Business Segments (Details Textual) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($) ApartmenthomeProperty Community Dwelling ApartmentHome Property Segment	Dec. 31, 2023 USD ($)	Jan. 01, 2023 ApartmentHome Property
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	3
Development and Redevelopment [Member]
Segment Reporting Information [Line Items]
Right-of-use lease assets | $	$ 108.4	$ 109.0
Lease liabilities | $	$ 120.4	$ 118.7
Continuing Operations [Member]
Segment Reporting Information [Line Items]
Number of real estate properties	5,600
Planned Apartment Homes [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Number of real estate properties | ApartmenthomeProperty	220
Planned Homes [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Number of real estate properties | Property	16
Accessory Dwelling Units [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Number of units in real estate property | Dwelling	8
Real Estate Partnership [Member]
Segment Reporting Information [Line Items]
Number of real estate properties | Community	10
Wholly And Partially Owned Consolidated Properties [Member] | Operating Portfolio Segment [Member]
Segment Reporting Information [Line Items]
Number of real estate properties | Property			21
Wholly And Partially Owned Consolidated Properties [Member] | Planned Apartment Homes [Member] | Operating Portfolio Segment [Member]
Segment Reporting Information [Line Items]
Number of units in real estate property			5,600
Unconsolidated Investment in IQHQ and Mezzanine Investment [Member]
Segment Reporting Information [Line Items]
Number of apartment communities | Community	4
Number of apartment homes	142