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Summary of Critical and Significant Accounting Policies - Narrative (Details) | 12 Months Ended |
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Dec. 31, 2022 USD ($) property investment community partnership shares | Dec. 31, 2021 USD ($) property shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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 | $ 7,400,000 | $ 8,900,000 |  |
Number of properties held-for-sale | property | 0 | 0 |  |
Impairment loss | $ 0 | $ 0 | $ 1,825,000 |
Impairment loss from unconsolidated co-investment | $ 2,100,000 | 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 | $ 200,000 | 800,000 |  |
Proceeds from sale and maturities of marketable securities | 71,200,000 | 16,600,000 | 113,500,000 |
Marketable securities, realized gain (loss) | 12,400,000 | 3,400,000 | 2,100,000 |
Unrealized gain (loss) on equity securities recognized through income | (57,983,000) | 33,104,000 | 12,515,000 |
Capitalized internal costs related to development and redevelopment projects | 20,400,000 | 23,600,000 | 31,400,000 |
Fixed rate debt carrying amount | 5,700,000,000 | 5,700,000,000 |  |
Fixed rate debt fair value | 5,200,000,000 | 6,000,000,000 |  |
Variable rate debt carrying amount | 274,200,000 | 564,900,000 |  |
Variable rate debt fair value | $ 273,200,000 | 561,700,000 |  |
DownREIT limited partnerships consolidated by company (in partnerships) | partnership | 18 |  |  |
Communities within DownREIT partnerships (in communities) | community | 9 |  |  |
Number of consolidated co-investments that now meet the definition of a VIE | investment | 6 |  |  |
Assets related to variable interest entities net of intercompany eliminations | $ 939,400,000 | 909,300,000 |  |
Liabilities related to variable interest entities net of intercompany eliminations | 324,300,000 | 320,100,000 |  |
Noncontrolling interests in VIE | $ 121,500,000 | $ 122,400,000 |  |
Number of common stock shares per unit basis (in shares) | shares | 1 |  |  |
Units of limited partnership interest amount (in shares) | shares | 938,513 | 978,854 |  |
Redemption value of variable interest entities | $ 198,900,000 | $ 344,800,000 |  |
Redeemable noncontrolling interest | 27,150,000 | 34,666,000 | 32,239,000 | $ 37,410,000
Redeemable noncontrolling interest, units of limited partners' interests in DownREIT VIEs | 9,200,000 | 7,700,000 |  |
Noncontrolling interest in limited partnerships | 97,000,000 | 97,400,000 |  |
Employee retention credit | $ 4,100,000 | $ 4,200,000 | $ 0 |

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