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PARTNERS' EQUITY OF THE PARENT COMPANY - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Oct. 20, 2022
USD ($)
$ / shares
Sep. 13, 2022
$ / shares
Feb. 23, 2022
Sep. 30, 2022
$ / shares
Jun. 30, 2022
$ / shares
Mar. 31, 2022
$ / shares
Sep. 30, 2021
$ / shares
Jun. 30, 2021
$ / shares
Mar. 31, 2021
$ / shares
Earnings Per Common Partnership Unit [Line Items]                  
Distributions declared (in dollars per share)   $ 0.19   $ 0.19 $ 0.19 $ 0.19 $ 0.19 $ 0.19 $ 0.19
Subsequent Event                  
Earnings Per Common Partnership Unit [Line Items]                  
Dividends paid in cash (in dollars per share) $ 0.19                
Dividends, common stock | $ $ 32.8                
BRANDYWINE OPERATING PARTNERSHIP, L.P.                  
Earnings Per Common Partnership Unit [Line Items]                  
Distributions declared (in dollars per share)   $ 0.19              
Repurchase program, ratio of mirror unit of operating partnership retired for each common share repurchased     1            
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Subsequent Event                  
Earnings Per Common Partnership Unit [Line Items]                  
Dividends, common stock | $ $ 32.8