 94.2 $ 73.7
Real estate cost capitalized excluding interest cost 7.0 4.8 12.5 9.3
Real estate interest cost capitalized incurred (7.8) (7.7) $ (14.8) (15.8)
Real Property        
Summary Of Significant Accounting Policies [Line Items]        
Useful life of property     40 years  
Real Property | Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Useful life of property     20 years  
Real Property | Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Useful life of property     40 years  
Leasehold Improvements | Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Useful life of property     20 years  
Real Estate Assets        
Summary Of Significant Accounting Policies [Line Items]        
Depreciation expense from operation 45.4 34.7 $ 88.1 67.0
Non-Real Estate Assets        
Summary Of Significant Accounting Policies [Line Items]        
Depreciation expense from operation $ 3.2 $ 3.4 $ 6.1 $ 6.7