Summary of Critical and Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) community investment partnership property shares	Dec. 31, 2023 USD ($) investment community property partnership shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Accounting Policies [Abstract]
Limited partner - ownership percentage	3.50%	3.40%
Threshold useful life of assets for capitalization	1 year
Acquired in-place lease value, net	$ 7,700,000	$ 6,100,000
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	100,000
Capitalized internal costs related to development and redevelopment projects	20,200,000	19,500,000	20,400,000
Fixed rate debt carrying amount	5,800,000,000	5,700,000,000
Fixed rate debt fair value	5,500,000,000	5,300,000,000
Variable rate debt carrying amount	752,300,000	520,000,000.0
Variable rate debt fair value	749,400,000	519,000,000.0
Redeemable noncontrolling interest	$ 30,849,000	$ 32,205,000	27,150,000	$ 34,666,000
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	5	6
Assets related to variable interest entities net of intercompany eliminations	$ 893,000,000.0	$ 956,700,000
Liabilities related to variable interest entities net of intercompany eliminations	319,100,000	324,500,000
Noncontrolling interests in VIE	$ 105,100,000	$ 121,100,000
Number of common stock shares per unit basis (in shares) | shares	1
Units of limited partnership interest amount (in shares) | shares	914,505	936,343
Redemption value of variable interest entities	$ 261,000,000.0	$ 232,200,000
Redeemable noncontrolling interest, units of limited partners' interests in DownREIT VIEs	9,000,000.0	12,100,000
Noncontrolling interest in limited partnerships	96,900,000	97,000,000.0
Employee retention credit	0	0	4,100,000
Gain (loss) from litigation settlement	$ 42,500,000	$ 7,700,000	$ 4,200,000