Summary of Critical and Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) community partnership investment property shares	Dec. 31, 2022 USD ($) community property partnership investment shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Accounting Policies [Abstract]
Limited partner - ownership percentage	3.40%	3.40%
Threshold useful life of assets for capitalization	1 year
Acquired in-place lease value, net	$ 6,100,000	$ 7,400,000
Number of properties held-for-sale | property	0	0
Casualty loss	$ 0	$ 0	$ 0
Lease term, minimum	9 months
Lease term, maximum	12 months
Original maturities highly liquid investments term classification as cash equivalents, maximum	3 months
Equity securities, FV-NI	$ 100,000	200,000
Capitalized internal costs related to development and redevelopment projects	19,500,000	20,400,000	23,600,000
Fixed rate debt carrying amount	5,700,000,000	5,700,000,000
Fixed rate debt fair value	5,300,000,000	5,200,000,000
Variable rate debt carrying amount	520,000,000	274,200,000
Variable rate debt fair value	519,000,000	273,200,000
Redeemable noncontrolling interest	$ 32,205,000	$ 27,150,000	34,666,000	$ 32,239,000
DownREIT limited partnerships consolidated by company (in partnerships) | partnership	18	18
Communities within DownREIT partnerships (in communities) | community	9	9
Number of consolidated co-investments that now meet the definition of a VIE | investment	6	6
Assets related to variable interest entities net of intercompany eliminations	$ 956,700,000	$ 939,400,000
Liabilities related to variable interest entities net of intercompany eliminations	324,500,000	324,300,000
Noncontrolling interests in VIE	$ 121,100,000	$ 121,500,000
Number of common stock shares per unit basis (in shares) | shares	1
Units of limited partnership interest amount (in shares) | shares	936,343	938,513
Redemption value of variable interest entities	$ 232,200,000	$ 198,900,000
Redeemable noncontrolling interest, units of limited partners' interests in DownREIT VIEs	12,100,000	9,200,000
Noncontrolling interest in limited partnerships	97,000,000	97,000,000
Employee retention credit	$ 0	$ 4,100,000	$ 4,200,000