Leases - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) Property CorporateOfficeLease	Dec. 31, 2020 USD ($)	Dec. 31, 2019
Operating Leased Assets [Line Items]
Increase (decrease) in lease liabilities	$ 11.3
Increase (decrease) in ROU assets	$ 11.3
Corporate Office Leases [Member]
Operating Leased Assets [Line Items]
Number of operating leases | CorporateOfficeLease	8
Ground Leases [Member]
Operating Leased Assets [Line Items]
Number of operating properties | Property	15
COVID-19 [Member]
Operating Leased Assets [Line Items]
Write-off of straight-line rent receivables	$ 0.8	$ 13.2
Decrease in rental revenues	$ 7.5	$ 7.3
Maximum [Member] | Corporate Office Leases [Member]
Operating Leased Assets [Line Items]
Lease expiration dates (inclusive of applicable extension options)	2042
Maximum [Member] | Ground Leases [Member]
Operating Leased Assets [Line Items]
Operating lease expiration year	2118
Minimum [Member] | Corporate Office Leases [Member]
Operating Leased Assets [Line Items]
Lease expiration dates (inclusive of applicable extension options)	2022
Minimum [Member] | Ground Leases [Member]
Operating Leased Assets [Line Items]
Operating lease expiration year	2042
Residential Apartment Leases [Member]
Operating Leased Assets [Line Items]
Percentage of rental income	97.00%	98.00%	97.00%
Residential Apartment Leases [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Retail leases term	12 months
Non-residential Leases [Member]
Operating Leased Assets [Line Items]
Percentage of rental income	3.00%	2.00%	3.00%
Non-residential Leases [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Retail leases term	10 years
Non-residential Leases [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Retail leases term	5 years