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PARTNERS' EQUITY OF THE PARENT COMPANY - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Jul. 20, 2022
$ / shares
May 18, 2022
USD ($)
$ / shares
Feb. 23, 2022
Jun. 30, 2022
$ / shares
Mar. 31, 2022
$ / 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
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