Partners' Capital of MAALP - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Schedule Of Capital Structure [Line Items]
Operating partnership units outstanding	118,538,877	118,423,860
General Partners' Capital Account, Units Outstanding	114,919,922	114,365,203
Limited Partners' Capital Account, Units Outstanding	3,618,955	4,058,657
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 [Member]
Schedule Of Capital Structure [Line Items]
Common Shares Issuable Upon Conversion Of Convertible Stock	3,618,955	4,058,657
Limited Partners' Capital Account	$ 609.5	$ 465.4
Redeemable Capital Shares Par Or Stated Value Per Share	$ 168.42	$ 114.67
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	96.90%	96.60%