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Net Income Per Common Share and Net Income Per Common Unit - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Convertible units |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 2,256,415 | 2,280,379 | 2,275,327 | 2,266,054
Income allocated to convertible OP Units | $ 5.8 | $ 4.2 | $ 20.8 | $ 17.1
Stock options |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 250,512 | 197,474 | 253,903 | 327,048
Stock options | Essex Portfolio, L.P. |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 250,512 | 197,474 | 253,903 | 327,048

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