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PARTNERS' EQUITY OF THE PARENT COMPANY - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Feb. 16, 2023
USD ($)
$ / shares
Oct. 20, 2022
USD ($)
$ / shares
Sep. 13, 2022
$ / shares
Feb. 23, 2022
Mar. 31, 2023
$ / shares
Mar. 31, 2022
$ / shares
Earnings Per Common Partnership Unit [Line Items]            
Distributions declared (in dollars per share) $ 0.19       $ 0.19 $ 0.19
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      
Dividends, common stock | $   $ 32.8        
Repurchase program, ratio of mirror unit of operating partnership retired for each common share repurchased       1