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REAL ESTATE INVESTMENTS - Held for Use Impairment and Sale (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
property
Dec. 31, 2022
USD ($)
Jan. 20, 2022
USD ($)
Dec. 31, 2021
USD ($)
a
parcel
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Impairment of properties held for use   $ 4.7    
Number of real estate properties | property 72      
Impairment long lived asset held for use statement of income or comprehensive income extensible enumeration not disclosed flag impairment losses      
Other        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Impairment of properties held for use $ 103.2      
Number of real estate properties | property 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 | 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      
Held for Sale Properties Included in Continuing Operations | Other Land        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Assets held for sale, net       $ 0.6
Aggregate sales price     $ 1.6  
Held for Sale Properties Included in Continuing Operations | Other Land | Other        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of land parcels | parcel       2
Land area | a       10.0