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Subsequent Events - Real Estate Investment Activity (Details)
$ in Millions
1 Months Ended 2 Months Ended 12 Months Ended
Feb. 12, 2020
USD ($)
property
Office
Feb. 25, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Subsequent Event [Line Items]          
Estimated gain on sale of properties     $ (1.3) $ (1.9) $ (3.1)
Property Disposition, 2020 [Member]          
Subsequent Event [Line Items]          
Carrying value of properties classified as held for sale     $ 14.2    
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Number of real estate properties acquired | property 23        
Total purchase price of assets acquired $ 127.8        
Subsequent Event [Member] | Property Disposition, 2020 [Member]          
Subsequent Event [Line Items]          
Number of real estate properties disposed | property 13        
Number of consolidated properties sold | Office 2        
Ownership % 20.00%        
Aggregate gross sales price $ 118.1        
Number of real estate property held for sale, disposed | property 4        
Estimated gain on sale of properties   $ 20.8