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Business Segments (Details Textual)
3 Months Ended
Mar. 31, 2022
USD ($)
Property
ApartmentHome
Home
Dwelling
Hotel
Room
Segment
Community
Dec. 31, 2021
USD ($)
Jan. 01, 2021
Property
Business Segments (Textual) [Abstract]      
Number of reportable segments | Segment 3    
Development and Redevelopment [Member]      
Business Segments (Textual) [Abstract]      
Right-of-use lease assets | $ $ 522.9 $ 429.8  
Lease liabilities | $ $ 509.2 $ 435.1  
Continuing Operations [Member]      
Business Segments (Textual) [Abstract]      
Number of real estate properties | Property 29    
Residential Apartment Communities in Redevelopment [Member] | Continuing Operations [Member]      
Business Segments (Textual) [Abstract]      
Number of real estate properties | Community 3    
Planned Apartment Homes [Member] | Continuing Operations [Member]      
Business Segments (Textual) [Abstract]      
Number of units in real estate property | ApartmentHome 1,331    
Planned Homes [Member] | Continuing Operations [Member]      
Business Segments (Textual) [Abstract]      
Number of real estate properties | Home 16    
Accessory Dwelling Units [Member] | Continuing Operations [Member]      
Business Segments (Textual) [Abstract]      
Number of units in real estate property | Dwelling 8    
Hotel [Member] | Continuing Operations [Member]      
Business Segments (Textual) [Abstract]      
Number of real estate properties | Hotel 1    
Planned Rooms [Member] | Continuing Operations [Member]      
Business Segments (Textual) [Abstract]      
Number of units in real estate property | Room 106    
Wholly And Partially Owned Consolidated Properties [Member] | Operating Portfolio Segment [Member]      
Business Segments (Textual) [Abstract]      
Number of real estate properties | Property 24    
Wholly And Partially Owned Consolidated Properties [Member] | Residential Apartment Communities in Redevelopment [Member] | Operating Portfolio Segment [Member]      
Business Segments (Textual) [Abstract]      
Number of real estate properties | Property     24
Wholly And Partially Owned Consolidated Properties [Member] | Residential Apartment Communities in Redevelopment [Member] | Continuing Operations [Member] | Development and Redevelopment [Member]      
Business Segments (Textual) [Abstract]      
Number of real estate properties | Property 3    
Wholly And Partially Owned Consolidated Properties [Member] | Planned Apartment Homes [Member] | Development and Redevelopment [Member]      
Business Segments (Textual) [Abstract]      
Number of units in real estate property | ApartmentHome 499    
Wholly And Partially Owned Consolidated Properties [Member] | Planned Apartment Homes [Member] | Operating Portfolio Segment [Member]      
Business Segments (Textual) [Abstract]      
Number of units in real estate property | ApartmentHome 6,067    
Wholly And Partially Owned Consolidated Properties [Member] | Accessory Dwelling Units [Member] | Development and Redevelopment [Member]      
Business Segments (Textual) [Abstract]      
Number of units in real estate property | Dwelling 8    
Wholly And Partially Owned Consolidated Properties [Member] | Hotel [Member] | Development and Redevelopment [Member]      
Business Segments (Textual) [Abstract]      
Number of units in real estate property | Hotel 1    
Wholly And Partially Owned Consolidated Properties [Member] | Planned Rooms [Member] | Development and Redevelopment [Member]      
Business Segments (Textual) [Abstract]      
Number of units in real estate property | Room 106    
Wholly And Partially Owned Consolidated Properties [Member] | Real Estate Partnership [Member] | Development and Redevelopment [Member]      
Business Segments (Textual) [Abstract]      
Number of real estate properties | Community 13    
Wholly And Partially Owned Consolidated Properties [Member] | Real Estate Partnership [Member] | Planned Apartment Homes [Member] | Development and Redevelopment [Member]      
Business Segments (Textual) [Abstract]      
Number of units in real estate property | ApartmentHome 1,331    
Wholly And Partially Owned Consolidated Properties [Member] | Real Estate Partnership [Member] | Planned Homes [Member] | Development and Redevelopment [Member]      
Business Segments (Textual) [Abstract]      
Number of units in real estate property | Home 16