Significant Transactions During the Six Months Ended June 30, 2023 and Subsequent Events (Details) $ / shares in Units, $ in Millions	1 Months Ended					3 Months Ended	6 Months Ended
	Jul. 28, 2023 USD ($)	Jun. 30, 2023 USD ($)	May 31, 2023 USD ($)	Apr. 30, 2023 USD ($) apartment	Mar. 31, 2023 USD ($) apartment	May 31, 2024 USD ($)	Jun. 30, 2023 USD ($) $ / shares shares
Other Commitments [Line Items]
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares							$ 218.88
Secured Debt | Subsequent Event
Other Commitments [Line Items]
Secured loans	$ 298.0
Fixed interest rate term	10 years
Interest rate	5.08%
Unsecured debt
Other Commitments [Line Items]
Secured loans		$ 300.0					$ 300.0
Repayments of unsecured debt			$ 300.0
Unsecured debt | Forecast
Other Commitments [Line Items]
Repayments of unsecured debt						$ 400.0
Preferred Equity Investment Property In Northern California
Other Commitments [Line Items]
Proceeds from dispositions of co-investments				$ 11.2
Preferred Equity Investment Property in Southern California
Other Commitments [Line Items]
Proceeds from dispositions of co-investments		14.7
Early redemption fee		0.3
Stock Repurchase Plan
Other Commitments [Line Items]
Shares repurchased and retired during period (in shares) | shares							437,026
Shares repurchased and retired during period, value							$ 95.7
Purchase authority remaining under stock repurchase plan		302.7					302.7
Stock repurchase plan amount		$ 500.0					$ 500.0
Hacienda at Camarillo Oaks
Other Commitments [Line Items]
Number of units acquired | apartment				73
Payments to acquire real estate				$ 23.1
CBC and The Sweeps
Other Commitments [Line Items]
Number of units acquired | apartment					239
Payments to acquire real estate					$ 91.7
Gain on sale of properties					$ 54.5