Financial Instruments and Derivatives - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		9 Months Ended
		Sep. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Preferred Stock, Redemption Price Per Share	[1]	$ 50
Preferred Stock, Redemption Date		Oct. 01, 2026
Variable Rate Commercial Paper Program [Member]
Derivative [Line Items]
Debt instruments Carrying Value		$ 490.0	$ 495.0
Variable Rate Commercial Paper Program		$ 490.0	495.0
Variable Rate Commercial Paper Program [Member] | Maximum [Member]
Derivative [Line Items]
Debt Renewal Period		30 days
Designated as Hedging Instrument
Derivative [Line Items]
Realized losses associated with terminated interest rate swaps that were designated as cash flow hedging instruments		$ 7.5
Designated as Hedging Instrument | Interest Expense
Derivative [Line Items]
Change in fair value of interest rate derivatives included in AOCI and expected to be reclassified in the next 12 months		1.7
Fair Value, Measurements, Recurring [Member]
Derivative [Line Items]
Embedded Derivative, Fair Value of Embedded Derivative Asset		17.5	31.9
Fixed Rate Debt [Member]
Derivative [Line Items]
Notes Payable Excluding Interest Rate Swaps and Cap Agreements		4,400.0	4,000.0
Notes Payable, Fair Value Disclosure		$ 4,200.0	$ 3,700.0

[1] The redemption price is the price at which the preferred stock is redeemable, at MAA’s option, for cash.