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Partners' Capital of MAALP - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Capital Structure [Line Items]
Operating partnership units outstanding	118,431,384	118,313,567
General Partners' Capital Account, Units Outstanding	114,373,727	114,246,393
Limited Partners' Capital Account, Units Outstanding	4,057,657	4,067,174
Preferred Stock, Shares Outstanding	867,846	867,846
Redeemable Preferred Stock [Member]
Schedule Of Capital Structure [Line Items]
Preferred Stock, Shares Outstanding	867,846
Noncontrolling Interest
Schedule Of Capital Structure [Line Items]
Common Shares Issuable Upon Conversion Of Convertible Stock	4,057,657	4,067,174
Limited Partners' Capital Account	$ 514.1	$ 536.3
Redeemable Capital Shares Par Or Stated Value Per Share	$ 126.69	$ 131.86
M A A L P
Schedule Of Capital Structure [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	96.60%	96.60%

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The number of general partner units outstanding.

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-Publisher FASB
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-SubTopic 10
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 272
-SubTopic 10
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