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PARTNERS' EQUITY OF THE PARENT COMPANY - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended
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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 |  |  |  |  |  |

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