Commitments and Contingencies - Contractual Obligations (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Fashion District Philadelphia
Other Commitments [Line Items]
Unaccrued contractual obligation and other commitments	$ 0.9
Ownership percentage	50.00%
Percentage of contractual obligation	100.00%
Fashion District Philadelphia | Macerich | Corporate Joint Venture
Other Commitments [Line Items]
Unaccrued contractual obligation and other commitments	$ 300.0
Contractual obligation, period after commencement	48 months
Construction in Progress
Other Commitments [Line Items]
Unaccrued contractual obligation and other commitments	$ 4.3