Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 7.4	$ 8.6
Cleven Litigation Case [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	54.6
Brown Litigation Case [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 8.4
Apartment Communities [Member]
Loss Contingencies [Line Items]
Lease expiration year	2074
Office Lease [Member]
Loss Contingencies [Line Items]
Lease expiration year	2028