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