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PARTNERS' EQUITY OF THE PARENT COMPANY - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Sep. 20, 2023
USD ($)
$ / shares
Jan. 03, 2019
Sep. 30, 2023
$ / shares
Jun. 30, 2023
$ / shares
Mar. 31, 2023
$ / shares
Sep. 30, 2022
$ / shares
Jun. 30, 2022
$ / shares
Mar. 31, 2022
$ / shares
Earnings Per Common Partnership Unit [Line Items]                
Distributions declared (in dollars per share) | $ / shares $ 0.15   $ 0.15 $ 0.19 $ 0.19 $ 0.19 $ 0.19 $ 0.19
Dividends, common stock | $ $ 26.0              
BRANDYWINE OPERATING PARTNERSHIP, L.P.                
Earnings Per Common Partnership Unit [Line Items]                
Distributions declared (in dollars per share) | $ / shares $ 0.15              
Dividends, common stock | $ $ 26.0              
Repurchase program, ratio of mirror unit of operating partnership retired for each common share repurchased   1