Summary of Critical and Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2025 USD ($) investment community property partnership shares	Dec. 31, 2024 USD ($) community investment property partnership lawsuit shares	Dec. 31, 2023 USD ($) community	Dec. 31, 2022 USD ($)
Real Estate Properties [Line Items]
Limited partner - ownership percentage	3.40%	3.50%
Threshold useful life of assets for capitalization	1 year
Acquired in-place lease value, net	$ 7,500,000	$ 7,700,000
Number of properties held-for-sale | property	0	0
Casualty loss	$ 0	$ 0	$ 0
Equity securities, FV-NI	100,000	100,000
Capitalized internal costs related to development and redevelopment projects	26,200,000	20,200,000	19,500,000
Fixed rate debt carrying amount	5,900,000,000	5,800,000,000
Fixed rate debt fair value	5,800,000,000	5,500,000,000
Variable rate debt carrying amount	854,400,000	752,300,000
Variable rate debt fair value	853,200,000	749,400,000
Redeemable noncontrolling interest	$ 28,263,000	$ 30,849,000	$ 32,205,000	$ 27,150,000
DownREIT limited partnerships consolidated by company (in partnerships) | partnership	18	18
Communities within DownREIT partnerships (in communities) | community	10	9
Number of consolidated co-investments that now meet the definition of a VIE | investment	4	5
Assets related to variable interest entities net of intercompany eliminations	$ 970,600,000	$ 893,000,000.0
Liabilities related to variable interest entities net of intercompany eliminations	242,500,000	319,100,000
Noncontrolling interests in VIE	$ 101,200,000	$ 105,100,000
Number of common stock shares per unit basis (in shares) | shares	1
Units of limited partnership interest amount (in shares) | shares	892,572	914,505
Redemption value of variable interest entities	$ 233,600,000	$ 261,000,000.0
Redeemable noncontrolling interest, units of limited partners' interests in DownREIT VIEs	8,900,000	9,000,000.0
Noncontrolling interest in limited partnerships	$ 96,600,000	$ 96,900,000
Number of company settled lawsuits | lawsuit		2
Construction defects at communities | community		2	1
Gain (loss) from litigation settlement		$ 42,500,000	$ 7,700,000
Minimum
Real Estate Properties [Line Items]
Apartment lease term	9 months
Maximum
Real Estate Properties [Line Items]
Apartment lease term	12 months