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REAL ESTATE INVESTMENTS - Held for Use Impairment and Sale (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
property
Dec. 31, 2023
USD ($)
property
Dec. 31, 2022
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of real estate properties | property 64    
Impairment long lived asset held for use statement of income or comprehensive income extensible enumeration not disclosed flag   impairment losses  
Assets held for sale $ 0.0 $ 0.0  
Other      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Impairment of properties held for use $ 23.5 $ 103.2 $ 4.7
Number of real estate properties | property 1 3  
Other | Discount Rates | Valuation Technique, Discounted Cash Flow      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Debt securities, trading, measurement input   0.1000  
Other | Measurement Input, Capitalization Rate | Valuation Technique, Discounted Cash Flow      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Debt securities, trading, measurement input   0.0850  
Pennsylvania Suburbs Segment | Office Properties      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Provision for impairment on assets held for sale   $ 11.7