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Nature of Business and Financial Statement Presentation (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
ft²
Jun. 30, 2019
USD ($)
ft²
Property
Jun. 30, 2018
USD ($)
ft²
Nture of Oerations and Financial Statements Presentation [Line Items]      
GLA | ft² 12,739 349,410 12,739
Capitalized indirect internal leasing overhead costs | $   $ 2.0  
Accounting Standards Update 2016-02      
Nture of Oerations and Financial Statements Presentation [Line Items]      
Capitalized indirect internal leasing overhead costs | $ $ 2.6   $ 5.5
Shopping Center      
Nture of Oerations and Financial Statements Presentation [Line Items]      
Number of real estate properties | Property   421  
GLA | ft²   73,000,000  
Parent Company | BPG Sub      
Nture of Oerations and Financial Statements Presentation [Line Items]      
Ownership percentage   100.00%