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Financial Instruments and Derivatives - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Derivative [Line Items] |  |  |
Preferred Stock, Redemption Price Per Share | [1] | $ 50.00 |
Preferred Stock, Redemption Date |  | Oct. 01, 2026 |
Designated as Hedging Instrument | Interest Expense |  |  |
Derivative [Line Items] |  |  |
Realized losses associated with terminated interest rate swaps that were designated as cash flow hedging instruments |  | $ 11.7 |
Change in fair value of interest rate derivatives included in AOCI and expected to be reclassified in the next 12 months |  | 1.1 |
Fair Value, Measurements, Recurring [Member] |  |  |
Derivative [Line Items] |  |  |
Embedded Derivative, Fair Value of Embedded Derivative Asset |  | $ 50.5 | $ 39.0
Conventional Variable Rate Debt [Member] | Maximum [Member] |  |  |
Derivative [Line Items] |  |  |
Debt Renewal Period |  | 30 days |
Fixed Rate Debt [Member] |  |  |
Derivative [Line Items] |  |  |
Notes Payable Excluding Interest Rate Swaps and Cap Agreements |  | $ 4,500.0 | 4,400.0
Notes Payable, Fair Value Disclosure |  | 4,900.0 | 4,900.0
Floating Rate Debt [Member] |  |  |
Derivative [Line Items] |  |  |
Notes Payable Excluding Interest Rate Swaps and Cap Agreements |  | 25.0 | 172.0
Notes Payable, Fair Value Disclosure |  | $ 25.0 | $ 172.0
[1] | The redemption price is the price at which the preferred stock is redeemable, at MAA’s option, for cash.

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